Identification of Surgeon Outliers to Improve Cost Efficiency: A Novel Use of the Centers for Medicare and Medicaid Quality Payment Program.

BACKGROUND: Bundled payment programs for total joint arthroplasty (TJA) have become popular among both private and public payers. Because these programs provide surgeons with financial incentives to decrease costs through reconciliation payments, there is an advantage to identifying and emulating cost-efficient surgeons. The objective of this study was to utilize the Centers for Medicare and Medicaid Services (CMS) Quality Payment Program (QPP) in combination with institutional data to identify cost-efficient surgeons within our region and, subsequently, identify cost-saving practice patterns. METHODS: Data was obtained from the CMS QPP for total knee (TKA) and total hip (THA) surgeons within a large metropolitan area from January 2019 to December 2021. A simple linear regression determined the relationship between surgical volume and cost-efficiency. Internal practice financial data determined whether patients of identified surgeons differed with respect to x-ray visits, physical therapy visits, out-of-pocket payments to the practice, and whether surgery was done in hospital or surgical center settings. RESULTS: There were four TKA and three THA surgeons who were cost-efficiency outliers within our area. Outliers and non-outlier surgeons had patients who had similar BMI, ASA, and age-adjusted CCI scores. Patients of these surgeons had fewer x-ray visits for both TKA and THA (1.06 versus 1.11, P < 0.001; 0.94 versus 1.15, P < 0.001) and lower out-of-pocket costs ($86.10 versus $135.46, P < 0.001; $116.10 versus $177.40, P < 0.001). If all surgeons performing > 30 CMS cases annually within our practice achieved similar cost-efficiency, the savings to CMS would be $17.2 million for TKA alone ($75,802,705 versus $93,028,477). CONCLUSION: The CMS QPP can be used to identify surgeons who perform cost-efficient surgeries. Practice patterns that result in cost savings can be emulated to decrease the cost curve, resulting in reconciliation payments to surgeons and institutions and cost savings to CMS.

Acetabular fracture pattern is altered by pre-injury sacroiliac joint autofusion.

PURPOSE: Acetabular fracture shape is determined by the direction of force applied. We perceive an anecdotally observed connection between pre-existing autofused sacroiliac joints (aSIJ) and high anterior column (HAC) injuries. The purpose of this study was to compare variations in acetabular fracture patterns sustained in patients with and without pre-injury sacroiliac (SI) joint autofusion. METHODS: All adult patients receiving unilateral acetabular fixation (level 1 academic trauma; 2008-2018) were reviewed. Injury radiographs and CT scans were reviewed for fracture patterns and pre-existing aSIJ. Fracture types were subgrouped presence of HAC injury (includes anterior column (AC), anterior column posterior hemitransverse (ACPHT), or associated both column (ABC)). ANALYSIS: Logistic regression determined the association between aSIJ and HAC. RESULTS: A total of 371 patients received unilateral acetabular fixation (2008-2018); 61 (16%) demonstrated CT evidence of idiopathic aSIJ. These patients were older (64.1 vs. 47.4, p < 0.01), more likely to be male (95% vs. 71%, p < 0.01), less likely to be smokers (19.0% vs. 44.8%, p < 0.01), and were injured from lower energy mechanisms (21.3% vs. 8.4%, p = 0.01). The most common patterns with autofusion were ACPHT (n = 13, 21%) and ABC (n = 25, 41%). Autofusion was associated with greater odds of patterns involving a high anterior column injury (ABC, ACPHT, or isolated anterior column; OR = 4.97, p < 0.01). After adjusting for age, mechanism, and body mass index, the connection between autofusion and high anterior column injuries remained significant (OR = 2.60, p = 0.01). CONCLUSIONS: SI joint autofusion appears to change mode of failure in acetabular injuries; a more rigid posterior ring may precipitate a high anterior column injury. LEVEL OF EVIDENCE: Prognostic level III.

Comparing Risk Assessment Between Payers and Providers: Inconsistent Agreement in Medical Comorbidity Records for Patients Undergoing Total Joint Arthroplasty.

BACKGROUND: The proper risk adjustment for total hip arthroplasty (THA) and total knee arthroplasty (TKA) relies on an accurate assessment of comorbidity profiles by both the payer and the institution. The purpose of this study was to determine how strongly comorbidities tracked by our institution agreed with the same comorbidities reported by payers in patients undergoing THA and TKA. METHODS: All patients of a single payer undergoing primary THA and TKA at a single institution between January 5, 2021 and March 31, 2022 were included (n = 876). There were 8 commonly collected medical comorbidities obtained from institutional medical records and matched with patient records reported by the payer. Fleiss Kappa tests were used to determine agreement of payer data with institutional records. There were 4 medical risk calculations collected from our institutional records and compared with an insurance member risk score reported by the payer. RESULTS: Comorbidities reported by the institution differed significantly from those reported by payers, with Kappa varying between 0.139 and 0.791 for THA, and 0.062 and 0.768 for TKA. Diabetes was the only condition to demonstrate strong agreement for both procedures (THA; k = 0.791, TKA; k = 0.768). The insurance member risk score demonstrates the closest association with total cost and surplus for THA regardless of insurance type and for TKA procedures paid for with private commercial insurance. CONCLUSION: There is a lack of agreement between medical comorbidities within payer and institutional records for both THA and TKA. These differences may put institutions at a disadvantage within value-based care models and when optimizing patients perioperatively.

Health Policy Views and Political Advocacy of Arthroplasty Surgeons: A Survey of the American Association of Hip and Knee Surgeons Members.

BACKGROUND: The American Association of Hip and Knee Surgeons (AAHKS) is the largest specialty society for arthroplasty surgeons in the United States and is dedicated to education, research, and advocacy. The purpose of this study was to identify the health policy views of AAHKS members and better characterize their advocacy participation. METHODS: A 22 question survey was electronically distributed multiple times via email link to all 3,638 United States members of AAHKS who were in practice or training in 2022. Study results were analyzed using descriptive statistics. RESULTS: There were 311 responses (9%), with 18% of respondents being within 5 years of practice and 38% having more than 20 years of practice. Respondents identified as Republicans (40%), Independents (37%), and Democrats (21%). Top policy issues included preserving physician reimbursement and equitable fee schedule representation (95%), the burden of prior authorization (53%), the impact of Center of Medicare and Medicaid Services regulations (39%), and medical liability and tort reform (39%). Members ranked maintaining appropriate physician reimbursement (44%) and advocating for patients (37%) as the top benefits to participation in advocacy. A majority of respondents (81%) stated that they spend more time on presurgery optimization now than 10 years ago. The most common barrier to advocacy participation was a lack of time (77%). CONCLUSION: Responding AAHKS members are well-informed, politically engaged, patient-oriented, and eager for a voice in policy decisions that affect the professional future of arthroplasty surgeons. These results can be used to help direct strategic efforts of the AAHKS Advocacy Committee to further increase advocacy efforts.

Association between tourniquet use and intraoperative blood loss during below-knee amputation.

BACKGROUND: Despite over 150000 amputations of lower limbs annually, there remains a wide variation in tourniquet practice patterns and no consensus on their necessity, especially among orthopedic patient populations. The purpose of this study was to determine whether tourniquet use in orthopedic patients undergoing below knee amputation (BKA) was associated with a difference in calculated blood loss relative to no tourniquet use. AIM: To determine if tourniquet use in orthopedic patients undergoing BKA was associated with a difference in calculated blood loss relative to no tourniquet use. METHODS: We performed a retrospective review of consecutive patients undergoing BKA by orthopedic surgeons at a tertiary care hospital from 2008 through 2018. Blood loss was calculated using a combination of the Nadler equation for preoperative blood volume and a novel formula utilizing preoperative and postoperative hemoglobin levels and transfusions. Univariate and forwards step-wise multivariate linear regressions were performed to determine the association between tourniquet use and blood loss. A Wilcoxon was used to determine the univariate relationship between tourniquet use and blood loss for in the restricted subgroups of patients who underwent BKA for trauma, tumor, and infection. RESULTS: Of 97 eligible patients identified, 67 underwent surgery with a tourniquet and 30 did not. In multivariate regression, tourniquet use was associated with a 488 mL decrease in calculated blood loss (CI 119-857, P = 0.01). In subgroup analysis, no individual group showed a statistically significant decrease in blood loss with tourniquet use. There was no significant association between tourniquet use and either postoperative transfusions or reoperation at one year. CONCLUSION: We found that tourniquet use during BKA is associated with decreased calculated intraoperative blood loss. We recommend that surgeons performing this procedure use a tourniquet to minimize blood loss.

Mortality and Conversion to Transfemoral Amputation After Transtibial Amputation in the Veterans Affairs Health System.

INTRODUCTION: Transtibial below-knee amputation (BKA) is associated with considerable morbidity, particularly in the vasculopathic population. The purpose of this study was to determine the cumulative probability of undergoing transfemoral above-knee amputation (AKA) conversion within 5 years of BKA and associated risk factors while accounting for the competing risk of death. METHODS: This is a retrospective, national database study with structured query of the Veterans Affairs (VA) database for patients who underwent BKA from 1999 to 2020, identified by Current Procedural Terminology codes. Above-knee amputation conversion was identified using Current Procedural Terminology codes in combination with natural language processing to match procedure laterality. After internally validating our patient identification method, risk factors were collected. Competing risk analysis estimated the cumulative incidence rate of AKA conversion and associated risk factors with death as a competing risk. RESULTS: Our query yielded 19,875 patients (19,640 men, 98.8%) who underwent BKA with a median age of 66 years (interquartile range, 60 to 73). The median follow-up was 951 days (interquartile range, 275 to 2,026). The crude cumulative probabilities of AKA conversion and death at 5 years were 15.4% (95% confidence interval [CI], 14.9% to 16.0%) and 47.7% (95% CI, 46.9% to 48.4%), respectively. In the Fine and Gray subdistribution hazard model, peripheral vascular disease had the highest AKA conversion risk (hazard ratio [HR] 2.66; 95% CI, 2.22 to 3.20; P < 0.001). Other factors independently associated with AKA conversion included urgent operation (HR 1.32; 95% CI, 1.23 to 1.42), cerebrovascular disease (HR 1.19; 95% CI, 1.11 to 1.28), chronic obstructive pulmonary disease (HR 1.15; 95% CI, 1.07 to 1.24), and previous myocardial infarction (HR 1.10; 95% CI, 1.02 to 1.19) (All P < 0.02). DISCUSSION: Within this predominantly male, VA population, BKA carries a high risk of conversion to AKA within 5 years, without reaching a steady risk of AKA conversion within 5 years. Peripheral vascular disease, chronic obstructive pulmonary disease, cerebrovascular disease, previous myocardial infarction, and urgent BKA increase the risk of AKA conversion. LEVEL OF EVIDENCE: Level III.

Methamphetamines and Acetabular Reoperation Rates: Poor Outcomes From the Front Lines.

OBJECTIVES: To compare acetabular fracture reoperation rates within 1 year of surgery in methamphetamine ("meth") abusers and abstainers. DESIGN: Retrospective database analysis. SETTING: Level 1 academic trauma facility, 2008-2018. PATIENTS/PARTICIPANTS: Three hundred seventy-one patients who underwent unilateral traumatic acetabular open reduction internal fixation during the study period, 36 of whom abused methamphetamines through self-report or toxicology. One hundred four were excluded for indeterminate abuse histories. INTERVENTION: Open reduction internal fixation. MAIN OUTCOME MEASUREMENTS: Reoperation resulting from major surgical complications, including hematoma, seroma, deep wound infection, failure of fixation, or arthrosis with conversion to arthroplasty. RESULTS: More than 10% of our cohort used meth, representing patients who were a mean 8 years younger and sustained a higher rate of high-energy mechanisms than sober peers. Meth abusers had a greater than 2-fold reoperation rate at 90 days and 1 year compared with abstainers (17% vs. 7% and 25% vs. 11%, respectively). The adjusted odds ratio of 1-year reoperation in meth users was 3.2 (confidence interval 1.2-8.5, P = 0.03). The adjusted 1-year survival of native hip after acetabular fractures in meth users approaches 55%. CONCLUSIONS: Methamphetamine use is a nonmodifiable factor associated with a 3-fold increase in adjusted odds for 1-year reoperation after surgical fixation of acetabular fractures. LEVEL OF EVIDENCE: Prognostic Level III. See Instructions for Authors for a complete description of levels of evidence.

Complications of Intraosseous Access: Two Case Reports From a Single Center.

CASES: Intraosseous (IO) access is an effective surrogate for intravascular access in critically ill patients. We present 2 cases of IO complications. The first patient is a 44-year-old man with deep peroneal nerve sensorimotor dysfunction due to possible missed acute compartment syndrome from improper placement of a tibial IO needle. The second patient is an immunosuppressed 69-year-old man with idiopathic factor VIII deficiency who required amputation 7 months after right tibia IO access. CONCLUSION: These adverse events of IO access are limited in the literature. We make recommendations to reduce these outcomes.

Minimizing Opioids After Joint Operation: Protocol to Decrease Postoperative Opioid Use After Primary Total Knee Arthroplasty.

BACKGROUND: For decades, opioids have been the mainstay in pain management after total joint arthroplasty despite evidence that their use should be curtailed. To limit unnecessary prescribing of opioids, the US Department of Veterans Affairs (VA) Portland Health Care System Total Joints Service implemented the Minimizing Opioids After Joint Operation (MOJO) postoperative pain protocol in 2018 to reduce opioid use following total knee arthroplasty (TKA). This protocol included reductions of inpatient and outpatient opioid prescribing, preoperative optimization, use of perioperative nerve blocks, and surgery without a tourniquet. METHODS: We performed a retrospective chart review that compared the first 20 consecutive patients undergoing TKA using the MOJO protocol with the last 20 patients using the prior routine. Outcomes included total inpatient opioid use, daily opioid use, emergency department (ED) visits or readmissions within 90 days, phone calls for pain or medication refills, length of stay (LOS), and pain during inpatient hospital stay. RESULTS: There were significant differences between the pre-MOJO and the MOJO groups with regard to daily inpatient morphine equivalent dose (MED) (82 mg vs 31 mg, P < .01) and total inpatient MEDs (306 mg vs 33 mg, P < .01). There was less self-reported pain on postoperative day 1 in the MOJO group (5.5 vs 4.1, P = .01), decreased LOS (4.4 days vs 1.1 days, P < .01), fewer total ED visits (6 vs 2, P < .07), and fewer discharges to skilled nursing facilities (12 vs 0, P < .01). CONCLUSIONS: The MOJO protocol reduced postoperative opioid use after TKA in the VA setting without compromising pain control or increasing ED visits. The framework and routines described are potentially applicable to other institutions and surgical specialties.

Is Reoperation Higher Than Expected after Below-the-knee Amputation? A Single-center Evaluation of Factors Associated with Reoperation at 1 Year.

BACKGROUND: Below-the-knee amputation (BKA) is relatively common among patients with vascular disease, infection, trauma, or neoplastic disease. Many BKAs are performed in patients with incompletely treated medical comorbidities, and some are performed in patients with acute high-energy trauma or crush injuries, malignant neoplasm undergoing time-sensitive limb removal, and diabetes with active infection or sepsis. Consequently, revision is common. Prior studies of outcomes after BKA, including several based on the American College of Surgeons-National Surgical Quality Improvement Program (ACS-NSQIP) database, have follow-up periods that do not cover the entire at-risk period. QUESTIONS/PURPOSES: (1) What is the survivorship free from unplanned reoperation within 1 year of BKA? (2) What patient characteristics are associated with reoperation within 1 year of BKA? METHODS: We retrospectively studied all BKAs performed by the orthopaedic surgery service at a Level 1 trauma center from 2008 to 2018, as identified by Current Procedural Terminology (CPT) codes. Twenty-eight percent (38 of 138) underwent amputation as treatment for traumatic injury, 57% (79 of 138) for infection, and 15% (21 of 138) for malignancy. A total of 17% (23 of 138) had a final follow-up encounter before the 1-year study minimum, without differential loss to follow-up by surgical indication (p = 0.43) or hemoglobin A1c (p = 0.71). Median (range) follow-up was 570 days (6 to 3375). The primary outcome was survivorship from unplanned reoperation within 1 year of BKA index surgery or last planned reoperation, as determined by Kaplan-Meier estimation. Secondarily, we identified patient characteristics independently associated with reoperation within 1 year of BKA. Collected data included age, indication, BMI, diabetes, hemoglobin A1c level, closure method, and substance use. Unplanned reoperation was defined as irrigation and débridement, stump revision, or revision to a higher-level amputation; this did not include planned reoperations for BKAs closed in a staged manner. Factors associated with reoperation were determined using multivariate logistic regression analyses. All endpoints and variables related to patients and their surgical procedures were extracted from electronic medical records by someone other than the operating surgeon. RESULTS: Using Kaplan-Meier estimation, 38% of patients (95% confidence interval 29 to 46) who underwent BKA had an unplanned reoperation within 1 year of their index surgery. Twelve percent of patients (95% CI 7 to 17) who underwent BKA did not reach 30 days with the limb survivorship free from unplanned reoperation. The median (range) time between the initial surgery and reoperation was 54 days (6 to 315). After controlling for potential confounding variables like age, gender, platelet count, albumin, and the reason for undergoing amputation, a hemoglobin A1c level greater than 8.1% (relative to A1c ≤ 8.1%) was the only variable independently associated with increased odds of reoperation (odds ratio 4.6 [95% CI 1.3 to 18.1]; p = 0.02). CONCLUSION: BKA carries a higher risk for reoperation than currently reported in studies that use 30-day postoperative follow-up periods. Clinicians should critically assess whether BKA is necessary, especially in patients with uncontrolled diabetes assessed by hyperglycemia. Before planned BKA, patients should have documented glycemic control to minimize the odds of reoperation. Because many of this study's limitations were due to its retrospective single center design, we recommend that future work cover a clinically appropriate surveillance period using a larger cohort such as a national database and/or employ a prospective design. LEVEL OF EVIDENCE: Level III, therapeutic study.

A Systematic Review of the Utility of Postoperative Imaging in the Management of Pediatric Supracondylar Humerus Fractures.

BACKGROUND: Recently published studies call into question the clinical utility of postoperative radiographs in the management of pediatric supracondylar humerus (SCH) fractures. This topic has been addressed as part of the American Academy of Orthopaedic Surgeons Appropriate Use Criteria, although recommendations regarding serial radiographs were not included as part of the discussion. The purpose of this systematic review is to summarize the recent literature regarding the utility of postoperative radiographs as part of the management of SCH fractures. METHODS: A systematic review of the literature published between January 1, 2000 and December 31, 2017 was conducted using PubMed/MEDLINE and SCOPUS databases to identify studies relevant to postoperative management of SCH. Eight studies met the inclusion criteria, from which data pooled estimates and an analysis of heterogeneity were calculated. RESULTS: The pooled estimate of changes in fracture management on the basis of postoperative radiographs was 1% (0.98±0.33). Significant interstudy heterogeneity was observed with an I test statistic of 76%. Changes in fracture management included prolonged immobilization following pin removal and return to the operating room. CONCLUSIONS: There is a paucity of articles focusing on the utility or appropriate use of postoperative radiographs in changing management of SCH fractures, one of the most common upper extremity fractures in children. There is a very low rate of change in management on the basis of imaging, and frequently authors commented that the management change could have been prompted without routine serial radiographs. The cumulate findings of these studies suggest routine postoperative radiographs after SCH fractures are infrequently associated with changes in management. Practitioners should consider postoperative protocols with the intention of identifying early postoperative alignment loss or when the complication is suspected to prevent excessive routine radiography in the management of pediatric SCH fractures. LEVEL OF EVIDENCE: Level III-systematic review of level III studies.

Oncology Patients Are High Cost Outliers in Total Joint Replacement Bundled Payment Systems.

BACKGROUND: In 2016, the Centers for Medicare and Medicaid Services began its first mandatory bundled payment program, the Comprehensive Care for Joint Replacement (CJR) model, which covers a 90-day episode of care. This study determined whether oncology patients enrolled in the CJR bundle incur higher hospital costs than patients with osteoarthritis (OA). METHODS: A retrospective review of all patients enrolled in the CJR bundled payments system from April 1, 2016 to June 31, 2018 at a single academic medical center was conducted. To determine whether tumor patients had higher total episode costs, this group was compared to patients diagnosed with OA using a 2-tailed t-test. To adjust for moderators of total hospital costs, we used generalized linear regression with a log-link, including multiple variables abstracted from chart review. RESULTS: Three hundred fourteen patients met inclusion criteria (12 primary or metastatic tumors, 302 OA). Fifty-eight percent of tumor patients were over the target price vs 16% of OA patients. The mean tumor patient had $40,862 for total internal hospital costs compared to $16,356 in the OA group (P < .001). Length of stay was greater in the tumor group (6.75 vs 2.0 days, P < .001). A greater percentage of tumor patients were discharged to a skilled nursing facility (67% vs 27%, P = .006) with significantly higher skilled nursing facility episode costs ($18,852 vs $7731, P = .04). With adjustment for fracture status, tumor patients were 5.36 times more likely to exceed the CJR target price than OA patients (risk ratio 5.36, confidence interval 3.44-8.35, P < .001) and 50 times more likely to be outliers over the regional threshold than OA patients (risk ratio 50.33, confidence interval 16.33-155.19, P < .001). CONCLUSION: Oncology patients enrolled in the CJR bundled payment model incur significantly higher costs and have higher cost variability than patients with OA. We recommend that oncology patients be excluded from the CJR bundle.

Complications in patients with intramedullary nails: a case series from a single Cambodian surgical clinic.

PURPOSE: Since its development in 1999, the SIGN nail has been used in over 190,000 surgeries spanning 55 countries. To date, however, evaluation of SIGN nail outcomes has been limited to small prospective studies or large retrospective studies using SIGN's online database. This study uses the experience of a single, independent Cambodian surgical clinic to characterize common complications, provide commentary on ways to reduce the risk of those complications, and determine whether several observed nail fractures were due to metallurgic defects. METHODS: Clinic medical records were queried to identify complications in patients with SIGN nails. Data was abstracted including age, sex, mechanism of injury, and latency between injury, primary implantation, and presentation with a complication. Two nails that fractured in vivo were analyzed by light microscopy, scanning electron microscopy, and polarized light microscopy after chemical etching. RESULTS: Fifty-four complications in 51 patients were identified. The most common complications were non-union (n = 26, 48%), infection (n = 16, 30%), flexion limitation (n = 11, 20%), nail fracture (n = 4, 7%), delayed union (n = 4, 7%), and malunion (n = 4, 7%). Other complications included broken or floating screws. Fractography revealed that two of the fractured nails most likely failed by fatigue followed by fast fracture at the site of non-union. We found no evidence of intrinsic nail defects. We identified multiple inconsistencies between SIGN's database and independent clinic records. CONCLUSIONS: Non-union and infection were common relative to all complications. Based on radiographic review, risk for non-union and malunion can be minimized by selecting an appropriate nail diameter, using multiple interlocking screws, and employing the correct implant and approach for fracture morphology when using SIGN nails. Nail fractures were unlikely to be caused by metallurgical flaws. Further study is necessary to determine the appropriate management of non-unions based on radiographic and clinical factors.

A Systematic Review of Systemic Cobaltism After Wear or Corrosion of Chrome-Cobalt Hip Implants.

OBJECTIVES: We sought to synthesize data on systemic arthroprosthetic cobaltism, a recently described syndrome that results from wear or corrosion of chrome-cobalt hip components. METHODS: We conducted a systematic literature review to identify all reported cases of systemic arthroprosthetic cobaltism. To assess the epidemiologic link between blood cobalt levels (B[Co]), we developed a symptom scoring tool that evaluated 9 different symptom categories and a category of medical utilization. RESULTS: We identified 25 patients reported between 2001 and 2014 with a substantial increase in case reports over the past 3 years. Symptoms were diverse and involved the hip (84%), cardiovascular system (60%), audiovestibular system (52%), peripheral motor-sensory system (48%), thyroid (48%), psychological functioning (32%), visual system (32%), and the hematological, oncological, or immune system (20%). The mean latency from implantation to presentation or revision was 41 months (range, 9-99 months). The mean B[Co] was 324 µg/L and 4 patients had levels less than 20 µg/L. The B[Co] but not blood chromium level was highly associated with a quantitative measure of overall symptom severity (r, 0.81; P < 0.001). Mean B[Co] and symptom scores were substantially higher in patients with revisions of failed ceramic-on-ceramic prostheses than those with primary metal-on-metal prostheses. CONCLUSIONS: Systemic arthroprosthetic cobaltism is an increasingly recognized complication of wear or corrosion of chrome-cobalt hip implants, may involve a large number of organ systems, and may occur with relatively low B[Co]. There is an urgent need to better define the overall scope of the problem and to develop screening and management strategies.

Predictors of increased cost and length of stay in the treatment of postoperative spine surgical site infection.

BACKGROUND CONTEXT: Although many risk factors are known to contribute to the development of a postoperative surgical site infection (SSI) following spinal surgery, little is known regarding the costs associated with the management of this complication, or the predictors for which patients will require increased resources for the management of SSI. PURPOSE: The aim of this study was to identify specific risk factors for increased treatment costs and length of stay in the management of a postoperative SSI. STUDY DESIGN/SETTING: This is a retrospective cohort study of all patients undergoing spine surgery at a single institution for 3 consecutive years. PATIENT SAMPLE: The study included 90 patients who were required to return to the operating room following spine surgery for postoperative SSI. OUTCOME MEASURES: The primary outcome measure was length of stay and hospital costs for patients with postoperative SSI following spine surgery at a single institution. METHODS: A retrospective review of all patients undergoing spine surgery at a single institution for 3 consecutive years was performed to identify patients requiring secondary surgical intervention for SSI. Demographic and financial data from both the index admission and all subsequent readmissions within 2 years of the index procedure were reviewed. Independent variables abstracted from patient records were analyzed to determine the nature and the extent of their associations with total direct hospital costs and length of stay. RESULTS: A total of 90 patients were identified that resulted in 110 readmissions, and these patients cumulatively underwent 138 irrigation and debridement (I&D) procedures for the management of postoperative spine SSI. The average length of stay for the index operation and secondary readmissions were 6.9 and 9.6 days, respectively. The mean direct cost of the treatment for SSI was $16,242. The length of stay, the number of levels fused, methicillin-resistant Staphylococcus aureus (MRSA), decreased serum albumin on readmission, and the number of I&D procedures required were significantly associated with increased treatment costs. CONCLUSIONS: Preoperative nutritional status assessment and MRSA colonization screening with targeted prophylaxis represent potentially modifiable risk factors in the treatment of SSI. Further study is needed to investigate the relationship between poor nutrition status and increased length of stay and total costs in the treatment of SSI following spine surgery.

Muscle strength and knee range of motion after femoral lengthening.

Background and purpose - Femoral lengthening may result in decrease in knee range of motion (ROM) and quadriceps and hamstring muscle weakness. We evaluated preoperative and postoperative knee ROM, hamstring muscle strength, and quadriceps muscle strength in a diverse group of patients undergoing femoral lengthening. We hypothesized that lengthening would not result in a significant change in knee ROM or muscle strength. Patients and methods - This prospective study of 48 patients (mean age 27 (9-60) years) compared ROM and muscle strength before and after femoral lengthening. Patient age, amount of lengthening, percent lengthening, level of osteotomy, fixation time, and method of lengthening were also evaluated regarding knee ROM and strength. The average length of follow-up was 2.9 (2.0-4.7) years. Results - Mean amount of lengthening was 5.2 (2.4-11.0) cm. The difference between preoperative and final knee flexion ROM was 2° for the overall group. Congenital shortening cases lost an average of 5% or 6° of terminal knee flexion, developmental cases lost an average of 3% or 4°, and posttraumatic cases regained all motion. The difference in quadriceps strength at 45° preoperatively and after lengthening was not statistically or clinically significant (2.7 Nm; p = 0.06). Age, amount of lengthening, percent lengthening, osteotomy level, fixation time, and lengthening method had no statistically significant influence on knee ROM or quadriceps strength at final follow-up. Interpretation - Most variables had no effect on ROM or strength, and higher age did not appear to be a limiting factor for femoral lengthening. Patients with congenital causes were most affected in terms of knee flexion.

Proportion of Surgical Site Infections Occurring after Hospital Discharge: A Systematic Review.

BACKGROUND: Surgical site infection (SSI) is the most common type of healthcare-associated infection, contributing to substantial annual morbidity, costs, and deaths. In the United States it is the number one reason for hospital re-admission after surgery. Relatively little attention has been paid to the proportion of SSIs that occur after discharge. This paper systematically reviews two decades of publications to characterize better the proportion of SSIs that are identified after discharge and the need for better early detection and treatment. METHODS: A restricted systematic literature search was conducted in PubMed to identify English-language studies published after 1995 that include the occurrence of pre-discharge and post-discharge SSIs. The data abstracted were the date of publication, country of origin, procedure, study design, surveillance system, population size, follow-up rate, and SSI counts and proportions. Descriptive statistics and forest plots were used to characterize the data set, represent the overall proportion of SSIs occurring after discharge, and assess the heterogeneity of the studies. RESULTS: A total of 55 articles met the inclusion criteria, with data from 1,432,293 operations and 141,347 SSIs based on studies from 15 countries. The overall proportion of operations leading to SSI was 9.9%. Of the 141,347 infections, 84,984 (60.1%) appeared after discharge. The proportion of SSIs after discharge differed among studies, from 13.5 to 94.8, and was heterogeneous for all studies and for most individual surgery types. CONCLUSION: Post-discharge SSIs constitute the majority of these infections and pose a substantial disease burden for surgical patients globally and for different surgery types. Further examination is warranted to determine the methodologic and clinical factors moderating the proportion of post-discharge SSIs.

Explant Analysis from a Patient Exhibiting Rapid Acceleration of Parkinson Disease Symptoms and Hypercobaltemia Following Metal-on-Metal Total Hip Arthroplasty: A Case Report.

CASE: A 46-year-old man developed rapidly progressing Parkinson disease symptoms after metal-on-metal total hip arthroplasty, worsening to the extent that he underwent implantation of a right subthalamic deep brain stimulator (DBS). A serum cobalt level of 116 µg/L was measured shortly after DBS implantation, and revision arthroplasty was performed using ceramic-on-polyethylene bearings. After revision, the patient's serum cobalt level fell below 1 µg/L, the Parkinson disease symptoms improved, and he reduced the DBS to its lowest setting. Explant analysis showed substantial material loss from the bearing surfaces of one hip. CONCLUSION: Future studies should evaluate the possible link between Parkinson disease symptoms and prosthesis wear-induced hypercobaltemia.

A comparison of the results of anterior cruciate ligament reconstruction using bioabsorbable versus metal interference screws: a meta-analysis.

BACKGROUND: Graft fixation during anterior cruciate ligament (ACL) reconstruction can be achieved with use of either bioabsorbable screws or metal screws. Although bioabsorbable screws and metal screws have similar fixation strengths, bioabsorbable screws eliminate the need for removal. In addition, postoperative imaging is easier to interpret when bioabsorbable screws are used. Bioabsorbable screws may be associated with an increased inflammatory response, an increased risk of screw breakage, incomplete screw absorption, or tunnel widening. We investigated the outcomes associated with the use of bioabsorbable screws as compared with metal screws for ACL reconstruction. Our hypothesis was that there is no significant difference in outcomes between these screw types for ACL reconstruction. METHODS: We systematically searched electronic databases to identify randomized controlled trials in which bioabsorbable screws were compared with metal screws for ACL reconstruction. Therapeutic studies with a minimum twelve-month mean follow-up were considered for inclusion. Clinical outcomes (International Knee Documentation Committee [IKDC], Lysholm, Tegner activity scores), laxity testing, and reported complications were evaluated in the meta-analysis. Additionally, imaging assessment of tunnel widening was evaluated. RESULTS: Eight studies matched the inclusion criteria. These studies comprised a total of 745 patients undergoing ACL reconstruction (including 378 patients managed with bioabsorbable screws and 367 patients managed with metal screws). No significant differences were identified between the two screw types with respect to IKDC, Lysholm, or Tegner activity scores or with respect to the results of laxity testing with arthrometry. The complication rates were also statistically similar in the two groups. The variability in imaging assessment of tunnel widening among the studies precluded meta-analysis. CONCLUSIONS: The clinical results associated with bioabsorbable screws and metal screws are statistically similar. Laxity evaluation demonstrated no significant differences between bioabsorbable screws and metal screws. The complication rates associated with bioabsorbable screws and metal screws were also similar. The results of this meta-analysis support the hypothesis that there are no significant differences in the outcomes associated with bioabsorbable screws as compared with metal screws for ACL reconstruction. LEVEL OF EVIDENCE: Therapeutic Level II. See Instructions to Authors for a complete description of levels of evidence.