American Academy of Orthopaedic Surgeons Appropriate Use Criteria for Humeral Component Design During Primary Anatomic Total Shoulder Arthroplasty.

The American Academy of Orthopaedic Surgeons (AAOS) has developed appropriate use criteria (AUC) for humeral component design during primary anatomic total shoulder arthroplasty. Evidence-based information, in conjunction with the clinical expertise of physicians, was used to develop the criteria to determine the appropriateness of various humeral component designs during primary anatomic total shoulder arthroplasty. The AUC for humeral component design during primary anatomic total shoulder arthroplasty w ere derived by identifying clinical indications evident during the clinical decision-making process. These scenarios relied on definitions and general assumptions, mutually agreed on by the writing panel during the development of the scenarios. These definitions and assumptions were necessary to provide consistency in the interpretation of the clinical scenarios among experts rating the scenarios and readers using the final criteria. Writing panel members of this AUC developed patient scenarios using these guiding principles: comprehensive (covers a wide range of patients); mutually exclusive (there should be no overlap between patient scenarios/indications); homogeneous (the final ratings should result in equal application within each of the patient scenarios); and manageable (number of total rating items [ie, number of patient scenarios × number of treatments] should be practical for the rating panel). The target number of total rating items is 1,500. This means that not all patient indications and treatments can be assessed within the AUC. The 144 patient scenarios and three treatments were developed by the writing panel, a group of clinicians who are specialists in this AUC topic. Next, a separate, multidisciplinary, rating panel (made up of specialists and nonspecialists) rated the appropriateness of treatment of each patient scenario using a 9-point scale to designate a treatment as 'appropriate' (median rating, 7 to 9), 'may be appropriate' (median rating, 4 to 6), or 'rarely appropriate' (median rating, 1 to 3).

Tranexamic acid is not associated with decreased infection risk after primary shoulder arthroplasty: a cohort study of 9276 patients.

BACKGROUND: The use of tranexamic acid (TXA) is associated with less blood loss and reduced transfusion risk after shoulder arthroplasty surgery. Recent studies have shown lower odds of postoperative infection after hip or knee arthroplasty with its use. The purpose of this study was to determine whether TXA use reduces the risk of infection after primary elective shoulder arthroplasty. METHODS: A retrospective cohort study was conducted using data from a US integrated health care system's shoulder arthroplasty registry. Patients aged 18 years who underwent primary elective anatomic total shoulder arthroplasty for osteoarthritis or primary reverse shoulder arthroplasty for rotator cuff arthropathy were included (2013-2020). We compared patients who received preoperative intravenous TXA to those who did not receive TXA by assessing the risk for revision due to deep infection within 5 years' follow-up using multivariable Cox proportional hazard regression. Interaction between TXA and diabetes status was analyzed separately. RESULTS: The study sample included 9276 shoulder arthroplasties performed by 153 surgeons at 43 hospitals. The mean age was 70.0 years and 48% were male. The 5-year probability of revision for deep infection was 0.8% and 0.7% for patients with and without TXA, respectively. We failed to observe a difference in infection risk after adjustment for confounders and surgeon differences (hazard ratio [HR] 1.00, 95% confidence interval [CI] 0.56-1.80, P = .998). Further, no differences were observed in patients with (HR 1.64, 95% CI 0.42-6.44, P = .481) or without diabetes (HR 0.79, 95% CI 0.40-1.55, P = .488). CONCLUSION: In a multicenter cohort of more than 9000 primary shoulder arthroplasty procedures, the use of preoperative TXA was not associated with a decrease in the 5-year probability of revision for deep infection.

Procedure Cost Comparison of Outpatient and Inpatient Shoulder Arthroplasty and Lower-Extremity Arthroplasty Within a Managed-Care Organization.

Introduction The authors sought to evaluate cost differences between shoulder arthroplasties and lower-extremity joint replacements in the outpatient and inpatient setting within a large health-maintenance organization. Methods A cross-sectional study of 100 total hip arthroplasties (THA), 100 total knee arthroplasties (TKA), and 100 shoulder arthroplasties (50 anatomical total shoulder arthroplasties and 50 reverse shoulder arthroplasties [RTSA]) was performed at a single regional health care center within an integrated health care maintenance organization. A time-driven activity-based costing methodology was used to obtain total cost of each episode for outpatient (vs) inpatient surgery. Results are presented by procedure type. Results Compared to their respective inpatient procedure, outpatient surgery was less expensive by 20% for RTSA, 22% for total shoulder arthroplasties, 29% for THA, and 30% for TKA. The cost of implants was the highest proportion of cost for all joint procedures across inpatient and outpatient settings, ranging from 28% of the total cost for inpatient THA to 63% of the cost for outpatient RTSA. Discussion Although many factors influence the total cost for arthroplasty surgery, including rate of hospitalization, duration of stay, operative time, complexity of cases, patient factors, equipment, and resource utilization, the implant cost remains the most expensive factor, with hospital bed admission status being the second costliest contribution. Conclusion Outpatient total arthroplasty substantially reduced procedure expenses in a managed-care setting by 20%-30%, although savings for outpatient shoulder arthroplasty was lower than savings for THA or TKA. Implant costs remain the largest portion of shoulder arthroplasty procedure expenses.

What do positive and negative Cutibacterium culture results in periprosthetic shoulder infection mean? A multi-institutional control study.

BACKGROUND: Deep tissue culture specimens obtained at the time of revision shoulder arthroplasty are commonly positive for Cutibacterium. Clinical interpretation of positive cultures can be difficult. This was a multi-institutional study evaluating the accuracy of cultures for Cutibacterium using positive control (PC) and negative control (NC) samples. The relationship between time to culture positivity and strength of culture positivity was also studied. METHODS: Eleven different institutions were each sent 12 blinded samples (10 PC and 2 NC samples). The 10 PC samples included 2 sets of 5 different dilutions of a Cutibacterium isolate from a failed total shoulder arthroplasty with a probable periprosthetic infection. At each institution, the samples were handled as if they were received from the operating room. Specimen growth, time to culture positivity, and strength of culture positivity (based on semiquantitative assessment) were reported. RESULTS: A total of 110 PC samples and 22 NC samples were tested. One hundred percent of specimens at the 4 highest dilutions were positive for Cutibacterium. At the lowest dilution, 91% of samples showed positive findings. Cutibacterium grew in 14% of NC samples. Cutibacterium grew in PC samples at an average of 4.0 ± 1.3 days, and all of these samples showed growth within 7 days. The time to positivity was significantly shorter (P < .001) and the strength of positivity was significantly higher (P < .001) in true-positive cultures compared with false-positive cultures. CONCLUSIONS: This multi-institutional study suggests that different institutions may report highly consistent rates of culture positivity for revision shoulder arthroplasty samples with higher bacterial loads. In contrast, with lower bacterial loads, the results are somewhat less consistent. Clinicians should consider using a shorter time to positivity and a higher strength of positivity as adjuncts in determining whether a tissue culture sample is a true positive.

Management of irreparable massive rotator cuff tears: a systematic review and meta-analysis of patient-reported outcomes, reoperation rates, and treatment response.

BACKGROUND: There is no consensus on the treatment of irreparable massive rotator cuff tears. The goal of this systematic review and meta-analysis was to (1) compare patient-reported outcome scores, (2) define failure and reoperation rates, and (3) quantify the magnitude of patient response across treatment strategies. METHODS: The MEDLINE, Embase, CENTRAL (Cochrane Central Register of Controlled Trials), and Scopus databases were searched for studies including physical therapy and operative treatment of massive rotator cuff tears. The criteria of the Methodological Index for Non-randomized Studies were used to assess study quality. Primary outcome measures were patient-reported outcome scores as well as failure, complication, and reoperation rates. To quantify patient response to treatment, we compared changes in the Constant-Murley score and American Shoulder and Elbow Surgeons (ASES) score with previously reported minimal clinically important difference (MCID) thresholds. RESULTS: No level I or II studies that met the inclusion and exclusion criteria were found. Physical therapy was associated with a 30% failure rate among the included patients, and another 30% went on to undergo surgery. Partial repair was associated with a 45% retear rate and 10% reoperation rate. Only graft interposition was associated with a weighted average change that exceeded the MCID for both the Constant-Murley score and ASES score. Latissimus tendon transfer techniques using humeral bone tunnel fixation were associated with a 77% failure rate. Superior capsular reconstruction with fascia lata autograft was associated with a weighted average change that exceeded the MCID for the ASES score. Reverse arthroplasty was associated with a 10% prosthesis failure rate and 8% reoperation rate. CONCLUSION: There is a lack of high-quality comparative studies to guide treatment recommendations. Compared with surgery, physical therapy is associated with less improvement in perceived functional outcomes and a higher clinical failure rate.

The association between glenoid component design and revision risk in anatomic total shoulder arthroplasty.

INTRODUCTION: Anatomic total shoulder arthroplasty (TSA) is a proven treatment for glenohumeral joint osteoarthritis, with superior results compared with hemiarthroplasty. However, glenoid component loosening remains a problem and is one of the most common causes of failure in TSA. Multiple component designs have been developed in an attempt to reduce loosening rates. The purpose of this study was to evaluate risk of revision after anatomic TSA according to the glenoid component design. METHODS: We conducted a cohort study including patients aged ≥18 years who underwent primary elective TSA for the diagnosis of osteoarthritis between 2010 and 2017. Patients with missing implant information, who received stemless humeral implants, or who received augmented glenoid implants, were excluded. Glenoid component designs used were categorized into 4 mutually exclusive treatment groups: polyethylene central-pegged ingrowth, polyethylene-metal hybrid, polyethylene all-cemented pegged, and polyethylene cemented keeled. Multivariable competing risk regression was used to evaluate the risk of glenoid loosening as a cause-specific revision by the glenoid component design. RESULTS: Of the 5566 TSA included in the final cohort, 39.2% of glenoid implants were polyethylene central-pegged ingrowth, 31.1% were polyethylene-metal hybrid, 26.0% were polyethylene all-cemented pegged, and 3.6% were polyethylene cemented keeled. At 6-year final follow-up, 4.1% of TSA were revised for any cause, and 1.4% for glenoid loosening. Compared with the polyethylene central-pegged ingrowth design, no difference in glenoid loosening revision risk was observed for the polyethylene-metal hybrid design (hazard ratio [HR] = 1.15, 95% confidence interval [CI] = 0.42-3.20). However, both the polyethylene all-cemented pegged (HR = 2.48, 95% CI = 1.08-5.66) and polyethylene cemented keeled (HR = 3.84, 95% CI = 1.13-13.00) designs had higher risks for revision due to glenoid loosening. CONCLUSIONS: We observed glenoid component designs to be associated with differential risks in revision due to glenoid loosening with polyethylene all-cemented pegged glenoids and polyethylene cemented keeled glenoids having higher risks when compared with polyethylene central-pegged ingrowth glenoids. Surgeons may want to consider the glenoid component design when performing anatomic TSA.

Predicting Failure After Primary Arthroscopic Bankart Repair: Analysis of a Statistical Model Using Anatomic Risk Factors.

PURPOSE: The purpose of this study was to establish and analyze a simplified scoring system based on anatomic imaging measurements to predict recurrent instability after primary arthroscopic shoulder capsulolabral repair. METHODS: All patients undergoing primary arthroscopic anterior capsulolabral repair of the shoulder were reviewed. Patients were contacted and charts were reviewed for endpoint of recurrent instability and return to prior level of activity. Predictive variables for recurrent instability studied included age, sex, amount of glenoid bone loss, intact anterior articular arc (IAAA), glenohumeral tracking (off-track), contact sports and overhead sports participation. RESULTS: 540 patients met inclusion criteria and follow-up data with magnetic resonance imaging data were available for 337 shoulders. Average follow-up was 6.2 years(range 3.4-9.3 years). Symptomatic recurrent instability occurred in 102 patients (30.3%) and 68% of contacted patients returned to pre-injury activities. In univariate analysis, age under 21 years, off-track lesions, IAAA <150°, and glenoid bone loss (GBL) of 10% or greater displayed an increased risk of recurrent instability. Multivariable analysis showed these factors remained significant: age <21 (odds ratio [ratio] 2.37), off-track glenoid (OR 2.86), IAAA <150 (OR 3.90), and GBL ≥10% (OR 7.47). A scoring system assigning 1 point each for age and off-track lesions, 2 points for IAAA <150, and 4 points for GBL >10% yielded 79% sensitivity, 75% specificity, 58% positive predictive value, and 89% negative predictive value using a probability value of 20 percent for recurrent instability. CONCLUSION: At mid-term follow-up, recurrent shoulder instability following primary arthroscopic anterior capsulolabral repair was 30% in this series. Younger age, glenoid bone loss of 10% or more, IAAA <150° and off-track glenoid lesion conferred the greatest risk for postoperative instability. We propose a scoring system assigning 1 point for age, 1 point for off-track lesions, 2 points for IAAA <150, and 4 points for GBL >10%. This schema demonstrated moderate accuracy for predicting recurrent instability when using a cutoff threshold score above 2 points for failure. LEVEL OF EVIDENCE: Level III, Retrospective Cohort Study.

Perioperative Clindamycin Use in Penicillin Allergic Patients Is Associated With a Higher Risk of Infection After Shoulder Arthroplasty.

BACKGROUND: This study determines whether infection rates differ between prophylactic antibiotic use for patients with or without penicillin allergy before shoulder arthroplasty surgery. METHODS: Seven thousand one hundred forty primary shoulder arthroplasties operated between 2005 and 2016 were identified. We compared deep surgical site infection risk of patients who received perioperative vancomycin alone (6.2%, N = 444) or clindamycin alone (7.1%, N = 508) for penicillin allergy versus patients who received cefazolin alone without penicillin allergy (86.7%, N = 6,188). RESULTS: Seventy deep infections (1.2% 5-year cumulative incidence) were observed. The most common organism was Cutibacterium acnes (39.4%, N = 27). Compared with patients treated with cefazolin, infection risk was not different for those treated with vancomycin (hazard ratio = 1.17, 95% confidence interval 0.42 to 3.30, P = 0.8), but a higher risk of infection was identified for those treated with clindamycin alone (hazard ratio = 3.45, 95% confidence interval 1.84 to 6.47, P < 0.001). CONCLUSION: A higher risk of postoperative infection is found after prophylactic use of intravenous clindamycin antibiotic after shoulder arthroplasty. Vancomycin is preferred over clindamycin for patients with penicillin allergy. LEVEL OF EVIDENCE: III, retrospective cohort study.

Risk Factors for Mortality and Readmission After Shoulder Hemiarthroplasty for Fracture.

BACKGROUND: Limited information exists regarding mortality and readmission following proximal humerus fracture. This study examines risk factors following hemiarthroplasty for these fractures. METHODS: A retrospective analysis of prospectively collected data on 788 patients treated with hemiarthroplasty for acute proximal humerus fracture from January 2005 to December 2011 was conducted. One-year mortality and 30- and 90-day hospital readmission were evaluated. Patient risk factors included age, race, gender, diabetes, American Society of Anesthesiologists (ASA) score, and body mass index. RESULTS: One-year mortality rate was 5.2%. Patients with ASA ≥3 had 2.37 times (95% confidence interval [CI]: 1.05-5.32) greater mortality risk versus patients with ASA1/2. The 30-day readmission rate was 8.4% and at 90 days was 12.6%. Females had 0.53 risk of readmission versus males (95% CI: 0.29-0.96). Patients with ASA ≥3 had 1.79 (95% CI: 1.04-3.09) risk of 90-day readmission versus patients with ASA1/2; females had 0.52 (95% CI: 0.31-0.85) risk of readmission versus males. Increased age increased all odds ratios. CONCLUSIONS: Readmission rate after hemiarthroplasty for proximal humerus fracture is significant both at 30 and 90 days and is higher in males. Age and ASA ≥3 correlate with this. Diabetes and obesity were not significant risk factors for readmission or mortality.

Operative Management of Acute Triceps Tendon Ruptures: Review of 184 Cases.

BACKGROUND: Distal triceps tendon ruptures are rare. The authors present a series of 184 surgically treated, acute, traumatic triceps tendon avulsions and compare the complications between those treated with anchors (A) versus transosseous (TO) suture repair. HYPOTHESIS: No difference exists in the retear rate between TO and A repairs. Study Designed: Cohort study; Level of evidence, 3. METHODS: All patients who underwent an open primary repair of a traumatic triceps tendon avulsion within 90 days of injury, between 2007 and 2015, were retrospectively reviewed. Surgeries were performed within a multisurgeon (75 surgeons), multicenter (14 centers), community-based integrated health care system. Patient demographic information, type of repair, complications, and time from surgery to release from medical care were recorded. RESULTS: 184 triceps tears in 181 patients met the inclusion criteria. The mean age was 49 years (range, 15-83 years). There were 169 males. The most common mechanisms of injury were fall (56.5%) and weight lifting (19%). Mean time from injury to surgery was 19 days (range, 1-90 days); in 74.5% of cases, surgery was performed in 3 weeks or less. There were 105 TO and 73 A repairs. No significant difference was found between the two groups in the mean age ( P = .18), sex ( P = .51), completeness of tears ( P = .74), tourniquet time ( P = .455), and prevalence of smokers ( P = .64). Significant differences were noted between TO and A repairs in terms of reruptures (6.7% vs 0%, respectively; P = .0244), overall reoperation rate (9.5% vs 1.4%; P = .026), and release from medical care (4.3 vs 3.4 months; P = .0014), but no difference was seen in infection rate (3.8% vs 0%; P = .092). No difference was noted in release from medical care in patients who underwent surgery 3 weeks or less after injury compared with those undergoing surgery more than 3 weeks after injury (3.90 vs 4.09 months, respectively; P = .911). CONCLUSION: Primary repair of triceps ruptures with TO fixation has a significantly higher rerupture rate, higher reoperation rate, and longer release from medical care than does repair with A fixation. Implementation of suture anchors in triceps repairs offers a lower complication rate and earlier release from medical care.

Anterior deltoid reeducation for irreparable rotator cuff tears revisited.

BACKGROUND: A previous study introduced a method of conservative treatment of irreparable rotator cuff tears (RCTs) using a rehabilitation program (anterior deltoid reeducation [ADR]). The purposes of this study were to present our experience with ADR and to compare our results with those of the previous study. METHODS: Thirty consecutive elderly patients with irreparable RCTs were prospectively enrolled and taught how to perform the home-based ADR program for a period of 3 months. Clinical and radiographic evaluations were determined at the first visit. Clinical follow-up was available after 9 and 24 months. Failure of the ADR program was defined as abandonment of the ADR program because of pain and/or a patient's decision to undergo surgery at any time or a less than 20-point improvement in the American Shoulder and Elbow Surgeons score at last follow-up. RESULTS: Of the 30 patients, 9 did not complete the 3-month ADR program because of pain. Of the 21 patients who completed the ADR program, 3 were not satisfied with the outcome and went on to undergo surgery. Eighteen of the 30 patients completed the program and had a follow-up at 24 months. Among these 18 cases, there were significant mean improvements between pre-ADR and follow-up outcome scores among all variables (P < .005). However, 6 of these 18 patients did not have an improvement in the American Shoulder and Elbow Surgeons score by at least 20 points. Overall, the ADR program had a success rate of only 40%. CONCLUSION: A 3-month ADR program had limited success to treat irreparable RCTs. We could not reproduce the high rate of satisfactory results of 82% found in a previous study.

Complications in total shoulder and reverse total shoulder arthroplasty by body mass index.

INTRODUCTION: The purpose of this study was to identify the effects of body mass index (BMI) on long-term outcomes (revision rate, 1-year mortality rate, 3-year surgical site infection rate, and 90-day inpatient all-cause readmission rate) after total shoulder arthroplasty (TSA) and reverse TSA (RTSA). METHODS: A large shoulder arthroplasty registry was used to review outcomes after TSA and RTSA. The registry monitors patient's revision, mortality, infection, and readmission rates. The exposure of interest was the patient's BMI at the time of the surgery, which was stratified by 5 kg/m2 increments. RESULTS: Selected for this study were 4630 patients who underwent TSA and RTSA between 2007 and 2013, of which 3483 (75.2%) were TSA and 1147 (24.8%) were RTSA. The overall combined (TSA and RTSA) revision rate was 1.7%. After adjusting for confounders in the overall models (TSA and RTSA combined), higher BMI was not associated with higher risk of aseptic revision, 1-year mortality, or 3-year deep infection. In TSA-specific models, every 5 kg/m2 increase in BMI was marginally associated with a 16% increase in the likelihood of 90-day readmission. This association was not observed in the RTSA model. In RTSA-specific models, every 5 kg/m2 increase in BMI was marginally associated with higher risk of 3-year deep infection. This association was not observed in the TSA model. CONCLUSION: Shoulder arthroplasty in obese patients is not associated with higher risk of aseptic revision. The BMI has different effects on TSA and RSA. The surgeon should anticipate increased risk of readmission after TSA and infection after RSA.

Yearly Trends in Elective Shoulder Arthroplasty, 2005-2013.

OBJECTIVE: To evaluate the change in incidence rate of shoulder arthroplasty, the utilization of shoulder arthroplasty for specific indications, and the surgeon volume trends associated with these procedures between 2005 and 2013. METHODS: A population-based cohort study was conducted using the more than 7 million members of an integrated health care system in California. Cases of shoulder arthroplasties performed between 2005 and 2013 were identified using a shoulder arthroplasty registry. Annual shoulder arthroplasty incidence rates per 100,000 patients were determined, and adjusted yearly changes in rates were estimated using incidence rate ratios (IRRs). Changes in surgeon volumes by year and number of surgeons performing different procedures were also compared. RESULTS: The incidence of shoulder arthroplasty per 100,000 members increased from 6.1 (95% confidence interval [95% CI] 5.5-6.7) in 2005 to 13.4 (95% CI 12.5-14.2) in 2013. In patients with osteoarthritis, there was increasing utilization of total shoulder arthroplasty (IRR 1.12 [95% CI 1.11-1.14]) and decreasing utilization of hemiarthroplasty (IRR 0.91 [95% CI 0.89-0.94]). For patients with rotator cuff tear arthropathy, there was an increase in utilization of reverse total shoulder arthroplasty (IRR 1.33 [95% CI 1.29-1.37]) but no change in hemiarthroplasty (IRR 0.99 [95% CI 0.92-1.05]). The average surgeon yearly volume increased for total shoulder arthroplasty (P < 0.001) and for reverse total shoulder arthroplasty (P = 0.020). CONCLUSION: Shoulder arthroplasty is being used with greater frequency in this population. Surgeons are performing a greater yearly volume of total shoulder arthroplasty and reverse total shoulder arthroplasty.

Cement technique correlates with tuberosity healing in hemiarthroplasty for proximal humeral fracture.

BACKGROUND: Tuberosity healing correlates with clinical outcomes after hemiarthroplasty for 4-part proximal humeral fractures (4PHFs). We seek to examine variables that affect tuberosity healing. METHODS: This was a retrospective comparative study. At 1 year postoperatively, patients who underwent hemiarthroplasty for 4PHFs were divided into 2 groups: those with anatomically healed tuberosities and those with tuberosity nonunion. The primary variables included time between injury and surgery, prosthesis fenestration, cement mantle classification, and both vertical and horizontal tuberosity reduction. Secondary demographic factors included age, gender, osteoporosis status, diabetes status, and smoking status. RESULTS: There were 84 individuals who met the inclusion criteria: 37 (44%) had anatomically healed tuberosities, and 47 (56%) did not. Individuals with anatomic healing had cement near or under the tuberosities 32% of the time, whereas individuals with nonunion or resorption had cement near the tuberosities 66% of the time (P = .002). There was no association between tuberosity healing and fenestration of the humeral stem (P = .84). Anatomic reduction between tuberosities was associated with healing (P <.001), whereas greater tuberosity-to-head height was not (P = .25). There were no significant differences in age, osteoporosis status, smoking status, diabetes status, or time to surgery between groups. Male patients had nearly double the rate of healing (P = .03). DISCUSSION AND CONCLUSION: The classification and effect of cement technique on tuberosity healing have not previously been described. We suggest limiting cementation to a minimum of 5 mm below the level of the tuberosity fracture. The ideal candidate for hemiarthroplasty for a 4PHF is a male patient with anatomic tuberosity reduction and limited use of cement.

Incidence of symptomatic compressive peripheral neuropathy after shoulder replacement.

BACKGROUND: The incidence of post-operative compressive peripheral neuropathy (CPN) after shoulder arthroplasty is not known. We hypothesized that the likelihood following shoulder arthroplasty would be higher compared to a non-operative cohort. METHODS: Retrospective study compared the incidence of symptomatic CPN after shoulder replacement to a 1:1 age- and gender-matched non-operative control group with shoulder arthritis. Six hundred six consecutive shoulder replacements from a regional shoulder arthroplasty registry were analyzed. This included 319 primary total shoulder arthroplasties (TSR), 168 hemiarthroplasties (HA), 31 humeral resurfacings (HHR), 71 reverse arthroplasties (RTSA), and 17 revision arthroplasties. Diagnosis of post-operative CPN was obtained by documented clinical examination by a physician consistent with CPN based on patient complaints, positive nerve study results, and/or nerve decompression. Age, gender, body mass index, diabetes status, thyroid abnormalities, operative side, and anesthesiology (ASA) score were examined. RESULTS: The surgery group had 15 cases (2.5 %) of post-operative CPN (ten carpal tunnel syndrome, five cubital tunnel syndrome). This included seven TSR, six HA, one revision TSR, and one RTSA. Diagnoses included ten osteoarthritis, four rotator cuff arthropathies, and one chondrolysis. Control group had eight cases (1.3 %) of CPN (seven carpal tunnel syndrome, one cubital tunnel syndrome). In univariate analysis, age, gender, body mass index, ASA score, operative side, thyroid status, and diabetes were not predictors of post-operative CPN. CPN incidence between surgical and control groups was not statistically significant. CONCLUSION: The 1-year incidence rate of new onset clinical post-operative CPN symptoms was 2.5 %. There was no significant difference of CPN rates between surgical and non-operative groups.

The Kaiser Permanente shoulder arthroplasty registry: results from 6,336 primary shoulder arthroplasties.

BACKGROUND AND PURPOSE: Shoulder arthroplasty is being performed in the United States with increasing frequency. We describe the medium-term findings from a large integrated healthcare system shoulder arthroplasty registry. PATIENTS AND METHODS: Shoulder arthroplasty cases registered between January 2005 and June 2013 were included for analysis. The registry included patient characteristics, surgical information, implant data, attrition, and patient outcomes such as surgical site infections, venous thromboembolism, and revision procedures. RESULTS: During the study period, 6,336 primary cases were registered. Median follow-up time for all primaries was 3.3 years; 461 cases were lost to follow-up by ending of health plan membership. Primary cases were predominantly female (56%) and white (81%), with an average age of 70 years. The most common reason for surgery was osteoarthritis in 60% of cases, followed by acute fracture (17%) and rotator cuff tear arthropathy (15%). In elective shoulder arthroplasty procedures, 200 all-cause revisions (4%) were reported, with glenoid wear being the most common reason. INTERPRETATION: Most arthroplasties were elective procedures: over half performed for osteoarthritis. Glenoid wear was the most common reason for revision of primary shoulder arthroplasty in elective cases.

Patient and procedure-specific risk factors for deep infection after primary shoulder arthroplasty.

BACKGROUND: Deep infection after shoulder arthroplasty is a diagnostic and therapeutic challenge. The current literature on this topic is from single institutions or Medicare samples, lacking generalizability to the larger shoulder arthroplasty population. QUESTIONS/PURPOSES: We sought to identify (1) patient-specific risk factors for deep infection, and (2) the pathogen profile after primary shoulder arthroplasty in a large integrated healthcare system. METHODS: A retrospective cohort study was conducted. Of 4528 patients identified, 320 had died and 302 were lost to followup. The remaining 3906 patients had a mean followup of 2.7 years (1 day-7 years). The study endpoint was the diagnosis of deep infection, which was defined as revision surgery for infection supported clinically by more than one of the following criteria: purulent drainage from the deep incision, fever, localized pain or tenderness, a positive deep culture, and/or a diagnosis of deep infection made by the operating surgeon based on intraoperative findings. Risk factors evaluated included age, sex, race, BMI, diabetes status, American Society for Anesthesiologists (ASA) score, traumatic versus elective procedure, and type of surgical implant. For patients with deep infections, we reviewed the surgical notes and microbiology records for the pathogen profile. Multivariable Cox regression models were used to evaluate the association of risk factors and deep infection. Adjusted hazard ratios and 95% CI are presented. RESULTS: With every 1-year increase in age, a 5% (95% CI, 2%-8%) lower risk of infection was observed. Male patients had a risk of infection of 2.59 times (95% CI, 1.27-5.31) greater than female patients. Patients undergoing primary reverse total shoulder arthroplasty had a 6.11 times (95% CI, 2.65-14.07) greater risk of infection compared with patients having primary unconstrained total shoulder arthroplasty. Patients having traumatic arthroplasties were 2.98 times (95% CI, 1.15-7.74) more likely to have an infection develop than patients having elective arthroplasties. BMI, race, ASA score, and diabetes status were not associated with infection risk (all p > 0.05). Propionibacterium acnes was the most commonly cultured organism, accounting for 31% of isolates. CONCLUSIONS: Younger, male patients are at greater risk for deep infection after primary shoulder arthroplasty. Reverse total shoulder arthroplasty and traumatic shoulder arthroplasties also carry a greater risk for infection. Propionibacterium acnes was the most prevalent pathogen causing infection in our primary shoulder arthroplasty population. LEVEL OF EVIDENCE: Level II, prognostic study. See the Instructions for Authors for a complete description of levels of evidence.

The effect of surgeon and hospital volume on shoulder arthroplasty perioperative quality metrics.

BACKGROUND: There has been a significant increase in both the incidence of shoulder arthroplasty and the number of surgeons performing these procedures. Literature regarding the relationship between surgeon or hospital volume and the performance of modern shoulder arthroplasty is limited. This study examines the effect of surgeon or hospital shoulder arthroplasty volume on perioperative metrics related to shoulder hemiarthroplasty, total shoulder arthroplasty, and reverse shoulder arthroplasty. Blood loss, length of stay, and operative time were the main endpoints analyzed. METHODS: Prospective data were analyzed from a multicenter shoulder arthroplasty registry; 1176 primary shoulder arthroplasty cases were analyzed. Correlation and analysis of covariance were used to examine the association between surgeon and hospital volume and perioperative metrics adjusting for age, sex, and body mass index. RESULTS: Surgeon volume is inversely correlated with length of stay for hemiarthroplasty and total shoulder arthroplasty and with blood loss and operative time for all 3 procedures. Hospital volume is inversely correlated with length of stay for hemiarthroplasty, with blood loss for total and reverse shoulder arthroplasty, and with operative time for all 3 procedures. High-volume surgeons performed shoulder arthroplasty 30 to 50 minutes faster than low-volume surgeons did. CONCLUSIONS: Higher surgeon and hospital case volumes led to improved perioperative metrics with all shoulder arthroplasty procedures, including reverse total shoulder arthroplasty, which has not been previously described in the literature. Surgeon volume had a larger effect on metrics than hospital volume did. This study supports the concept that complex shoulder procedures are, on average, performed more efficiently by higher volume surgeons in higher volume centers.

Shoulder arthroplasty in patients 59 years of age and younger.

BACKGROUND: While shoulder arthroplasty is a well established treatment for a variety of conditions about the shoulder, the results of shoulder replacement in younger patients are not as predictable. The purpose of this study is to examine the indications for shoulder arthroplasty in patients 59 years old and younger, and to analyze revision rates between younger and older patients. METHODS: This is a retrospective cohort study of shoulder arthroplasties performed within a statewide integrated healthcare system between 2005 and 2010. Patients were stratified into 2 groups based on age at time of index replacement procedure: younger patients (≤59 years) and older patients (>59 years). RESULTS: There were 2981 primary arthroplasties followed for a median time of 2.2 years (interquartile range, 1.0-3.8), 90 (3.0%) of which required revisions. After adjusting for procedure type and diagnosis, younger patients had a two times higher risk (95% CI 1.2-3.5, P = .007) of revision than older patients. When looking at the risk of revision in younger and older patients separately, the risk of revision in hemiarthroplasty (RR = 4.5 vs RR = 1.7) and reverse total shoulder arthroplasty (RR = 33.6 vs RR = 3.0) compared to total shoulder arthroplasty were higher in younger patients compared to older patients. CONCLUSION: This study suggests patients 59 years and younger have an increased risk of revision at early follow-up. The higher risk of revision in younger patients receiving hemiarthroplasty may support the use of total shoulder arthroplasty in patients 59 years of age and younger.

Risk of thromboembolism in shoulder arthroplasty: effect of implant type and traumatic indication.

BACKGROUND: Prior research about symptomatic venous thromboembolism (VTE) after shoulder arthroplasty has not determined whether procedure type (hemiarthroplasty, total shoulder arthroplasty, or reverse shoulder arthroplasty) or surgical indication (traumatic or elective) represent risk factors for VTE after shoulder replacement. QUESTIONS/PURPOSES: We therefore asked whether the risk of symptomatic VTE events and mortality within 90 days of shoulder arthroplasty was influenced by (1) procedure type, and (2) surgical indication (traumatic or elective). METHODS: We performed a retrospective database review of symptomatic VTE events and mortality within 90 days of shoulder arthroplasty in a large (30-hospital) integrated healthcare system over a 5-year period, from January 2005 to December 2009. We compared the likelihood of VTE and death in patients undergoing reverse shoulder arthroplasties (RSAs), total shoulder arthroplasties (TSAs), and hemiarthroplasties (HAs), and we compared the likelihood of VTE and death in patients who underwent elective shoulder arthroplasties with those who underwent shoulder arthroplasty in the setting of acute trauma. RESULTS: In the 2574 eligible shoulder arthroplasties identified during the study period, VTE developed in 1.01% of patients (deep vein thrombosis 0.51% and pulmonary embolism 0.54%). With the numbers available, no differences were observed in rates of VTE or mortality by procedure type. A trend toward increased VTE occurred more frequently in patients having surgery for traumatic indications than after elective surgery (1.71% versus 0.80%; p = 0.055). A higher likelihood of 90-day mortality was observed in trauma patients compared with elective (odds ratio = 7.4; 95% CI, 2.4-25.2). CONCLUSIONS: VTE occurred infrequently in this study sample. These data support future risk and benefit assessment of routine pharmacologic VTE prophylaxis in the perioperative treatment of patients undergoing shoulder arthroplasty, especially in all RSA and traumatic HA subsets, where the risk of VTE may be higher.