Risk Factors for Greater Than 24-Hour Length of Stay After Primary Total Knee Arthroplasty.

BACKGROUND: Recently, the Center for Medicare Services removed total knee arthroplasty (TKA) from the inpatient-only procedure list. The purpose of this study is to assess the role of demographics, medical comorbidities, and postsurgical complications in predicting safe discharge to home within 24 hours after TKA. METHODS: Patients undergoing primary TKA between 2011 and 2016 were identified in the American College of Surgeons National Surgical Quality Improvement Program. Patients were grouped into those whose length of stay (LOS) was less than 24 hours after surgery vs those greater than 24 hours. Demographics, preoperative comorbidities, operative variables, and postoperative adverse events were studied as risk factors for LOS greater than 24 hours. RESULTS: A total of 210,075 patients undergoing primary TKA met the inclusion criteria, and of those, 18,134 (8.6%) patients were discharged within 24 hours postoperatively. In a risk-adjusted multivariate analysis, patients with increasing age, obesity, preoperative comorbidities of smoking, diabetes, dyspnea, chronic obstructive pulmonary disease, hypertension, bleeding disorder, corticosteroid use preoperatively, and dependent functional status conferred a greater risk for discharge greater than 24 hours. Male gender, spinal anesthesia, and monitored anesthesia care were protective against LOS greater than 24 hours. CONCLUSION: This study suggests that dependent functional status, preoperative comorbidities, and postoperative complications are all associated with a LOS greater than 24 hours after TKA. Surgeons and patients should be aware of the clinical and demographic variables associated with risk for LOS greater than 24 hours when considering outpatient status for patients undergoing TKA.

Proximal Femoral Growth Modification: Effect of Screw, Plate, and Drill on Asymmetric Growth of the Hip.

BACKGROUND: Guided growth has long been used in the lower extremities but has not been applied to varus or valgus deformity in the hip, as may occur in children with cerebral palsy or developmental dysplasia of the hip. The purpose of this study was to determine if screw, plate, or drilling techniques decreased the femoral neck-shaft angle (NSA) and articular trochanteric disease (ATD), as well as describe growth plate structural changes with each method. METHODS: Twelve 8-week-old lambs underwent proximal femoral hemiepiphysiodesis (IACUC approved) using either a screw (n=4), plate (n=4), or drilling procedure (n=4). Postoperative time was 6 months. Radiographs taken after limb harvest were used to measure NSA and ATD. Differences between treated and control sides were determined by 1-tailed paired t tests and Bonferroni (α=0.05/3). Histology was obtained for 1 limb pair per group. Proximal femurs were cut in midcoronal plane and the longitudinal growth plates were examined for structural changes. RESULTS: The mean NSA measured 7 degrees less than controls in this model using the screw technique, and this difference was statistically significant. Differences between the control and the treated groups did not reach statistical significance for either the plate or the drill group. Differences in ATD were not statistically significant, although there was a trend for larger ATD measurements using the screw technique. Histologically, physeal changes were observed on the operative sides in screw and plate specimens, but not drill specimens, compared with contralateral sham control. The screw specimen exhibited the most severe changes, with growth plate closure over half the section. The plate specimen showed focal loss of the physis across the section, but with no evidence of closure. CONCLUSIONS: This study builds on previous work that indicates screw hemiepiphysiodesis can effectively alter the shape of the proximal femur, and result in a lower neck-shaft ankle (or lesser valgus). This study suggests that implantation of a screw is likely to be more effective than a plate or drilling procedure in decreasing the NSA in skeletally immature hips. CLINICAL SIGNIFICANCE: If further preclinical, and later clinical, studies demonstrate reproducible efficacy, guided growth of the proximal femur may eventually become a viable option for treatment or prevention of hip deformity in select patients.

Is preoperative radiation therapy as effective as postoperative radiation therapy for heterotopic ossification prevention in acetabular fractures?

BACKGROUND: Prophylactic approaches to prevent heterotopic ossification after acetabular fracture surgery have included indomethacin and/or single-dose external beam radiation therapy administered after surgery. Although preoperative radiation has been used for heterotopic ossification prophylaxis in the THA population, to our knowledge, no studies have compared preoperative and postoperative radiation therapy in the acetabular fracture population. QUESTIONS/PURPOSES: We determined whether heterotopic ossification frequency and severity were different between patients with acetabular fracture treated with prophylactic radiation therapy preoperatively and postoperatively. METHODS: Between January 2002 and December 2009, we treated 320 patients with a Kocher-Langenbeck approach for acetabular fractures, of whom 50 (34%) were treated with radiation therapy preoperatively and 96 (66%) postoperatively. Thirty-four (68%) and 71 (74%), respectively, had 6-month radiographs available for review and were included. For hospital logistical reasons, patients who underwent operative treatment on a Friday or Saturday received radiation therapy preoperatively, and all others received it postoperatively. The treatment groups were comparable in terms of most demographic parameters, injury severity, and fracture patterns. Six-month postoperative radiographs were reviewed and graded according to Brooker. Followup ranged from 6 to 93 months and 6 to 97 months for the preoperative and postoperative groups, respectively. Post hoc power analysis showed our study was powered to detect a difference of 22% or more between patients with severe heterotopic ossification. Sample size calculations showed 915 subjects would be needed to detect a 5% relative difference in severe heterotopic ossification status between groups. RESULTS: We detected no difference in heterotopic ossification frequency between the preoperative (eight of 36, 22%) and postoperative (19 of 71, 27%) groups (p=0.609). There was also no difference in heterotopic ossification severity between groups (p=0.666). Two of 36 (6%) in the preoperative group and three of 71 (4%) in the postoperative group developed clinically significant Grade III heterotopic ossification. No patients developed Grade IV heterotopic ossification. CONCLUSIONS: We found no difference in heterotopic ossification frequency or severity when comparing preoperative and postoperative radiation therapy. However, given the relatively low frequency of heterotopic ossification in this population, in particular the frequency of severe or symptomatic heterotopic ossification, the possibility of a Type II error must be considered. Larger, prospective studies are required to confirm our no-difference finding, but insofar as the result in this fracture population mirrors that of the THA population, unless our finding is disproven, we believe radiation therapy can be given either before or after surgery, as dictated by the clinical scenario. LEVEL OF EVIDENCE: Level III, therapeutic study. See Instructions for Authors for a complete description of levels of evidence.

The trochlear cleft: initial experience in elite athletes.

OBJECTIVE: The trochlear cleft is a recently described vertically oriented, low-signal cartilage lesion centered in the trough of the trochlear cartilage. The purpose of our study was to determine the incidence of clefts in an at-risk group of athletes and correlate these findings with clinical and physical examination results. MATERIALS AND METHODS: Sixteen female collegiate volleyball players consented to bilateral knee evaluations, which consisted of history, physical examination, and magnetic resonance (MR) imaging. Two fellowship-trained musculoskeletal radiologists reviewed each MR study by consensus. The trochlear cartilage was considered to be either normal, at risk of developing a cleft, or meeting the previously described criteria for clefts. The Fisher exact test was used for categorical variables, and the Mann-Whitney U test was used for nonparametric continuous variable. RESULTS: A total of 16 athletes (32 knees; 16 women; age range, 18-22 years; mean, 19.9 years) were enrolled in the study. Four knees (13%) in 3 athletes were diagnosed with a trochlear cleft; 6 knees (19%) in 4 athletes had clefts or were at risk of developing clefts. Among those players with unilateral cartilage lesions, 67% had contralateral abnormalities (P = 0.0783). Functional outcomes and physical examination findings were within normal limits for all athletes, with no difference noted between those with and without clefts. CONCLUSIONS: Elite athletes have a much higher incidence of trochlear clefts than the general population and are at risk of bilateral disease. Clefts are likely to be an incidental finding at MR imaging for unrelated symptoms.

The value of interpretation of intraoperative fluoroscopy by radiologists during pediatric fracture treatment.

BACKGROUND: Orthopaedic surgeons frequently use intraoperative fluoroscopy to aid in the real-time decision-making process during fracture treatment. Radiologists routinely interpret and report on these fluoroscopic images. The goal of this combined retrospective and prospective study was to assess the value of this practice of having radiologists interpret intraoperative fluoroscopy for pediatric fracture treatment. METHODS: In 500 consecutive pediatric patients who underwent fracture treatment in the operating room during a 1-year period, the following 4 parameters were retrospectively reviewed: (1) time between completion of procedure and availability of radiologist's report, (2) discrepancies between the surgeon-dictated operative report and the radiologist's report on the fluoroscopic images, (3) recommendations or unexpected findings in the radiologist's report, and (4) charges and reimbursement for the radiologist to report on the fluoroscopic images. In an additional 76 consecutive pediatric trauma patients, the number of intraoperative fluoroscopy images taken during fracture treatment and the number saved and sent to the radiologist were collected in a prospective and blinded manner. RESULTS: In 500 consecutive cases, 89% of radiologist reports were not available until after the end of the procedure. There was no discrepancy between the surgeon-dictated operative report on use of fluoroscopy and the radiologist's interpretation of the fluoroscopic images. Three (0.6%) patients had an unexpected finding on the radiologist's report but that did not change the fracture treatment. The mean charge by the radiologist was $166.96±11.84 and the mean reimbursement was $5.83±7.01. For the prospective arm of the study, 41.9% of all intraoperative fluoroscopy images taken were saved and sent to the radiologist. CONCLUSIONS: For the majority of procedures, the radiologist report was not available until after the end of the procedure. The radiologist's interpretation of intraoperative fluoroscopy did not alter fracture treatment in any patient. Because of limited benefit and low reimbursement, this study suggests that the practice of having a radiologist interpret intraoperative fluoroscopy during fracture treatment adds little value to patient care. LEVEL OF EVIDENCE: Decision Analysis Level II.

Perioperative risks associated with the operative treatment of clavicle fractures.

BACKGROUND: Clavicle fractures are a common injury among young adults who were historically treated non-operatively with satisfactory outcomes. However, more recent studies have shown a higher nonunion rate for displaced clavicle fractures treated conservatively. The purpose of this study is to investigate the midterm complications, clinical outcomes and overall patient satisfaction after osteosynthesis of midshaft clavicular fractures. PATIENTS AND METHODS: A total of 37 patients treated for a clavicle fracture from January 2007 to December 2008 with at least 12 months' follow-up were identified from a billing code search. At the latest follow-up appointment, the patients completed the Constant Shoulder, the Disabilities of the Arm, Shoulder and Hand scale (DASH) and the Medical Outcomes Study 36-Item Short-Form Health Survey version 2.0 (SF36v2) functional outcome surveys as well as a custom questionnaire to assess hand dominance, employment status, the amount of time taken before returning to work, the presence of numbness around the incision site (a surrogate marker of a supraclavicular nerve palsy), whether the patient desired the plate removed and/or if it was worth another surgery. RESULTS: With regard to the functional outcome surveys, the average DASH score was 11.8 ± 16.4, the Constant score was 93.3 ± 7.2, the SF36v2 physical component summary (PCS) was 50.7 ± 10.1 and the SF36v2 mental component summary (MCS) 50.6 ± 11.2. From the custom questionnaire, 27 patients (73%) found their cosmetic appearance acceptable while the remaining 10 patients (27%) were bothered by the appearance of the plate. The average time to return to work was 82.1 ± 77.4 days. There were no infections, refractures or nonunions of the clavicle. CONCLUSION: As the relative indications for open reduction and internal fixation of clavicle fractures become more popular, such as cosmetic concerns or faster recovery, we wish to demonstrate that the procedure is not without risks, including implant discomfort requiring a subsequent operation for removal, numbness around the incision site and infection. Despite these risks, patients tend to be satisfied with the procedure and are able to function at levels equal to that of the general population. The purpose of this study is not to recommend for or against operative treatment of clavicle fractures but merely to demonstrate risks associated with the procedure.