Anterior capsulectomy versus repair in direct anterior total hip arthroplasty.

BACKGROUND: Utilization of the direct anterior approach for total hip arthroplasty (DAA THA) has increased over the last ten years. The preservation and repair of the anterior hip capsule has been recommended, while anterior capsulectomy has been described by others. In contrast, the higher risk of posterior dislocation using the posterior approach improved significantly after capsular repair. No studies to date have investigated outcome scores based on capsular repair versus capsulectomy for the DAA. METHODS: Patients randomized to anterior capsulectomy or anterior capsule repair. Patients were blinded to their randomization. Maximum hip flexion was measured both radiographically and clinically with a goniometer. Using a one-sided t test assuming equal variance with an effect size, Cohen's d, of 0.6 and an alpha of 0.05, 36 patients in each group (total 72 patients) needed for a minimum 80% power. RESULTS: Median goniometer measurements preoperatively were 95° for repair (IQR 85-100) and 91° for capsulectomy (IQR 82-97.5) (p = 0.52). Four-month and one-year goniometer measurements also had no significant difference, 110° (IQR 105-120) and 110° (IQR 105-120) for repair and 105° (IQR 96-116) and 109° (IQR 102-120) for capsulectomy (p = 0.38 and p = 0.26). Median change in flexion as measured by goniometer at 4 months and one year was 12 and 9 degrees for repair and 9.5 and 3 degrees for capsulectomy (p = 0.53 and p = 0.46). X-ray analysis showed no differences in pre-op, 4-month, and one-year flexion with median one-year flexion of 105.5° (IQR 96-109.5) for repair and 100° (IQR 93.5-112) for capsulectomy (p = 0.35). VAS scores were the same for both groups at all three time points. HOOS scores improved equally for both groups. There are no differences in surgeon randomization, age, or gender. CONCLUSIONS: Both capsular repair and capsulectomy used in direct anterior approach THA result in equal maximum clinical as well as radiographic hip flexion with no change in postoperative pain or HOOS scores.

Inter-Rater Reliability of Clinical Testing for Laxity After Knee Arthroplasty.

BACKGROUND: The clinical examination for laxity has been considered a mainstay in evaluation of the painful knee arthroplasty, especially for the diagnosis of instability. More than 10 mm of anterior-posterior (AP) translation in flexion has been described as important in the diagnosis of flexion instability. The inter-observer reliability of varus/valgus and AP laxity testing has not been tested. METHODS: Ten subjects with prior to total knee arthroplasty (TKA) were examined by 4 fellowship-trained orthopedic knee arthroplasty surgeons. Each surgeon evaluated each subject in random order and was blinded to the results of the other surgeons. Each surgeon performed an anterior drawer test at 30 and 90 degrees of flexion and graded the instability as 0-5 mm, 5-10 mm or >10 mm. Varus-valgus testing was also graded. Motion capture was used during the examination to determine the joint position and estimate joint reaction force during the examination. RESULTS: Inter-rater reliability (IRR) was poor at 30 and 90 degrees for both the subjective rater score and the measured AP laxity in flexion (k = 018-0.22). Varus-valgus testing similarly had poor reliability. Force applied by the rater also had poor IRR. CONCLUSION: Clinical testing of knee laxity after TKA has poor reliability between surgeons using motion analysis. It is unclear if this is from differences in examiner technique or from differences in pain or quadriceps function of the subjects. Instability after TKA should not be diagnosed strictly by clinical testing and should involve a complete clinical assessment of the patient.

Management of Periprosthetic Joint Infection and Extensor Mechanism Disruption With Modular Knee Fusion: Clinical and Biomechanical Outcomes.

BACKGROUND: Extensor mechanism disruption (EMD) combined with periprosthetic joint infection (PJI) after total knee arthroplasty are life-changing complications. The literature suggests many eventually receive above-knee amputation and lose ambulatory function. An alternative is modular knee fusion (KF), but little is known about its outcomes and biomechanical function. We report early term results on a case series of patients. METHODS: A retrospective review was conducted of patients who underwent 2-stage reconstruction with modular KF for combined EMD and PJI. Patient-reported outcomes at 1 year after arthrodesis and complications of surgery were recorded. Biomechanical analysis was conducted on 6 patients >1 year after surgery to measure gait speed and balance. RESULTS: Fifteen patients received a modular KF. At the most recent follow-up visit (average 25.7 months), 12 patients had their modular KFs in place and were ambulatory while 2 had died. Six patients used a walker; 4, a cane; and 2, unassisted. Gait analysis of 6 of these patients showed variation in patterns and speed. Balance was better than historical controls treated with above-knee amputation. Average Knee Injury and Osteoarthritis Outcome Score Junior was 76 ± 11. CONCLUSION: Modular KF for EMD and PJI can result in successful outcomes in terms of preventing additional operations and maintaining ambulation. While speed is variable, physical testing shows this method for limb salvage may allow patients to ambulate with a gait aid although further studies are needed to evaluate midterm and long-term results.

Narcotic Refills and Patient Satisfaction With Pain Control After Total Joint Arthroplasty.

BACKGROUND: Patient satisfaction has become an important metric for total joint arthroplasty (TJA) used to reimburse hospitals. Despite ubiquitous narcotic use for post-TJA pain control, there is little understanding regarding patient factors associated with obtaining opioid refills and associations with patient satisfaction. METHODS: Using our state's mandatory opioid prescription monitoring program, we reviewed preoperative and postoperative narcotic prescriptions filled for 438 consecutive TJA patients. Subjects were divided into 3 groups based on the number of post-TJA narcotic refills obtained (0, 1, or >1), and logistic regression analysis was conducted comparing demographics, surgical factors, and satisfaction with pain control. RESULTS: One hundred twenty-five patients (25.8%) did not consume preoperative opioids and received no postoperative refills. Total hip arthroplasty (THA) patients (P = .0004), subjects ≥65 years (P = .0057), and Medicare patients (P = .0058) had significantly higher rates of 0 postdischarge refills. THA recipients had 268% increased odds of not receiving a refill narcotic (adjusted odds ratio = 0.373; 95% confidence interval, 0.224- 0.622). Every 100-morphine milligram equivalent (MME) increase in presurgery use led to a 16% increase in odds of needing >1 opioid refill (adjusted odds ratio = 1.161; 95% confidence interval, 1.085-1.242). Subjects who noted higher satisfaction consumed less overall opioids when receiving a refill (436 vs 1119 MMEs, P = .021). CONCLUSION: Subjects who received fewer narcotic prescriptions and overall MMEs demonstrated higher rates of satisfaction with early pain control. Our results are consistent with other studies in showing that increased preoperative narcotic use portends higher rates of postoperative refills. There appears to be a subset of THA patients >65 years of age who may be candidates for opioid-sparing analgesia.

Dissociation of Acetabular Polyethylene Liners With a Morse Taper Design.

BACKGROUND: Polyethylene liner dissociation is an uncommon complication of hip replacement. Dissociation has been associated with particular acetabular component designs. This study reviewed acetabular liner dissociations in a specific modular cup with a Morse taper locking mechanism that has not been previously reported. METHODS: The senior author performed 655 primary total hip arthroplasties with one particular design of acetabular component using Class A polyethylene liners and metal head articulation. Cases with revision surgery performed for acetabular liner dissociation were reviewed. RESULTS: Seven of 655 patients with this cup underwent revision surgery for a dissociated liner. Liner dissociation occurred at a mean of 73 months postoperatively. Patients presented with new-onset hip pain or squeaking, 4 of which developed symptoms acutely. Two patients treated with polyethylene liner exchange into the same cup required a second revision surgery for recurrent dissociation. CONCLUSION: Polyethylene liner dissociation is an infrequent but possible complication associated with modular acetabular components using a Morse taper locking. Providers should be vigilant with long-term follow-up of patients with this acetabular system for patient complaints of catching or squeaking. Patients treated for liner dissociation should not have a new liner placed into the same acetabular shell given the risk for further dissociation.

Total Knee Periprosthetic Joint Infection in the Setting of Hematologic Malignancy: Considerations for Management.

Patients with malignancy are often profoundly immunocompromised due to chemotherapy, placing them at potential increased risk for periprosthetic joint infection (PJI). However, there is little information regarding PJI management in these patients. We describe 4 patients with a history of primary total knee arthroplasty followed by diagnosis of multiple myeloma or Waldenström macroglobulinemia who received chemotherapy within 4 months prior to PJI. The Musculoskeletal Infection Society major and minor criteria and either debridement, antibiotics, and implant retention or a 2-stage approach appear to be effective for acute or chronic PJI, respectively. We recommend an anticoagulant be administered concomitantly with antineoplastics that significantly increase deep vein thrombosis risk, and we recommend long-term oral suppressive antibiotics postoperatively, especially if chemotherapy will be resumed. Additional studies are needed to investigate risks and benefits of PJI prophylaxis during chemotherapy and long-term suppressive antibiotics after PJI treatment.

The Effect of the COVID-19 Pandemic on Electively Scheduled Hip and Knee Arthroplasty Patients in the United States.

BACKGROUND: In response to the COVID-19 pandemic, hospitals in the United States were recommended to stop performing elective procedures. This stoppage has led to the cancellation of a large number of hip and knee arthroplasties. The effect of this on patients' physical mental and economic health is unknown. METHODS: A survey was developed by the AAHKS Research Committee to assess pain, anxiety, physical function, and economic ability of patients to undergo a delayed operation. Six institutions conducted the survey to 360 patients who had to have elective hip and knee arthroplasty cancelled between March and July of 2020. RESULTS: Patients were most anxious about the uncertainty of when their operation could be rescheduled. Although 85% of patients understood and agreed with the public health measures to curb infections, almost 90% of patients plan to reschedule as soon as possible. Age and geographic region of the patients affected their anxiety. Younger patients were more likely to have financial concerns and concerns about job security. Patients in the Northeast were more concerned about catching COVID-19 during a future hospitalization. CONCLUSIONS: Patients suffering from the pain of hip and knee arthritis continue to struggle with pain from their end-stage disease. They have anxiety about the COVID-19 pandemic. Few patients feel they will be limited financially and 90% want to have surgery as soon as possible. Age and physical location of the patients affect their causes for anxiety around their future surgery.

Improvements in Isokinetic Quadriceps and Hamstring Strength Testing After Focused Therapy in Patients With Flexion Instability.

BACKGROUND: There is a paucity of literature to guide non-operative treatment for patients with problems after total knee arthroplasty (TKA). We sought to quantify how quadriceps and hamstring strength could improve with focused physical therapy (PT) and whether improving leg strength may prevent revision surgery for patients with flexion instability (FI) after TKA. METHODS: This retrospective study included patients diagnosed with FI by one of the 4 fellowship-trained arthroplasty surgeons at a single academic institution. Patients with FI were referred for strength measurements and a focused PT program. In total, 166 patients completed isokinetic testing to quantify their relative quadriceps and hamstring power, torque, and work measures compared to their contralateral leg. Fifty-five (33.5%) patients subsequently completed post-PT isokinetic testing. Statistical analysis was conducted to evaluate strength deficits in the knee with FI. RESULTS: Patients with FI were found to be 20.5%-38.4% weaker in all strength domains compared to the contralateral leg (P < .001). Patients who completed PT and pre-isokinetic and post-isokinetic testing demonstrated statistically significant gains in all extension metrics by a net range of 24.7%-34.2% (P = .011-.029) and their flexion strength metrics improved by 32.5%-40.2% (P = .002-.005). About 81.9% of patients in this subgroup did not undergo revision TKA. Those subjects who went on to revision did not statistically improve in any strength domain (P = .063-.121). CONCLUSION: Patients with FI after TKA have significantly weaker quadriceps and hamstrings in the operative compared to contralateral leg. Patients who did not undergo revision knee arthroplasty and completed a formal PT program improved quadriceps and hamstring strength by 30%. LEVEL OF EVIDENCE: IV (Case series).

The Rapid Response to the COVID-19 Pandemic by the Arthroplasty Divisions at Two Academic Referral Centers.

The COVID-19 pandemic has created widespread changes across all of health care. As a result, the impacts on the delivery of orthopedic services have been challenged. To ensure and provide adequate health care resources in terms of hospital capacity and personnel and personal protective equipment, service lines such as adult reconstruction and lower limb arthroplasty have stopped or substantially limited elective surgeries and have been forced to re-engineer care processes for a high volume of patients. Herein, we summarize the similar approaches by two arthroplasty divisions in high-volume academic referral centers in (1) the cessation of elective surgeries, (2) workforce restructuring, (3) phased delivery of outpatient and inpatient care, and (4) educational restructuring.

Streamlining Hospital Treatment of Prosthetic Joint Infection.

BACKGROUND: Prosthetic joint infection (PJI) is associated with significant morbidity, mortality, and costs. We developed a fast-track PJI care system using an infectious disease physician to work directly with the TJA service and coordinate in the treatment of PJI patients. We hypothesized that streamlined care of patients with hip and knee PJI decreases the length of the acute hospital stay without increasing the risk of complication or incorrect antibiotic selection. METHODS: A single-center retrospective chart review was performed for all patients treated operatively for PJI. A cohort of 78 fast-track patients was compared to 68 control patients treated before the implementation of the program. Hospital length of stay (LOS) and cases of antibiotic mismatch were primary outcomes. Secondary outcomes, including 90-day readmissions, reoperations, mortality, rate of reimplantation, and 12-month reimplant survival, were compared. Cox regressions were analyzed to assess the effects on LOS of patient demographics and the type of surgery performed. RESULTS: Average hospital LOS from infection surgery to discharge was significantly lower in the fast-track cohort (3.8 vs 5.7 days; P = .012). There were no episodes of antibiotic mismatch in the fast-track group vs 1 recorded episode in the control group. No significant differences were noted comparing 90-day complications, reimplantation rate, or 12-month reimplant survival rates. CONCLUSION: Through the utilization of an orthopedic-specific infectious disease physician, a fast-track PJI protocol can significantly shorten hospital LOS while remaining safe. Streamlining care pathways may help decrease the overall healthcare costs associated with treating PJI.

Cost Analysis and Bundled Care of Hip and Knee Replacement.

Financial success in a bundled payment system requires knowledge of the costs of care throughout the period of risk. Understanding the significant cost-drivers of total joint arthroplasty (TJA) is crucial in this effort. This article inspects the basics of reimbursement under Medicare's bundled care programs as well as some common investigative tools used in the literature to measure cost. Additionally, the effects of standardized enhanced recovery clinical pathways on costs are reviewed. Finally, drivers of implant costs and several proven measures for implant cost-reduction are evaluated. This review provides surgeons and hospitals successful measures to reduce the cost of TJA via enhanced recovery pathways and reduced implant pricing. (Journal of Surgical Orthopaedic Advances 28(4):241-249, 2019).

Rapid Recovery After Total Joint Arthroplasty Using General Anesthesia.

BACKGROUND: Multiple papers have purported the superiority of spinal anesthesia used in total joint arthroplasty (TJA). However, there is a paucity of data available for modern general anesthesia (GA) regimens used at high-volume joint replacement centers. METHODS: We retrospectively reviewed a series of 1527 consecutive primary TJAs (644 total hip arthroplasties and 883 total knee arthroplasties) performed over a 3-year span at a single institution that uses a contemporary GA protocol and report on the length of stay, early recovery rates, perioperative complications, and readmissions. RESULTS: From the elective TJAs performed using a modern GA protocol, 96.3% (n = 1471) of patients discharged on postoperative day 1, and 97.2% (n = 1482) of subjects were able to participate with physical therapy on the day of surgery. Only 6 patients (0.4%) required an intensive care unit stay postoperatively. The 90-day readmission rate over this time was 2.4% (n = 36), while the reoperation rate was 1.3% (n = 20). DISCUSSION: Neuraxial anesthesia for TJA is commonly preferred in high-volume institutions utilizing contemporary enhanced recovery pathways. Our data support the notion that the utilization of modern GA techniques that limit narcotics and certain inhalants can be successfully used in short-stay primary total joint arthroplasty. LEVEL OF EVIDENCE: IV- Case series.

Management of Severe Proximal Femur Bone Loss With a Modular Articulating Antibiotic Spacer.

INTRODUCTION: Management of periprosthetic infection in total hip arthroplasties is challenging, especially when there is severe loss of proximal femoral bone stock. When a 2-stage approach is used, either a static or an articulating spacer may be considered. Static spacers leave the patient with a flail leg, which can be very difficult with massive bone loss. The purpose of this study is to report a novel technique for articulating antibiotic spacers and report our results. MATERIALS AND METHODS: We describe a technique for an articulating hip spacer in the setting of a large amount of proximal femoral bone loss using a locked intramedullary nail, modular femoral body, and an all-polyethylene constrained acetabular component. This technique allowed for mobilization of the patient without a flail leg. Four patients underwent 2-stage reconstruction, and the case series is reported here. RESULTS: No complications occurred due to the spacer, and in all cases, a second reconstruction was later carried out after treatment with intravenous antibiotics. Three of 4 patients did well after 2-stage reconstruction, with 1 patient ultimately requiring an amputation. DISCUSSION: We feel this technique improves upon previously reported large spacers due to the stability and maintenance of leg length. CONCLUSION: This technique offers a modular solution to address massive bone loss of the proximal femur in the face of periprosthetic joint infection.

New Failure Mechanism of Acetabular Constrained Liner: A Case Report.

Implant dislocation following total hip arthroplasty, particularly revision arthroplasty, remains a common postoperative complication. Constrained acetabular liners provide surgeons with an implant option that provides resistance to dislocation forces. These added forces, however, are transmitted to the implant materials and to the bone\endash implant interface, resulting in unique failure mechanisms. This case report presents two cases highlighting a previously unreported mechanism of failure of the Depuy Pinnacle ES constrained liner encountered during intraoperative implantation of the components (Journal of Surgical Orthopaedic Advances 28(1):68-73, 2019).

After-Hours Calls in a Joint Replacement Practice.

BACKGROUND: Early discharge after joint arthroplasty requires additional resources to manage patients safely after surgery. Patient concerns must be addressed during nonbusiness hours to keep patients out of the emergency department and avoid readmissions. The goal of our study was to determine how type of system is utilized in a busy early discharge joint replacement practice. METHODS: In our total joint program, we have utilized a Google phone number to give patients access to a member of the surgical team after business hours and on weekends. The duration, chief complaint, and resolution of from the phone calls were collected prospectively for 3 months (July 3, 2017-October 3, 2017). RESULTS: Sixty-eight calls were received from 55 patients during the 3-month study period. Three hundred twenty-five cases were performed. The average duration of a call was 3.9 minutes. The average length of time from surgery to call was 17.5 days (range 0-442 days). Suboptimal health literacy was associated with increased calls within the first week after surgery (odds ratio = 4.1, 95% confidence interval = 1.2-14.5, P = .022). A chief complaint of pain was associated with primary versus revision surgery. (odds ratio = 3.23, 95% confidence interval = 1.08-9.86). DISCUSSION: An "after-hours" telephone contact service with a member of the surgical team may help avoid unnecessary emergency department visits. About one phone call was received per day, with an average duration of 3.9 minutes per call. These additional resources are necessary to maintain patient safety and satisfaction in early discharge joint replacement.

Inpatient versus Outpatient Total Knee Arthroplasty.

The rise of improved perioperative recovery protocols after total knee arthroplasty (TKA) has led to faster, more streamlined hospital stays for many patients. Combined with the implementation of value-based care and bundled payment initiatives, there has been a paradigm shift toward outpatient TKA surgery. This change to practice has been accelerated by recent policy changes enacted by the Center for Medicaid and Medicare Services regarding the removal of TKA as an inpatient only procedure as well as some insurance companies denying preauthorization for inpatient stays after TKA. Our review aims to address the inclusion and exclusion criteria for outpatient TKA consideration, examine the outcomes for outpatient joint replacement surgery, and discuss limitations of widespread adoption for same-day discharges.

Flexion Instability After Total Knee Arthroplasty.

Flexion instability after total knee arthroplasty (TKA) is caused by an increased flexion gap compared with extension gap. Patients present with recurrent effusions, subjective instability (especially going downstairs), quadriceps weakness, and diffuse periretinacular pain. Manual testing for laxity in flexion is commonly done to confirm a diagnosis, although testing positions and laxity grades are inconsistent. Nonsurgical treatment includes quadriceps strengthening and bracing treatment. The mainstays to surgical management of femoral instability involve increasing the posterior condylar offset, decreasing the tibial slope, raising the joint line in combination with a thicker polyethylene insert, and ensuring appropriate rotation of implants. Patient outcomes after revision TKA for flexion instability show the least amount of improvement when compared with revisions for other TKA failure etiologies. Future work is needed to unify reproducible diagnostic criteria. Advancements in biomechanical analysis with motion detection, isokinetic quadriceps strength testing, and computational modeling are needed to advance the collective understanding of this underappreciated failure mechanism.