An Innovative Seven-year Physician Scientist Residency Training Program That Addresses the Shortage of Academic Surgeons.

Due to the declining number of scientifically trained physicians and increasing demand for high-quality literature, our institution pioneered a seven-year Physician Scientist Training Program (PSTP) to provide research-oriented residents the knowledge and skills for a successful academic career. The present study sought to identify orthopaedic surgeons with MD/PhD degrees, residency programs with dedicated research tracks, and to assess the effectiveness of the novel seven-year program in training prospective academic orthopaedic surgeons. Surgeons with MD/PhD degrees account for 2.3% of all 3,408 orthopaedic faculty positions in U.S. residency programs. During the last 23 years, our PSTP residents produced 752 peer-reviewed publications and received $349,354 from 23 resident-authored extramural grants. Eleven of our seven-year alumni practice orthopaedic surgery in an academic setting. The seven-year PSTP successfully develops clinically trained surgeon scientists with refined skills in basic science and clinical experimental design, grant proposals, scientific presentations, and manuscript preparation. (Journal of Surgical Orthopaedic Advances 31(3):144-149, 2022).

Decreased Time to Return to Work Using Robotic-Assisted Unicompartmental Knee Arthroplasty Compared to Conventional Techniques.

INTRODUCTION: Unicompartmental knee arthroplasty (UKA) is a commonly used procedure for patients suffering from debilitating unicompartmental knee arthritis. For UKA recipients, robotic-assisted surgery has served as an aid in improving surgical accuracy and precision. While studies exist detailing outcomes of robotic UKA, to our knowledge, there are no studies assessing time to return to work using robotic-assisted UKA. Thus, the purpose of this study was to prospectively assess the time to return to work and to achieve the level of work activity following robotic-assisted UKA to create recommendations for patients preoperatively. We hypothesized that the return to work time would be shorter for robotic-assisted UKAs compared with TKAs and manual UKAs, due to more accurate ligament balancing and precise implementation of the operative plan. MATERIALS AND METHODS: Thirty consecutive patients scheduled to undergo a robotic-assisted UKA at an academic teaching hospital were prospectively enrolled in the study. Inclusion criteria included employment at the time of surgery, with the intent on returning to the same occupation following surgery and having end-stage knee degenerative joint disease (DJD) limited to the medial compartment. Patients were contacted via email, letter, or phone at two, four, six, and 12 weeks following surgery until they returned to work. The Baecke physical activity questionnaire (BQ) was administered to assess patients' level of activity at work pre- and postoperatively. Statistical analysis was performed using SAS Enterprise Guide (SAS Institute Inc., Cary, North Carolina) and Excel® (Microsoft Corporation, Redmond, Washington). Descriptive statistics were calculated to assess the demographics of the patient population. Boxplots were generated using an Excel® spreadsheet to visualize the BQ scores and a two-tailed t-test was used to assess for differences between pre- and postoperative scores with alpha 0.05. RESULTS: The mean time to return to work was 6.4 weeks (SD=3.4, range 2-12 weeks), with a median time of six weeks. There was no difference seen in the mean pre- and postoperative BQ scores (2.70 vs. 2.69, respectively; p=0.87). CONCLUSION: The findings of the current study suggest that most patients can return to work six weeks following robotic-assisted UKA which appears to be shorter than conventional UKA and TKA. Future level I studies are needed to verify our study findings.

An Analysis of Orthopaedic Job Trends in the United States Over the Past 30 years.

INTRODUCTION: Orthopaedic surgery residency training requires 5 clinical years; fellowship subspecialty training requires an additional year. Orthopaedic surgery fellowship training has financial implications regarding potential career earnings and opportunity cost. To evaluate the effect of fellowship training on employment, 30 years of orthopaedic job advertisements were analyzed to determine fellowship requirements for academic centers, private practices, urban areas, and rural areas. It was hypothesized that subspecialty training is an important prerequisite for orthopaedic employment. METHODS: Job advertisements in the Journal of Bone and Joint Surgery (JBJS Am) and Orthopedics were analyzed to determine whether fellowship training versus "generalist" (no subspecialty fellowship) positions were advertised for the years 1984, 1989, 1994, 1999, 2004, 2009, and 2014. Jobs were categorized as academic (defined by the requirement to teach medical students, residents, or fellows); private practice; rural (defined as population under 200,000); and urban. "General" orthopaedic surgery job postings were defined as job advertisements that did not require fellowship training. RESULTS: A total of 4,720 job advertisements were analyzed. From 1984 to 2014, the percentage of advertised jobs requiring fellowship training increased from 5% to 68% (P < 0.05). Conversely, from 1984 to 2014, the percentage of advertised jobs targeting general orthopaedic surgeons decreased from 95% to 32% (P < 0.05). Between 2009 and 2014, advertised jobs requiring fellowship surpassed general orthopaedic surgery jobs. CONCLUSIONS: Over the past 30 years, there was a trend toward fellowship being required as part of the advertised orthopaedic jobs available to graduates of orthopaedic training programs. The reasons for increased orthopaedic training are likely multifactorial, including limited clinical duty hours during orthopaedic residency, advertisement and marketing forces emphasizing super-sub-specialty care in multispecialty orthopaedic groups, and the greater complexity of orthopaedic procedures being performed.

Obesity has no effect on outcomes following unicompartmental knee arthroplasty.

PURPOSE: Although obesity has historically been described as a contraindication to UKA, improved outcomes with modern UKA implant designs have challenged this perception. The purpose of this study was to assess the influence of obesity on the outcomes of UKA with a robotic-assisted system at a minimum follow-up of 24 months with the hypothesis that obesity has no effect on robotic-assisted UKA outcomes. METHODS: There were 746 medial robotic-assisted UKAs (672 patients) with a mean age of 64 years (SD 11) and a mean follow-up time of 34.6 months (SD 7.8). Mean overall body mass index (BMI) was 32.1 kg/m2 (SD 6.5), and patients were stratified into seven weight categories according to the World Health Organization classification. RESULTS: Patient BMI did not influence the rate of revision surgery to TKA (5.8 %) or conversion from InLay to OnLay design (1.7 %, n.s.). Mean postoperative Oxford knee score was 37 (SD 11) without correlation with BMI (n.s.). The type of prosthesis (InLay/OnLay) regardless of BMI had no influence on revision rate (n.s.). BMI did not influence 90-day readmissions (4.4 %, n.s.), but showed significant correlation with higher opioid medication requirements and a higher number of physical therapy session needed to reach discharge goals (p = 0.031). CONCLUSION: These findings suggest that BMI does not influence clinical outcomes and readmission rates of robotic-assisted UKA at mid-term. The classic contraindication of BMI >30 kg/m2 may not be justified with the use of modern UKA designs or techniques. LEVEL OF EVIDENCE: IV.

An Orthopedic-Hospitalist Comanaged Hip Fracture Service Reduces Inpatient Length of Stay.

INTRODUCTION: Hip fractures are common in the elderly patients with an incidence of 320 000 fractures/year in the United States, representing a health-care cost of US$9 to 20 billion. Hip fracture incidence is projected to increase dramatically. Hospitals must modify clinical models to accommodate this growing burden. Comanagement strategies are reported in the literature, but few have addressed orthopedic-hospitalist models. An orthopedic-hospitalist comanagement (OHC) service was established at our hospital to manage hip fracture patients. We sought to determine whether the OHC (1) improves the efficiency of hip fracture management as measured by inpatient length of stay (LOS) and time to surgery (TTS) and (2) whether our results are comparable to those reported in hip fracture comanagement literature. METHODS: A comparative retrospective-prospective cohort study of patients older than 60 years with an admitting diagnosis of hip fracture was conducted to compare inpatient LOS and TTS for hip fracture patients admitted 10 months before (n = 45) and 10 months after implementation (n = 54) of the OHC at a single academic hospital. Secondary outcome measures included percentage of patients taken to surgery within 24 or 48 hours, 30-day readmission rates, and mortality. Outcomes were compared to comanagement study results published in MEDLINE-indexed journals. RESULTS: Patient cohort demographics and comorbidities were similar. Inpatient LOS was reduced by 1.6 days after implementation of the OHC (P = .01) without an increase in 30-day readmission rates or mortality. Time to surgery was insignificantly reduced from 27.4 to 21.9 hours (P = .27) and surgery within 48 hours increased from 86% to 96% (P = .15). DISCUSSION: The OHC has improved efficiency of hip fracture management as judged by significant reductions in LOS with a trend toward reduced TTS at our institution. CONCLUSION: Orthopedic-hospitalist comanagement may represent an effective strategy to improve hip fracture management in the setting of a rapidly expanding patient population.

Assessment of accuracy of robotically assisted unicompartmental arthroplasty.

PURPOSE: The purpose of this study was to analyse the accuracy of component placement during unicompartmental knee arthroplasty (UKA) using a robotic-assisted system. METHODS: Two hundred and six patients (232 knees) who underwent medial robotic-assisted UKA were retrospectively studied. Femoral and tibial sagittal and coronal alignments were measured in the post-operative radiographs and were compared with the equivalent measurements collected during the intra-operative period by the robotic system. Mismatch between pre-planning and post-operative radiography was assessed against accuracy of the prosthesis insertion. RESULTS: Robotic-assisted surgery for medial UKA resulted in an average difference of 2.2° ± 1.7° to 3.6° ± 3.3° depending on the component and radiographic view between the intra-operatively planned and post-operative measurements. Mismatch between pre-planning and post-operative radiography (inaccuracy) was related to improper cementing technique of the prosthesis in all measurements (except for tibial sagittal axis) rather than wrong bony cuts performed by the robotic arm. CONCLUSION: Robotic-assisted medial UKA results in accurate prosthesis position. Inaccuracy may be attributed to suboptimal cementing technique.

A comparison of acetate and digital templating for hip resurfacing.

This study sought to determine whether templating for metal-on-metal hip resurfacing is more accurate with digital or acetate methodology. The medical records of 102 consecutive patients who underwent hip resurfacing at our institution were retrospectively reviewed. Records lacking preoperative radiographs that included a magnification-establishing marker were excluded, leaving 78 records for study. Two investigators independently prepared acetate and digital templates of the preoperative radiographs, which had been calibrated to 120% magnification, to predict femoral and acetabular component size. Accuracy was measured by comparing the predicted component sizes to the surgically implanted component sizes. Digital templating was more accurate than acetate templating in predicting hip resurfacing component size when measuring accuracy of templates by the absolute error of predicted component sizes (femoral, P < .001; acetabular, P = .002), and by the prediction of components to +/-1 size difference (femoral, P = .001; acetabular, P = .002). Experience of the templating surgeon did not correlate with templating accuracy for acetate or digital templating. Although acetate templating is often regarded as the "gold standard" in preoperative planning, data from the current study shows that digital technology can be used for accurate preoperative templating prior to hip resurfacing procedures.

Effect of arthritis in other compartment after unicompartmental arthroplasty.

The purpose of this study is to evaluate the outcome of robotic-assisted (MAKO Surgical Corp.) unicondylar replacement in the treatment for knee osteoarthritis after the initial surgical insult is worn off to evaluate the impact of residual patellofemoral and lateral osteoarthritis on the outcome of medial unicompartmental knee replacement. One hundred and thirty-four patients who underwent uncomplicated 144 robotic-assisted medial unicondylar replacements for knee arthritis were identified and studied. Original radiographs were used to classify severity of patellofemoral and lateral compartmental osteoarthritis in these patients. Severity of patellofemoral and lateral compartmental osteoarthritis was analyzed against Oxford and Knee Society scores and amount of ipsilateral residual knee symptoms at 6 months postoperative period. Preoperative Oxford and Knee Society scores, other comorbidities and long-term disability were studied as confounding variables. We found significant improvement in symptoms and scores in spite of other compartment diseases. Poorer outcome was seen in association with comorbidities and long-term disability but not when radiographic signs of arthritis in the other compartments were present. Six patients required revision of which three had (lateral facet) patellofemoral disease in the original X-rays. In conclusion, there is a higher amount of postoperative retained symptoms, but similar outcome when there is radiographic disease in the other compartments. However, when symptoms are severe enough to necessitate revision, this is due to the lateral facet of patellofemoral compartment and not lateral compartment disease.

Distal locking using an electromagnetic field-guided computer-based real-time system for orthopaedic trauma patients.

OBJECTIVES: To compare the efficacy of distal interlocking during intramedullary nailing using a freehand technique versus an electromagnetic field real-time system (EFRTS). DESIGN: A prospective, randomized controlled trial. SETTING: Level I academic trauma center. PATIENTS/PARTICIPANTS: Patients older than 18 years who sustained a femoral or tibial shaft fracture amenable to antegrade intramedullary nailing were prospectively enrolled between August 2010 and November 2011. Exclusion criteria included injuries requiring retrograde nailing and open wounds near the location of the distal interlocks (distal third of the femur, knee, or distal tibia). INTERVENTION: Each patient had 2 distal interlocking screws placed: one using the freehand method and the other using EFRTS. MAIN OUTCOME MEASUREMENT: Techniques were compared on procedural time and number of interlocking screw misses. Two time points were measured: time 1 (time to find perfect circles/time from wand placement to drill initiation) and time 2 (drill initiation until completion of interlocking placement). RESULTS: Twenty-four tibia and 24 femur fractures were studied. EFRTS proved faster at times 1 and 2 (P < 0.0001 and P < 0.0002) and total time (P < 0.0001). This difference was larger for junior residents, though reached statistical significance for senior residents. Senior residents were faster with the freehand technique compared with junior residents (P < 0.004), but the 2 were similar using EFRTS (P = 0.41). The number of misses was higher with free hand compared with EFRTS (P = 0.02). CONCLUSION: These results suggest that EFRTS is faster than the traditional freehand technique and results in fewer screw misses. LEVEL OF EVIDENCE: Therapeutic Level II. See Instructions for Authors for a complete description of levels of evidence.

Current controversies in partial knee arthroplasty.

Partial knee arthroplasty has enjoyed renewed interest during the past decade. It is helpful to be familiar with the classic and current indications, contraindications, and technical aspects of partial knee arthroplasty, including patellofemoral, medial unicompartmental, and lateral unicompartmental knee arthroplasty. Various implant choices for partial knee arthroplasty can be compared and evaluated based on patient characteristics, design qualities, and reported outcomes. It is also helpful to review the indications and techniques for performing medial or lateral unicompartmental knee arthroplasty in combination with arthroscopically assisted reconstruction of the anterior cruciate ligament.

Does a plastic drape reduce incidence of heterotopic ossification after hip resurfacing?

BACKGROUND: High rates of heterotopic ossification have been associated with hip resurfacing as compared to THA. Bone debris from femoral head reamings is cited as one of the risk factors linked to increased rates of heterotopic ossification. QUESTIONS/PURPOSES: We therefore asked whether (1) the incidence of heterotopic ossification differed with and without the use of a plastic drape used to collect bone debris and (2) any of a number of variables (age, gender, diagnosis, previous hip surgery, operative time, and blood loss) related to the occurrence of HO. METHODS: We retrospectively reviewed 136 hip resurfacings performed using one of two techniques: Group 1 contained 64 hip resurfacings performed using a sterile drape around the femoral neck while reaming the femoral head to collect bone debris; Group 2 contained 72 hip resurfacings carried out with manually removing bone debris and utilizing a pulse lavage. Data were collected with respect to diagnosis, gender, previous surgery, postoperative complications, operative time, and blood loss to rule out confounding variables. The amount of heterotopic ossification was measured radiographically in hips after undergoing resurfacing arthroplasty. The minimum followup was 6 months (mean, 15 months; range, 6-27 months). RESULTS: No patient had heterotopic ossification of clinical importance and none had resection of the heterotopic ossification. Group 1 had a lower overall incidence of minor heterotopic ossification (32%) than Group 2 (58%). Risk factors linked to heterotopic ossification include male gender and operative time. CONCLUSIONS: The use of a plastic drape to collect bone debris from femoral head reamings decreased the incidence of heterotopic ossification in resurfacing arthroplasty of the hip.

Hip resurfacing-keys to success.

In recent years, metal-on-metal hip resurfacing has become an increasingly popular treatment for patients needing hip arthroplasty. Important factors to consider for a successful outcome include proper patient selection and surgical technique, including approach, component positioning, and cementing technique. This review will serve as guide to both those who are learning the technique of hip resurfacing and to more experienced surgeons.

Computer-assisted navigation in hip resurfacing arthroplasty - a single-surgeon experience.

Hip resurfacing arthroplasty is a technically challenging procedure, and orientation of the femoral component is critical to avoid implant failure. The use of computer-assisted navigation has been shown to decrease the learning curve for beginners in hip resurfacing and to improve the surgeon's ability to produce consistent results. Computer navigation offers real-time feedback, with the opportunity to produce improved repeatability to optimize patient outcomes. The purpose of this study was to evaluate the learning curve of computer-assisted surgery in the hands of an experienced hip resurfacing surgeon. A retrospective review of 100 consecutive navigated hip resurfacing arthroplasties in 94 patients assessed preoperative and postoperative neck-shaft angles, operative times, and complications. Twenty-five non-navigated hip resurfacing arthroplasties, performed by the same surgeon, were evaluated as a matching group. Mean operative times for the computer-assisted hip resurfacing were 101 minutes, as compared to 104 minutes in the non-navigated group. We found that in the hands of an experienced hip resurfacing surgeon, the addition of computer-assisted navigation had no effect on the learning curve, but did provide feedback and repeatability to the surgeon.

Instability after total hip arthroplasty: treatment with large femoral heads vs constrained liners.

One of the most common complications after total hip arthroplasty is instability. This study reviewed the recent literature concerning the indications, contraindications, and results of recent studies using both constrained liners and large femoral heads to treat instability after total hip arthroplasty. We also report on the results of a series of 41 patients (52 hips) considered being at high risk for dislocation who were treated with large-diameter metal-on-metal bearings and who were compared with a matched group of hips treated with standard-size metal-on-polyethylene bearings. The large-diameter femoral head group had no dislocations at a minimum follow-up of 24 months, whereas the standard-size group had 2 dislocations. We support the use of large femoral heads to treat instability in a wide variety of patients because of the increased stability, decreased wear of modern metal-on-metal designs, increased range of motion, and variety of revision options.

Does computer-assisted surgery improve accuracy and decrease the learning curve in hip resurfacing? A radiographic analysis.

BACKGROUND: Hip resurfacing is a technically demanding procedure in which accurate positioning of the femoral component is critical to the avoidance of early implant failures. The purpose of this study was to assess the accuracy of computer-assisted placement of the femoral component and to evaluate the impact of computer-assisted surgery on the learning curve associated with this procedure. METHODS: The accuracy of positioning the femoral component was analyzed radiographically in hips undergoing resurfacing procedures performed by surgeons assigned to four different study groups: Group 1, in which the operations were performed with use of computer-assisted surgery by a fellowship-trained surgeon who was experienced in performing resurfacing arthroplasty (surgical experience, more than 250 hip resurfacings); Group 2, in which the operations were performed with use of computer-assisted surgery by senior residents who were inexperienced in performing resurfacing arthroplasty and who were closely supervised by faculty; Group 3, in which the operations were performed with use of conventional instruments by fellowship-trained faculty members; and Group 4, in which the operations were performed with use of computer-assisted surgery by a lesser experienced fellowship-trained faculty member (surgical experience, more than forty but less than seventy-five hip resurfacings) from Group 3. RESULTS: The range of error in varus or valgus angulation that was observed for navigated procedures was 6 degrees in Group 1, 7 degrees in Group 2, and 5 degrees in Group 4. Compared with the preoperative neck-shaft angle value, the mean postoperative stem-shaft angle value increased by a mean of 4.7 degrees in Group 1, 7.2 degrees in Group 2, 6.5 degrees in Group 3, and 11.6 degrees in Group 4. When compared with the use of standard instrumentation, the use of computer-assisted surgery reduced the number of outliers and facilitated valgus insertion. CONCLUSIONS: In the present study, computer-assisted surgery resulted in improved accuracy and precision in positioning the femoral component. In addition, computer-assisted surgery led to a reduction in the length of the learning curve for beginners in hip resurfacing and improved the surgeon's ability to perform this procedure safely.

Femoral neck fractures after metal-on-metal total hip resurfacing: a prospective cohort study.

There has been a renewed interest in metal-on-metal resurfacing total hip arthroplasty. Recent studies have reported high success rates at short to midterm follow-up. Despite these excellent early outcomes, femoral neck fractures have been reported as a major complication after this procedure. The purpose of this study was to identify the incidence of this complication in a prospective cohort of patients. In addition, various demographic and radiographic factors such as surgeon experience, age, sex, body mass index, femoral neck notching, and cysts were assessed as potential risk factors. Between November 2000 and August 2006, 550 metal-on-metal total hip resurfacings were performed by a single surgeon. The absolute risk for femoral neck fracture in this cohort was 2.5%. Of the 14 fractures, 12 occurred in the first 69 resurfacings performed. After this time, the incidence of fracture was 0.4%. Women and obese patients were shown to have higher cumulative incidences of fractures. These findings suggest the need for careful patient selection and surgical technique, especially for surgeons during the early learning curve for this technically difficult surgery.