Clinical effect of modified anterolateral acromioarthroplasty during arthroscopic rotator cuff repair.

BACKGROUND: This study aimed to compare the clinical effect of modified anterolateral and traditional acromioplasty in arthroscopic rotator cuff repair. METHODS: The clinical data of 92 patients with total rotator cuff tears admitted to the Department of Joint Surgery of Jinhua Central Hospital from January 2016 to December 2019 were retrospectively analyzed. Among them, 42 patients underwent traditional acromioplasty during arthroscopic rotator cuff repair, and 50 underwent modified anterolateral acromioplasty. Patients were evaluated for preoperative and postoperative shoulder function, pain and critical shoulder angle, and incidence of rotator cuff re-tear at 12 months postoperatively. RESULTS: The preoperative general data of patients in the classic and modified anterolateral acromioplasty groups did not differ significantly (P > 0.05) and were comparable. The UCLA, ASES, and Constant shoulder joint scores were significantly improved in both groups. The VAS score was significantly decreased at 12 months postoperative than preoperative, with a statistically significant difference (P ≤ 0.05). Shoulder function and pain scores did not differ significantly between the two groups at 12 months postoperatively (P > 0.05). The CSA did not differ significantly between preoperative and postoperative 12 months in the traditional acromioplasty group (P > 0.05). However, 12 months postoperative CSA in the modified anterolateral acromioplasty group was significantly smaller than the preoperative CSA, with a statistically significant difference (P ≤ 0.05). The rates of rotator cuff re-tears were 16.67% (7/42) and 4% (2/50) in the two groups at 12 months postoperatively, respectively, with statistically significant differences (P ≤ 0.05). CONCLUSIONS: Traditional and modified anterolateral acromioplasty while treating total rotator cuff tears using arthroscopic rotator cuff repair significantly improves shoulder joint function. However, modified anterolateral acromioplasty significantly reduced the CSA value and decreased the incidence of rotator cuff re-tears.

Re-tear after arthroscopic rotator cuff repair can be predicted using deep learning algorithm.

The application of artificial intelligence technology in the medical field has become increasingly prevalent, yet there remains significant room for exploration in its deep implementation. Within the field of orthopedics, which integrates closely with AI due to its extensive data requirements, rotator cuff injuries are a commonly encountered condition in joint motion. One of the most severe complications following rotator cuff repair surgery is the recurrence of tears, which has a significant impact on both patients and healthcare professionals. To address this issue, we utilized the innovative EV-GCN algorithm to train a predictive model. We collected medical records of 1,631 patients who underwent rotator cuff repair surgery at a single center over a span of 5 years. In the end, our model successfully predicted postoperative re-tear before the surgery using 62 preoperative variables with an accuracy of 96.93%, and achieved an accuracy of 79.55% on an independent external dataset of 518 cases from other centers. This model outperforms human doctors in predicting outcomes with high accuracy. Through this methodology and research, our aim is to utilize preoperative prediction models to assist in making informed medical decisions during and after surgery, leading to improved treatment effectiveness. This research method and strategy can be applied to other medical fields, and the research findings can assist in making healthcare decisions.

Arthroscopic superior capsular reconstruction with dermal allograft for primary and recurrent rotator cuff tears.

Background: The aim of this study was to compare the clinical outcomes and retear rate of arthroscopic superior capsular reconstruction (SCR) with dermal allograft following structural failure of a previous rotator cuff repair, with a cohort of primary SCRs. Methods: This was a retrospective comparative study with a study group comprising 22 patients who were followed up at a minimum of 24 (mean, 41; range, 27-65) months after SCR with dermal allograft performed for structural failure of a previous rotator cuff repair. The control group included 13 patients who previously underwent a primary SCR using dermal allograft and were followed up for 24 months. Clinical outcome measures comprised range of motion, the American Shoulder and Elbow Surgeons score, and the Western Ontario Rotator Cuff (WORC) Index. Radiological outcomes included the acromiohumeral interval and graft integrity on magnetic resonance imaging at one year. Logistic regression was used to determine whether SCR being undertaken as either a primary or revision procedure influenced functional outcomes or retear rate. Results: The mean age at the time of surgery was 58 (range, 39-74) years for the study group and 60 (range, 48-70) years for the control group. Forward flexion improved from a mean of 117° (range, 7°-180°) preoperatively to 140° (range, 45°-170°) postoperatively (P = .11), and external rotation increased from a mean of 31° (range, 0°-70°) preoperatively to 36° (range, 0°-60°) postoperatively (P = .23). The American Shoulder and Elbow Surgeons score improved (P = 0) from a mean of 38 (range, 12-68) to 73 (range, 17-95), and the WORC Index improved (P = 0) from a mean of 29 (range, 7-58) to 59 (range, 30-97). Following SCR, there was no significant change in the acromiohumeral interval. The graft was intact in 42% of cases on magnetic resonance imaging and none of the retears underwent further surgery. Compared to revision SCR, primary SCR resulted in a significant improvement in forward flexion (P = .001), external rotation (P = 0), and WORC Index (P = .019). Logistic regression demonstrated that SCR performed as a revision procedure was associated with a higher retear rate (P = .006) and worse forward flexion (P = .009) and external rotation (P = .008). Conclusion: SCR using human dermal allograft following structural failure of a previous rotator cuff repair can lead to an improvement in clinical outcomes but the results are inferior to primary procedures.

Biceps-based 3-layer reconstruction of the irreparable rotator cuff: a technical note on biceps tendon as a common local graft for in-situ superior capsular reconstruction, partial cuff repair, and middle trapezius tendon transfer.

BACKGROUND: For irreparable rotator cuff tears, 3-layer tendon reconstruction (in which in-situ superior capsular reconstruction-reinforced partial rotator cuff repair was augmented with hamstring-sheet-lengthened middle trapezius tendon transfer) was recently reported to achieve satisfactory postoperative outcomes. To avoid hamstring graft-related drawbacks, the current note describes a technical modification of that reconstruct; wherein long head of biceps tendon is used as a cornerstone structure for simultaneously reconstructing the superior capsule; lengthening the transferred middle trapezius tendon; and augmenting the partially-repaired rotator cuff. METHODS: Via sub-pectoral approach, long head of biceps tendon is distally-tenotomized. Through McKenzie approach, proximal stump of the tenotomized long head of biceps is retrieved to the sub-acromial space where double-row biceps tenodesis (into a trough at the greater tuberosity) is performed for reconstructing the superior capsule. Next, postero-superior rotator cuff is partially repaired, and side-to-side sutured to the reconstructed capsule. Through a 7-8-cm skin incision over the medial scapular spine, middle trapezius tendon is released. Portion of long head of biceps tendon distal to the tenodesis site is retrieved via a sub-trapezius/sub-acromial corridor to the scapular wound where it is re-attached to the released middle trapezius tendon. RESULTS: Use of long head of biceps tendon as a common local graft (for simultaneously reconstructing the superior capsule, lengthening the transferred middle trapezius tendon, and augmenting the partially-repaired rotator cuff) is technically feasible provided that the harvested tendon stump is at least 10 cm in length. CONCLUSION: While avoiding hamstring graft-related complications, the currently-reported biceps-based 3-layer rotator cuff tendon reconstruction might offer the advantages of reproducibility, safety, simplicity and quickness; however, it should be validated via further studies. Trial registration The present study was approved by the Institutional Committee of Scientific Research and Ethics (3-2023Orth10-1).

Modifiable and Nonmodifiable Risk Factors Associated with the Development of Recurrent Rotator Cuff Tears.

Nonoperative and operative strategies exist to manage rotator cuff pathology. Although surgical repair is successful for most patients, others may experience retear or nonhealing of the rotator cuff. Several modifiable and nonmodifiable risk factors are associated with an increased retear rate. The literature shows consistency and agreement regarding many of these risk factors, most notably, patient age, tear size, and rotator cuff muscular atrophy, whereas others remain controversial. It is important that shoulder surgeons are familiar with modifiable and nonmodifiable risk factors associated with retear, to better advise patients and optimize their chances of success following rotator cuff repair surgery.

Effect of arthroscopic subacromial decompression during arthroscopic repair of small to medium-sized rotator cuff tears.

Background: Although arthroscopic subacromial decompression (ASD) is a commonly used procedure during arthroscopic rotator cuff repair (ARCR), the effect of ASD on the clinical outcomes for ARCR is controversial. The purpose of this study was to compare the clinical outcomes of ARCR with or without ASD. Methods: Patients (n = 315 with 320 shoulders) who underwent ARCR for small to medium-sized rotator cuff tears were followed for at least 24 months. ARCR was performed with ASD (180 shoulders, group A) or without ASD (140 shoulders, group N). There were no significant differences in patient demographics, including mean age and mean follow-up time. Rotator cuff repair was performed using the suture-bridge technique in all shoulders, and all patients were treated using the same rehabilitation protocol after surgery. University of California at Los Angeles score, Constant score, re-tear rates, revision surgery rates, and operating time were compared between groups. Re-tear was defined as Sugaya classification Types 4 and 5 using postoperative magnetic resonance imaging at more than 12 months. Results: There was no statistically significant difference in clinical outcomes before and after ARCR between groups. However, the University of California at Los Angeles scores and Constant scores significantly improved in both groups after surgery (P < .001). Furthermore, there was no major difference in the re-tear rates between groups A (7/180 shoulders, 3.9%) and N (11/140 shoulders, 7.9%) (P = .146). Revision surgeries were performed on 3/180 shoulders (1.7%) in group A (due to postoperative deep infection in one shoulder and revision ARCR for re-tear in two shoulders). No revisions surgeries were needed in group N patients (P = .259). The mean surgical time for group A was 62.0 ± 27.0 minutes (29-138 min.) and 52.4 ± 26.1 minutes (17-124 min.) for group N (P = .007). Conclusion: These results suggest that ASD has a limited effect on clinical outcomes of ARCR for small to medium-sized rotator cuff tears.

Bone marrow stimulation in arthroscopic rotator cuff repair is a cost-effective and straightforward technique to reduce retear rates: A systematic review and meta-analysis.

Background: Bone marrow stimulation (BMS) has been considered a well-established method for treating knee and ankle osteochondral lesions. Some studies have also shown that BMS can promote healing of the repaired tendon and enhance biomechanical properties during rotator cuff repair. Our purpose was to compare the clinical outcomes of arthroscopic repair rotator cuff (ARCR) with and without BMS. Methods: A systematic review with meta-analysis was performed according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA). PubMed, Embase, Web of Science, Google scholar, ScienceDirect, and the Cochrane Library were searched from inception to March 20, 2022. Data on retear rates, shoulder functional outcomes, visual analog score and range of motion were pooled and analyzed. Dichotomous variables were presented as odds ratios (OR), and continuous variables were presented as mean differences (MD). Meta-analyses were conducted with Review Manager 5.3. Results: Eight studies involving 674 patients were included, with mean follow-up period ranging from 12 to 36.8 months. Compared to ARCR alone, the intraoperative combination of the BMS resulted in lower retear rates (P < 0.0001), but showed similar results in Constant score (P = 0.10), University of California at Los Angeles (UCLA) score (P = 0.57), American Shoulder and Elbow Surgeons (ASES) score (P = 0.23), Disabilities of the Arm, Shoulder and Hand (DASH) score (P = 0.31), VAS (visual analog score) score (P = 0.34), and range of motion (ROM) (forward flexion, P = 0.42; external rotation, P = 0.21). After sensitivity analyses and subgroup analyses, no significant changes in statistical results were observed. Conclusion: Compared to ARCR alone, the combination of intraoperative BMS can significantly reduce the retear rates, but showed similar short-term results in functional outcomes, ROM and pain. Better clinical outcomes are anticipated in the BMS group by improving structural integrity during long-term follow-up. Currently, BMS may be a viable option in ARCR based on its straightforward and cost-effective advantages. Systematic Review Registration: https://www.crd.york.ac.uk/prospero/, identifier: CRD42022323379.

Re-Tear Rates Following Rotator Cuff Repair Surgery.

Aim Re-tears following rotator cuff repair surgery are a common occurrence. Previous studies have identified several factors that have been shown to increase the risk of re-tears. The purpose of this study was to evaluate the rate of re-tear following primary rotator cuff repair and to identify the factors that may contribute to this rate. Method The authors performed a retrospective review, looking at rotator cuff repair surgeries performed between May 2017 and July 2019 performed in a hospital by three specialist surgeons. All methods of repair were included. All patients' medical data, including imaging and operation records, were reviewed. Results A total of 148 patients were identified. Ninety-three males and 55 females with a mean age of 58 years (range 33-79 years). Thirty-four patients (23%) had post-operative imaging with either magnetic resonance imaging or ultrasound, where it was found that 20 (14%) had a confirmed re-tear. Of these patients, nine went on to have further repair surgery. The average age of the re-tear patients was 59 (age range 39-73) and 55% were female. The majority of the re-tears were from chronic rotator cuff injuries. This paper did not identify any correlation between smoking status or diabetes mellitus and re-tear rates. Conclusions This study indicates that re-tear after rotator cuff repair surgery is a common complication. The majority of studies find increasing age to be the biggest risk factor; however, this was not the case in our study which found females in their 50s to have the highest rate of re-tear. Additional research is required to understand what factors can contribute towards rotator cuff re-rupture rates.

Work-related outcomes of revision rotator cuff repair for patients receiving workers' compensation.

BACKGROUND: Workers' compensation (WC) patients are susceptible to poorer outcomes following primary rotator cuff repair (RCR). Failure of structural healing can explain some poor results, and outcomes of revision RCR in this population are unknown. METHODS: A retrospective review was performed of individuals receiving WC who underwent arthroscopic revision RCR with or without dermal allograft augmentation at a single institution between January 2010 and April 2021. Preoperative magnetic resonance imaging (MRI) scans were assessed for rotator cuff tear characteristics, Sugaya classification, and Goutallier grade. Postoperative imaging was not routinely obtained unless for continued symptoms or reinjury. Primary outcome measures included return-to-work status, reoperation, American Shoulder and Elbow Surgeons Standardized Shoulder Assessment Form (ASES), and Single Assessment Numeric Evaluation (SANE) scores. RESULTS: Twenty-seven shoulders (25 patients) were included. The population was 84% male, with a mean age of 54 years; 67% were manual laborers, 11% sedentary workers, and 22% with a mixed profession. Average follow-up was 35.4 months. Fifteen patients (56%) returned to work at full-duty status. Six (22%) returned to work with permanent restrictions. Six (22%) were unable to return to work in any capacity. Thirty percent of all patients and 35% of manual laborers changed occupation following revision RCR. Mean time to return to work was 6.7 months. Overall, symptomatic rotator cuff retear was found in 13 patients (48%). Reoperation rate after revision RCR was 37% (10 cases). Among patients who did not undergo reoperation, mean ASES scores improved from 37.8 to 69.4 at final follow-up (P < .001). Mean SANE scores only improved marginally from 51.6 to 57.0 (P = .61). No statistically significant correlation was found between preoperative MRI findings and outcome measures. CONCLUSION: Workers' compensation patients demonstrated fair improvements in outcome scores after revision RCR. Although some patients are able to return to full duty, nearly half were either unable to return or returned with permanent restrictions. These data are helpful for surgeons when counseling patients about expectations and return to work after revision RCR in this challenging population.

An evaluation of shear wave elastographic characteristics of the supraspinatus tendon after rotator cuff repair.

BACKGROUND: The main complication of rotator cuff repair is retear, which is most common in older patients and patients with greater tear sizes. However, it is unknown why these factors are associated with increased rates of retear. The aim of this study was to determine whether the factors associated with rotator cuff retear (age, tear size, sex, history of trauma, and duration of symptoms) are also associated with decreased mechanical stiffness of the supraspinatus tendon after repair, as assessed by shear wave elastography. METHODS: This was a prospective study of 50 patients undergoing primary rotator cuff repair. A sonographer conducted shear wave elastography ultrasound in all patients at 1, 6, 12, 26, and 52 weeks after repair. The shear wave velocity of the supraspinatus tendon was measured at the tendon-bone interface, 3 mm medial to the interface, and 6 mm medial to the interface. A multiple linear regression analysis was performed with calculation of Cohen F2 values to determine the factors that independently affected supraspinatus tendon stiffness postoperatively. RESULTS: For every decade increase in age, the shear wave velocity of the supraspinatus tendon decreased by 0.5 m/s (P = .004). Greater tear size correlated with reduced supraspinatus shear wave velocity (P < .03 at 6 weeks). Male patients had greater supraspinatus tendon stiffness than female patients (8.2 m/s vs. 6.9 m/s, P = .04). Tendons in patients with a history of trauma were approximately 16% stiffer postoperatively than those in patients with no trauma history (P < .001). Duration of symptoms had no impact on the mechanical stiffness of the supraspinatus tendon. CONCLUSION: Older age, larger tear size, female sex, and nontraumatic tear causation were independently associated with reduced shear wave velocity of the supraspinatus tendon postoperatively. The findings of our study correlate with the results of cohort studies assessing the influence of these variables on rotator cuff retear rates, suggesting that the mechanical stiffness of the supraspinatus tendon, as assessed by shear wave elastography, may have an important association with a successful repair.

Rates of medial and lateral row failure and risk factors for Re-tear in arthroscopic double row rotator cuff repair.

A common postoperative complication after rotator cuff repair is re-tear requiring a secondary procedure. Double row and trans-osseous equivalent repair techniques have become increasingly popular in recent years, however repair failure remains a relatively common complication after primary rotator cuff repair. A retrospective observational study of 389 consecutive patients undergoing arthroscopic double-row rotator cuff repair from February 1, 2014 to March 31, 2020 was conducted. Univariate and multivariate statistics were used to assess differences in demographics, comorbidities, and tear characteristics between patients who experienced re-tear and those who did not. Repair failures were confirmed by plain MRI or intraoperatively during repeat surgical treatment. A subgroup analysis of patients who experienced re-tear due to medial row failure was conducted. The overall re-tear rate was 8.2% (32 patients). Six patients (1.5%) experienced medial row failure, while 26 patients (6.7%) experienced lateral row failure. The average time to re-tear was 279.3 ± 291.2 days. On multivariate analysis, patients with Goutallier Classification ≥3 (OR: 4.274, p = 0.046) and 3 anchor repair (OR: 5.387, p = 0.027) were at significantly increased risk for any re-tear after controlling for other tear characteristics. No statistically significant independent risk factors for medial row failure were identified after controlling for confounding variables. Goutallier classification greater than 3 and a primary repair with 3 anchors are significant risk factors for re-tear after double row rotator cuff repair, however they are not associated with increased occurrence of medial row failure. Further evaluation of risk factors for medial row failure is required to avoid this rare but serious re-tear pattern.

Augmentation of Arthroscopic Rotator Cuff Repair: Biologics and Grafts.

Arthroscopic augmentation of massive and irreparable rotator cuff tears proves to be a valid and evidence-based treatment option to maximize healing and patient outcomes following rotator cuff repair. Integration of acellular dermal allografts as augment or interposition grafts demonstrates definitive benefit in patients with high risk of retear or individuals with severely retracted tears, respectively. Furthermore, these allografts have demonstrated benefit when used for superior capsular repair for chronic, atrophied tears in young, active patients who do not want to proceed with a reverse total shoulder replacement.

Predictors of infraspinatus muscle degeneration in individuals with an isolated supraspinatus tendon tear.

OBJECTIVE: Determine the demographic and clinical factors that predict infraspinatus muscle degeneration in individuals with an isolated supraspinatus tendon tear. MATERIALS AND METHODS: A retrospective analysis was performed using the medical records of patients who had a shoulder MRI interpreted by 1 of 3 fellowship-trained musculoskeletal radiologists since the implementation of a standardized MRI 3 T protocol within our healthcare system. Demographic (e.g., age, sex) and clinical data (e.g., tear size, muscle degeneration, co-morbidities) were collected. Patients with an isolated supraspinatus tendon tear (n = 121) were assigned to one of two groups based on whether any infraspinatus muscle degeneration was present. Logistic regression was used to assess the univariate relationships between infraspinatus muscle degeneration and patient and clinical data, while least absolute shrinkage and selector operator (LASSO) logistic regression was used to assess the multivariable relationship. RESULTS: Of the patients with an isolated supraspinatus tendon tear, 16.5% had evidence of infraspinatus muscle degeneration. The presence of infraspinatus muscle degeneration was independently associated with cardiovascular disease (P = 0.01), supraspinatus muscle degeneration (P < 0.01), and subscapularis muscle degeneration (P = 0.01). When the multivariable relationship is assessed, supraspinatus muscle degeneration emerged as the only variable of significant importance for detecting infraspinatus muscle degeneration (specificity: 87.1%, sensitivity: 80.0%). CONCLUSION: Infraspinatus muscle degeneration is not uncommon in individuals with an isolated supraspinatus tear and is most associated with concomitant supraspinatus muscle degeneration. These findings highlight the need for clinicians to specifically assess the status of each rotator cuff muscle, even when the tendon itself is intact.

Arthroscopic revision rotator cuff repair of large and massive retears using an interpositional bridging dermal allograft.

Background: The purpose of this study was to report the clinical outcomes and retear rate following arthroscopic interpositional bridging dermal allograft for revision rotator cuff repair of large and massive retears. Methods: Twenty-three patients were retrospectively reviewed at a minimum follow-up of 24 (mean, 47; range, 24-77) months after revision rotator cuff repair using an interpositional bridging dermal allograft. There were 17 males and 6 females with a mean age of 56 (range, 40-74) years. Clinical outcomes were assessed using range of motion, the American Shoulder and Elbow Surgeons score and Western Ontario Rotator Cuff Index. Graft integrity was assessed at 12-months using magnetic resonance imaging. Results: The interval between the primary rotator cuff repair and interpositional bridging graft was a mean of 82 (range, 7-192) months. Forward flexion improved from a mean of 145° (range, 60-180°) preoperatively to 152° (range, 135-170°) postoperatively (P = .3561). There was a decrease in external rotation from a mean of 50° (range, 20-80°) preoperatively to 37° (range, 0-45°) postoperatively (P = .0021). The American Shoulder and Elbow Surgeons score improved (P = .0196) from a mean of 50 (range, 10-88) to 69 (range, 22-97), and the Western Ontario Rotator Cuff index improved (P = .0008) from a mean of 34 (range, 3-90) to 57 (range, 14-93). The graft was intact in 39% of patients. No patients underwent further surgery. Conclusion: Interpositional bridging grafting for revision rotator cuff repair of large and massive retears leads to a significant improvement in functional outcome but is associated with a high retear rate.

Retear bigger than preoperative tear size would lead to treatment failure after rotator cuff repair.

BACKGROUND: This study aimed to (1) define treatment failure using the referred patient acceptable symptomatic state (PASS) values for pain visual analog scale (PVAS), American Shoulder and Elbow Surgeons Standardized Shoulder Assessment Form (ASES), and Single Assessment Numeric Evaluation (SANE) clinical scores and (2) identify the factors that lead to patient dissatisfaction after arthroscopic rotator cuff repair (ARCR). METHODS: We analyzed the arthroscopic rotator cuff surgery registry data from January 2015 to December 2016. Patients were followed for ≥2 years and categorized as dissatisfied or satisfied based on our own definition of treatment failure at 2 years postoperatively. For defining treatment failure, the referred PASS values for the PVAS, ASES, and SANE scores were used. Patients who failed to attain the PASS value for the PVAS, ASES, or SANE score were categorized into the dissatisfied group. Pre- and postoperative imaging and basic demographic data were compared between groups. Univariable and multivariable logistic regression analyses were performed to identify the factors affecting patient satisfaction at 2 years after rotator cuff repair. RESULTS: Of 117 patients, 30 (25.6%) were defined as the dissatisfied group (mean follow-up period, 37.5 months). Seventeen patients (14.5%) had confirmed retear on follow-up magnetic resonance imaging. In the univariate analysis, sex significantly differed between the groups (female, satisfied vs. dissatisfied groups: 39 [44.8%] vs. 22 [73.3%]; P = .010). Retear alone did not affect patient satisfaction in the univariate analysis (P = .11). Progressed retear size featured a significantly higher risk of patient dissatisfaction (P = .024; odds ratio 6.430, 95% confidence interval 1.270-32.541) in the multivariable analysis using symptom duration, sex, preoperative ASES score, preoperative tear size, retear, and progressed retear size as variables. Moreover, female sex had an increased odds for dissatisfaction (odds ratio 4.646, 95% confidence interval 1.590-13.578; P = .005). CONCLUSION: Two years after ARCR, most patients (74.4%) reported satisfaction with their outcomes. However, satisfaction levels can be altered by female sex or progressed retear size compared with the preoperative state.

Preoperative rotator cuff tendon integrity, tear size, and muscle atrophy and fatty infiltration are associated with structural outcomes of arthroscopic revision rotator cuff repair.

PURPOSE: A few studies have focused on factors predisposing to retear after arthroscopic revision rotator cuff repair (ARRCR). This study aimed to retrospectively evaluate (1) the structural and clinical outcomes of ARRCR and (2) pre- and intraoperative factors affecting the integrity of the rotator cuff (RC) tendon by focusing on preoperative RC tendon integrity, tear size, muscle hypotrophy and fatty infiltration. METHODS: Patients who underwent ARRCR between 2006 and 2016 were reviewed. Preoperative variables included demographic data, RC tendon integrity, tear size, and muscle hypotrophy and fatty infiltration on preoperative magnetic resonance imaging (MRI). Intraoperative variables included repair technique and completeness of repair. The visual analog scale for pain (PVAS), functional VAS (FVAS), American Shoulder and Elbow Surgeons scores, and shoulder range of motion (ROM) were assessed. Postoperative tendon integrity was evaluated using over 6-month follow-up MRI. Patients were classified into groups A (healed) and B (retear), and their variables were compared. RESULTS: Overall 65 patients with a mean follow-up of 49.5 ± 30.2 (range, 24.0-148.9) months were analyzed. Fifty-six of 65 (86.2%) patients underwent MRI at 9.1 ± 9.7 (range, 4.4-40.2) months after ARRCR, and 20 of 56 (35.7%) patients (group B) exhibited retear. Group A (36/56, 64.3%) showed higher functional scores and ROMs than group B at the final follow-up, with significant differences in the FVAS scores (Group A versus B: FVAS, 7.6 ± 1.8 versus 6.4 ± 1.9, p = 0.036). Intraoperative variables, including preoperative tendon integrity (p = 0.021), tear size (p = 0.007), supraspinatus and infraspinatus muscle hypotrophy and fatty infiltration (p < 0.001 and p = 0.046), and completeness of repair (p = 0.030), differed significantly between the groups. Multivariate analysis revealed that preoperative supraspinatus muscle hypotrophy and fatty infiltration were independent predisposing factors for retear after ARRCR [odds ratio = 7.5, 95% confidence interval (CI) 1.1-55.8, p = 0.048]. CONCLUSION: The retear was found in 20/56 patients (35.7%) after ARRCR for less than massive rotator cuff tears in this limited study population. Preoperative tendon integrity, tear size, supraspinatus and infraspinatus muscle hypotrophy and fatty infiltration, and completeness of repair was revealed to be associated with tendon integrity following ARRCR. Among them, preoperative supraspinatus muscle atrophy and fatty infiltration were the independent factors for retear after ARRCR, although generalization is limited. LEVEL OF EVIDENCE: IV.

Rotator cuff irreparability or failure of repair (re-tear): technical note on middle trapezius tendon transfer for reproduction of supraspinatus function.

PURPOSE: Based on its close anatomic features and nearly-collinear force vector to those of supraspinatus muscle, the current article describes a technique of middle trapezius tendon transfer for reproduction of supraspinatus function in the context of rotator cuff irreparability/re-tear management. METHODS: While seating the patient in beach-chair position, arthroscopic gleno-humeral examination and sub-acromial decompression are initially performed. Hamstring tendons are harvested and fashioned as flattened quadruple sheet. Through McKenzie approach, infraspinatus and subscapularis tendons are repaired. Then, medial half of middle trapezius insertion tendon is harvested from most medial 5-6 cm of the scapular spine. Through McKenzie approach, hamstring sheet is retrieved via a sub-trapezius/sub-acromial corridor from the scapular wound. Hamstring sheet is re-attached to cuff footprint by double row/suture bridge repair configuration. While retracting the scapula and placing gleno-humeral joint in 45O-abduction/45O-external rotation, hamstring sheet is re-attached to released middle trapezius tendon by non-absorbable sutures. Finally, tendon reconstruct is dynamically-tested in different positions of range of motion. RESULTS: Transfer of medial portion of middle trapezius insertion tendon (lengthened by interposition hamstring tendon sheet) to cuff footprint was technically feasible. Dynamic testing showed smooth sub-acromial gliding motion of the tendon reconstruct. CONCLUSION: For reproduction of supraspinatus function, hamstring tendon augmented-middle trapezius tendon transfer to cuff footprint heralds a number of technical and biomechanical advantages; thus offering a potential effective modality of cuff irreparability/re-tear management in relatively young patients of high functional demands. However, current description should be investigated in further biomechanical and clinical studies to validate its long-term outcomes.

Rotator cuff retear after repair surgery: comparison between experienced and inexperienced surgeons.

BACKGROUND: We hypothesized in this study that the characteristics of retear cases vary according to surgeon volume and that surgical outcomes differ between primary and revision arthroscopic rotator cuff repair (revisional ARCR). METHODS: Surgeons performing more than 12 rotator cuff repairs (RCRs) per year were defined as high-volume surgeons, and those performing fewer than 12 RCRs were considered low-volume surgeons. Of the 47 patients who underwent revisional ARCR at our clinic enrolled in this study, 21 cases were treated by high-volume surgeons and 26 cases by low-volume surgeons. In all cases, the interval between primary surgery and revisional ARCR, degree of "acromial scuffing," number of anchors, RCR technique, retear pattern, fatty infiltration, retear size, operating time, and clinical outcome were recorded. RESULTS: During primary surgery, significantly more lateral anchors (p=0.004) were used, and the rate of use of the double-row repair technique was significantly higher (p<0.001) in the high- versus low-volume surgeon group. Moreover, the "cut-through pattern" was observed significantly more frequently among the cases treated by high- versus low-volume surgeons (p=0.008). The clinical outcomes after revisional ARCR were not different between the two groups. CONCLUSIONS: Double-row repair during primary surgery and the cut-through pattern during revisional ARCR were more frequent in the high- versus low-volume surgeon groups. However, no differences in retear site or size, fatty infiltration grade, or outcomes were observed between the groups.

Retear rates after rotator cuff surgery: a systematic review and meta-analysis.

BACKGROUND: Rotator cuff retear (RCR) is one of the main postoperative drawbacks. RCR can be considered a multifactorial issue, which causes are related either to biological than biomechanical factors. The aim of this study was to define the incidence of RCR after surgical treatment at different time points and to identify the main factors influencing the postoperative rotator cuff (RC) healing. METHODS: A systematic review and meta-analysis were performed following the PRISMA guidelines. A comprehensive search of the literature was carried out in July 2020, using PubMed and Cochrane Library databases. Only level 1 and 2 clinical evidence studies were included. Studies were included if patients with preoperative repairable full-thickness RC tears were treated surgically, and if studies reported postoperative RCR confirmed by imaging diagnostic. The association between timing of retear and follow-up time points were investigated using an inverse-variance method of pooling data. A subgroup meta-analysis was performed using the DerSimonian and Laird method for the estimation of the between-study variance, i.e., τ2. The association between retear rate after surgery and patients' age, preoperative tear size, fatty infiltration, postoperative rehabilitation protocol, surgical techniques, and RC repairs was determined by expressing the effect measure in terms of odds ratio (OR) with 95% confidence interval (CI). The Mantel-Haenszel method with 95% CIs was used. RESULTS: Thirty-one articles were included in this study. The percentage of RCR after surgery was 15% at 3 months follow-up, 21% at 3-6 months follow-up, 16% at 6-12 months follow-up, 21% at 12-24 months follow-up, 16% at follow-up longer than 24 months. The main factors influencing RC healing are both patient-related (i.e., age, larger tear size, fatty infiltration) and not patient-related (i.e., postoperative rehabilitation protocol, surgical techniques, and procedures). CONCLUSIONS: Postoperative RC healing is influenced by patient-related and non-patient-related factors. Further high-level clinical studies are needed to provide highly relevant clinical results.

Footprint preparation with nanofractures in a supraspinatus repair cuts in half the retear rate at 1-year follow-up. A randomized controlled trial.

PURPOSE: To evaluate if adding nanofractures to the footprint of a supraspinatus tear repair would have any effect in the outcomes at one-year follow-up. METHODS: Multicentric, triple-blinded, randomized trial with 12-months follow-up. Subjects with isolated symptomatic reparable supraspinatus tears smaller than 3 cm and without grade 4 fatty infiltration were included. These were randomized to two groups: In the Control group an arthroscopic supraspinatus repair was performed; in the Nanofracture group the footprint was additionally prepared with nanofractures (1 mm wide, 9 mm deep microfractures). Clinical evaluation was done with Constant score, EQ-5D-3L, and Brief Pain Inventory. The primary outcome was the retear rate in MRI at 12-months follow-up. Secondary outcomes were: characteristics of the retear (at the footprint or at the musculotendinous junction) and clinical outcomes. RESULTS: Seventy-one subjects were randomized. Two were lost to follow-up, leaving 69 participants available for assessment at 12-months follow-up (33 in the Control group and 36 in the Nanofracture Group). The Nanofracture group had lower retear rates than the Control group (7/36 [19.4%] vs 14/33 [42.4%], differences significant, p = 0.038). Retear rates at the musculotendinous junction were similar but the Nanofracture group had better tendon healing rates to the bone (34/36 [94.4%] vs. 24/33 [66.71%], p = 0.014). Clinically both groups had significant improvements, but no differences were found between groups. CONCLUSION: Adding nanofractures at the footprint during an isolated supraspinatus repair lowers in half the retear rate at 12-months follow-up. This is due to improved healing at the footprint. LEVEL OF EVIDENCE: Level I.