Failure of humeral shaft fixation: construct characteristics.

PURPOSE: Fixation failure following open reduction and internal fixation (ORIF) of humeral shaft fractures can be a challenging complication. We aimed to identify the modes of failure and characteristics of failed fixation constructs. METHODS: We queried our institutional database for patients > 18 years old with fixation failure after ORIF with single plate and screw constructs of humeral shaft fractures from 2006 to 2017. Demographics, fracture characteristics, fixation construct design and mode of failure were recorded. RESULTS: Twenty-three failures were identified. Mean age was 55.9 years (SD 19.2 years) with 15 (65%) women. Twelve patients (52%) had midshaft fractures; the remainder had distal-third shaft (8 pts, 35%) or proximal-third shaft (3 pts, 13%) fractures. Midshaft fractures were most commonly fixed through an anterolateral approach with plates and all non-locking screws (83%), while distal-third shaft fractures were fixed with a combination of locking and non-locking screws from a posterior approach. Distal-third shaft fractures failed by plate breakage (63%) or screw pullout (38%) and all midshaft failures occurred by screw pullout proximal (92%) or distal (8%) to the fracture. Resultant varus deformity occurred in 20 (87%) fractures. CONCLUSION: Screw pullout in midshaft fractures suggests that fixation to bone was insufficient or biomechanically disadvantageous. Varus moments contribute significantly to the failure of humeral shaft fracture ORIF. Plate breakage in distal fractures suggests high concentrations of stress over a narrow working length of constructs with inadequate plate strength. Recognizing how these constructs fail can aid proper implant selection and application for humeral shaft fracture. LEVEL OF EVIDENCE: Treatment level IV.

Antegrade Fixation of Distal Metaphyseal Ulnar Shortening Osteotomy.

The ulnar shortening osteotomy (USO) is a common procedure used to treat ulnar impaction syndrome secondary to static or dynamic ulnar-positive variance. There are many described techniques for the USO. The distal metaphyseal ulnar shortening osteotomy (DMUSO) with retrograde cannulated screw fixation was described to reduce complications seen with other techniques. Biomechanical analysis of fixation constructs demonstrates 2-screw constructs are significantly stiffer than 1 screw and antegrade constructs have similar or greater stiffness when compared with retrograde constructs. Here, we describe a technique of antegrade cannulated screw fixation for DMUSO that obviates the need for the disruption of the distal radioulnar joint for intra-articular exposure of the ulnar head. Similar to the traditional retrograde DMUSO technique, this construct may also decrease the risk of delayed union, symptomatic implants associated with diaphyseal osteotomies, and disruption of triangular fibrocartilaginous complex in wafer procedures.

Is Hand Surgery in the Procedure Room Setting Associated With Increased Surgical Site Infection? A Cohort Study of 2,717 Patients in the Veterans Affairs Population.

PURPOSE: Procedure rooms (PRs) are increasingly used for hand surgeries, but few studies have directly compared surgical site infection (SSI) rates between the PR and operating room. We tested the hypothesis that procedure setting is not associated with an increased SSI incidence in the VA population. METHODS: We identified carpal tunnel, trigger finger, and first dorsal compartment releases performed at our VA institution from 1999 to 2021 of which 717 were performed in the main operating room and 2,000 were performed in the PR. The incidence of SSI, defined as signs of wound infection within 60 days of the index procedure, which was treated with oral antibiotics, intravenous antibiotics, and/or operating room irrigation and debridement, was compared. We constructed a multivariable logistic regression analysis to assess the association between procedure setting and SSI incidence, adjusting for age, sex, procedure type, and comorbidities. RESULTS: Surgical site infection incidence was 55/2,000 (2.8%) in the PR cohort and 20/717 (2.8%) in the operating room cohort. In the PR cohort, five (0.3%) cases required hospitalization for intravenous antibiotics of which two (0.1%) cases required operating room irrigation and debridement. In the operating room cohort, two (0.3%) cases required hospitalization for intravenous antibiotics of which one (0.1%) case required operating room irrigation and debridement. All other SSIs were treated with oral antibiotics alone. The procedure setting was not independently associated with SSI (adjusted odds ratio, 0.84 [95% confidence interval, 0.49, 1.48]). The only risk factor for SSI was trigger finger release (odds ratio, 2.13 [95% confidence interval, 1.32, 3.48] compared with carpal tunnel release), which was independent of setting. CONCLUSIONS: Minor hand surgeries can be performed safely in the PR without an increased rate of SSI. TYPE OF STUDY/LEVEL OF EVIDENCE: Prognostic II.

Distal Metaphyseal Ulnar Shortening Osteotomy Fixation: A Biomechanical Analysis.

PURPOSE: Ulnar shortening osteotomy can be used to treat ulnar impaction syndrome and other causes of ulnar wrist pain. Distal metaphyseal ulnar shortening osteotomy (DMUSO) is one technique that has been proposed to reduce the complications seen with a diaphyseal USO or a wafer resection. However, to our knowledge, the optimal fixation construct for DMUSO has not been studied. We sought to characterize the biomechanical stiffness and rotational stability of different DMUSO constructs. METHODS: A DMUSO was performed on 40 human cadaveric ulnas using 4 different fixation constructs (10 specimens per group): one 3.0 mm antegrade screw; two 2.2 mm antegrade screws; one 3.0 mm retrograde screw; and two 2.2 mm retrograde screws. Biaxial testing using axial load and cyclical axial torque was performed until failure, defined as 10° of rotation or 2 mm displacement. Specimens were assessed for stiffness at failure. Bone density was assessed using the second metacarpal cortical percentage. RESULTS: Bone density was similar between all 4 testing groups. Of the 4 groups, the 2 antegrade screw group exhibited the highest rotational stiffness of 232 ± 102 Nm/deg. In paired analysis, this was significantly greater than 1 retrograde screw constructs. In multivariable analysis, 2-screw constructs were significantly stiffer than 1 screw and antegrade constructs were significantly stiffer than retrograde. Maximum failure torque did not differ with orientation, but 2 screws failed at significantly higher torques. CONCLUSION: Using 2 screws for DMUSO fixation constructs may provide higher stiffness and maximum failure torque, and antegrade screw constructs may provide more stiffness than retrograde constructs. CLINICAL RELEVANCE: Antegrade screw fixation using 2 screws may provide the strongest construct for DMUSO. Antegrade fixation may be preferred because it avoids violating the distal radioulnar joint capsule and articular surface of the ulna.

Radiocarpal Fusion: Indications, Technique, and Modifications.

Degenerative disorders of the wrist may affect isolated joints and inhibit normal functions of the wrist secondary to pain and stiffness. These processes that affect only the radiocarpal joint may be secondary to posttraumatic osteoarthritis, primary osteoarthritis, or rheumatoid arthritis. Radiocarpal wrist arthrodesis may help preserve some of the native wrist kinematics while alleviating pain and improving the range of motion. However, the surgeon must ensure that the patient's pathologic process primarily affects the radiocarpal articulations while relatively sparing the midcarpal articulations. Depending on the location of the pathology, isolated radiolunate or radioscapholunate arthrodesis have been described to preserve some motion in the midcarpal joint. To maximize motion in the midcarpal joint after radiocarpal arthrodesis, techniques for distal scaphoid and triquetrum excision have been described. We report patient outcomes for various techniques and describe our preferred technique for radioscapholunate arthrodesis using distal scaphoid excision.

Is Opioid-Limiting Legislation Effective for Hand Surgery Patients?

BACKGROUND: The Rhode Island State Legislature passed the Uniform Controlled Substances Act in 2016 to limit opioid prescriptions. We aimed to objectively evaluate its effect on opioid prescribing for hand surgery patients and also identify risk factors for prolonged opioid use. METHODS: A 6-month period (January-June 2016) prior to passage of the law was compared with a period following its implementation (July-December 2017). Thumb carpometacarpal arthroplasty and distal radius fracture fixation were classified as "major surgery" and carpal tunnel and trigger finger release as "minor surgery." Prescription Drug Monitoring Database was used to review controlled substances filled during the study periods. RESULTS: A total of 1380 patients met our inclusion criteria, with 644 prelaw and 736 postlaw patients. Patients undergoing "major surgery" saw a significant decrease in the number of pills issued in the first postoperative prescription (41.1 vs 21.0) and a corresponding decrease in morphine milligram equivalents (MMEs) (318.6 vs 159.2 MMEs) after implementation. A 30% decrease in MMEs was also seen in those undergoing "major surgery" in the first 30 days postoperatively (544.7 vs 381.7 MMEs). Risk factors for prolonged opioid use included male sex and preoperative opioid use. CONCLUSIONS: In Rhode Island, opioid-limiting legislation resulted in a significant decrease in the number of pills and MMEs of the initial prescription and a 30% decrease in total MMEs in the 30-day postoperative period after "major hand surgery." Additional research is needed to explore the association between legislation and clinical outcomes.

Suture Anchor Versus Transosseous Tunnel Repair for Inferior Pole Patellar Fractures Treated With Partial Patellectomy and Tendon Advancement: A Biomechanical Study.

BACKGROUND: Comminuted inferior pole patellar fractures can be treated in numerous ways. To date, there have been no studies comparing the biomechanical properties of transosseous tunnels versus suture anchor fixation for partial patellectomy and tendon advancement of inferior pole patellar fractures. HYPOTHESIS: Suture anchor repair will result in less gapping at the repair site. We also hypothesize no difference in load to failure between the groups. STUDY DESIGN: Controlled laboratory study. METHODS: Ten cadaveric knee extensor mechanisms (5 matched pairs; patella and patellar tendon) were used to simulate a fracture of the extra-articular distal pole of the patella. The distal simulated fracture fragment was excised, and the patellar tendon was advanced and repaired with either transosseous bone tunnels through the patella or 2 single-loaded suture anchors preloaded with 1 suture per anchor. Load to failure and elongation from cycles 1 to 250 between 20 and 100 N of force were measured, and modes of failure were recorded. Statistical analysis was performed using a paired 2-tailed Student t test. RESULTS: The suture anchor group had less gapping during cyclic loading as compared with the transosseous tunnel group (mean ± SD, 6.83 ± 2.23 vs 13.30 ± 5.74 mm; P = .047). There was no statistical difference in the load to failure between the groups. The most common mode of failure was at the suture-anchor interface in the suture anchor group (4 of 5) and at the knot proximally on the patella in the transosseous tunnel group (4 of 5). CONCLUSION: Suture anchors yielded similar strength profiles and less tendon gapping with cyclic loading when compared with transosseous tunnels in the treatment of comminuted distal pole of the patellar fractures managed with partial patellectomy and patellar tendon advancement. CLINICAL RELEVANCE: Suture anchors may offer robust repair and earlier range of motion in the treatment of fractures of the distal pole of the patella. Clinical randomized controlled trials would help clinicians better understand the difference in repair techniques and confirm the translational efficacy in clinical practice.

Total Wrist Arthroplasty Alignment and Its Potential Association with Clinical Outcomes.

Purpose There is a lack of quantitative research that describes the alignment and, more importantly, the effects of malalignment on total wrist arthroplasty (TWA). The main goal of this pilot study was to assess the alignment of TWA components in radiographic images and compare them with measures computed by three-dimensional analysis. Using these measures, we then determined if malalignment is associated with range of motion (ROM) or clinical outcomes (PRWHE, PROMIS, QuickDash, and grip strength). Methods Six osteoarthritic patients with a single type of TWA were recruited. Radiographic images, computed tomography images, and clinical outcomes of the wrists were recorded. Using posteroanterior and lateral radiographs, alignment measurements were defined for the radial and carpal components. Radiographic measurements were validated with models reconstructed from computed tomography images using Bland-Altman analysis. Biplanar videoradiography (<1mm and <1 degree accuracy) was used to capture and compute ROM of the TWA components. Linear regression assessed the associations between alignment and outcomes. Results Radiographic measures had a 95% limit-of-agreement (mean difference ± 1.96 × SD) of 3 degrees and 3mm with three-dimensional values, except for the measures of the carpal component in the lateral view. In our small cohort, wrist flexion-extension and radial-ulnar deviation were correlated with volar-dorsal tilt and volar-dorsal offset of the radial component and demonstrated a ROM increase of 3.7 and 1.6 degrees per degree increase in volar tilt, and 10.8 and 4.2 degrees per every millimeter increase in volar offset. The carpal component's higher volar tilt was also associated with improvements in patient-reported pain. Conclusions We determined metrics describing the alignment of TWA, and found the volar tilt and volar offset of the radial component could potentially influence the replaced wrist's ROM. Clinical Relevance TWA component alignment can be measured reliably in radiographs, and may be associated with clinical outcomes. Future studies must evaluate its role in a larger cohort.

Biomechanics of the Distal Radioulnar Joint During In Vivo Forearm Pronosupination.

Background Ulnar variance (UV) and center of rotation (COR) location at the level of the distal radioulnar joint (DRUJ) change with forearm rotation. Nevertheless, these parameters have not been assessed dynamically during active in vivo pronosupination. This assessment could help us to improve our diagnosis and treatment strategies. Questions/purposes We sought to (1) mathematically model the UV change, and (2) determine the dynamic COR's location during active pronosupination. Methods We used biplanar videoradiography to study DRUJ during in vivo pronation and supination in nine healthy subjects. UV was defined as the proximal-distal distance of ulnar fovea with respect to the radial sigmoid notch, and COR was calculated using helical axis of motion parameters. The continuous change of UV was evaluated using a generalized linear regression model. Results A second-degree polynomial with R 2 of 0.85 was able to model the UV changes. Maximum negative UV occurred at 38.0 degrees supination and maximum positive UV occurred at maximum pronation. At maximum pronation, the COR was located 0.5 ± 1.8 mm ulnarly and 0.6 ± 0.8 mm volarly from the center of the ulnar fovea, while at maximum supination, the COR was located 0.2 ± 0.6 mm radially and 2.0 ± 0.5 mm volarly. Conclusion Changes in UV and volar translation of the COR are nonlinear at the DRUJ during pronosupination. Clinical Relevance Understanding the dynamic nature of UV as a function of pronosupination can help guide accurate evaluation and treatment of wrist pathology where the UV is an important consideration. The dynamic behavior of COR might be useful in designing DRUJ replacement implants to match the anatomical motion.

In vivo articular contact pattern of a total wrist arthroplasty design.

Total wrist arthroplasty (TWA) designs suffer from relatively high complication rates when compared to other arthroplasties. Understanding the contact pattern of hip and knee replacement has improved their design and function; however, the in vivo contact pattern of TWA has not yet been examined and is thus the aim of this study. We hypothesized that the center of contact (CoC) is located at the geometric centers of the carpal component and radial component in the neutral posture and that the CoC moves along the principal arcs of curvature throughout primary anatomical motions. Wrist motion and implant kinematics of six patients with the Freedom® total wrist implant were studied during various tasks using biplanar videoradiography. The location of the CoC of the components was investigated by calculating distance fields between the articular surfaces. We found the CoC at the neutral posture was not at the geometric centers but was located 3.5 mm radially on the carpal component and 1.2 mm ulnarly on the radial component. From extension to flexion, the CoC moved 10.8 mm from dorsal to volar side on the carpal component (p < 0.0001) and 7.2 mm from volar to dorsal on the radial component (p = 0.0009). From radial to ulnar deviation, the CoC moved 12.4 mm from radial to ulnar on the carpal component (p < 0.0001), and 5.6 mm from ulnar to radial on the radial component (p = 0.009). The findings of this study may eventually improve TWA success by advancing future designs through a more accurate understating of their kinematic performance in vivo.

Parenthood Among Orthopedic Surgery Residents: Assessment of Resident and Program Director Perceptions on Training.

Orthopedic residency training overlaps with common childbearing ages. The purpose of this study was to describe factors affecting male and female residents' family-planning decisions and attitudes of program directors (PDs) toward parenthood during residency. In 2018, using an anonymous survey model, residents and PDs in Accreditation Council for Graduate Medical Education-accredited orthopedic surgery programs were asked about their perceptions of parenthood on training, the availability of family-oriented services at their programs, and the effect of residency culture and policies on their decision to have children. This survey occurred in 2018. Three hundred forty-nine (76.2%) of 458 resident respondents were male and 109 (23.8%) were female. Two hundred four (49.9%) of 409 residents were unsure of their program's parental leave policy. Male residents reported taking an average of 0.8 weeks (95% CI, 0.0-4.0 weeks) of parental leave and females an average of 4.6 weeks (95% CI, 2.0-6.5 weeks) (P<.001). Female residents were more likely to report delaying having children during residency (56.73% vs 38.71%, P=.001) and were more likely to cite reputational concerns (57.63% vs 0.76%, P<.001) and effects on career opportunities (42.37% vs 7.57%, P<.001) as reasons for delaying parenthood. The most commonly cited negative effect of parenthood on residency training by PDs was reduction in off-duty educational time (15 of 29, 51.72%). Twenty-four (80%) of 30 PDs believe that training may need to be extended based on amount of maternity/paternity leave time taken off. Although parenthood during orthopedic training is common, both male and female residents reported delaying parenthood because of residency-related factors. Improved clarification of leave policies and establishment of clear guidelines for parenthood in residency may improve resident wellness. [Orthopedics. 2021;44(2):98-104.].

Distal Radioulnar Joint Instability: Assessment of Three Intraoperative Radiographic Stress Tests.

Background: The purpose of this study is to describe three radiographic stress tests that could be used to examine for distal radioulnar joint (DRUJ) instability intraoperatively, and to determine their ability to detect DRUJ instability after sequentially sectioning the DRUJ. Methods: Eleven fresh frozen cadaveric upper extremities (mean age 52.6 ± 14.9 years) were obtained. We sequentially sectioned the DRUJ. After each component of the DRUJ was sectioned, we performed three radiographic stress tests-squeeze test, ulnar pull in coronal plane, and simulated DRUJ ballotment test. Results: The squeeze test detected a significant increase in diastasis relative to the intact DRUJ after sectioning of the foveal insertion of the triangular fibrocartilage complex (TFCC; 1.0 mm) and the distal oblique bundle (DOB; 1.2 mm). The ulnar pull test in the coronal plane detected a significant increase in diastasis relative to the intact DRUJ after sectioning of the dorsal and volar radioulnar ligaments (2 mm), the foveal insertion of the TFCC (2.6 mm), and the DOB (4.4 mm). The simulated DRUJ ballotment test detected a significant increase in dorsal translation of the ulna relative to the intact DRUJ with sectioning of the foveal insertion of the TFCC (4.9 mm) and the DOB (5.6 mm). Conclusion: The squeeze test and simulated DRUJ ballotment test detect a significant increase in diastasis after the foveal attachment of the TFCC was sectioned. The ulnar pull test in the coronal plane was the most sensitive test for detecting a significant increase in diastasis relative to the intact DRUJ.

Larger Initial Opioid Prescriptions Following Total Joint Arthroplasty Are Associated with Greater Risk of Prolonged Use.

BACKGROUND: The ongoing U.S. opioid epidemic threatens quality of life and poses substantial economic and safety burdens to opioid abusers and their communities, physicians, and health-care systems. Public health experts have argued that prescription opioids are implicated in this epidemic; however, opioid dosing following surgical procedures remains controversial. The purpose of this study was to evaluate the relationship between initial opioid prescribing following total hip arthroplasty (THA) and total knee arthroplasty (TKA) and the risk and quantity of long-term opioid use. METHODS: Patients undergoing THA or TKA from January 1, 2016, to June 30, 2016, were identified. Preoperative 30-day opioid and benzodiazepine exposures were evaluated using the Rhode Island Prescription Drug Monitoring Program. Cumulative morphine milligram equivalents (MMEs) in the postoperative inpatient stay, initial outpatient opioid prescription, and prescriptions filled from 31 to 90 days (prolonged use) and 91 to 150 days (chronic use) following the surgical procedure were calculated. Regression analyses evaluated the association between the initial postoperative opioid dosing and prolonged or chronic use, controlling for demographic characteristics, procedure, preoperative opioid and benzodiazepine exposures, anesthesia type, and use of a peripheral nerve block. RESULTS: A total of 507 patients (198 who underwent a THA and 309 who underwent a TKA) were identified. Increased inpatient opioid dosing (odds ratio [OR], 1.49 per 1 standard deviation increase in inpatient opioid MMEs; p = 0.001) and increased dosing in the first outpatient prescription (OR, 1.26 per 1 standard deviation increase in initial outpatient prescription MMEs; p = 0.049) were each independently associated with an increased risk of prolonged opioid use. Additionally, increased inpatient dosing postoperatively was strongly associated with a greater risk of chronic use (OR, 1.77 per 1 standard deviation increase in inpatient MMEs; p < 0.001). Among the 30% (151 of 507) of patients requiring prolonged postoperative opioids, each 1-MME increase in the initial outpatient prescription dose was associated with a 0.997-MME increase in quantity filled during the prolonged period (p < 0.001). Among the 14% (73 of 507) of patients requiring chronic opioids, every 1-MME increase in the initial outpatient dose was associated with a 1.678-MME increase in chronic opioid dosing (p = 0.008). CONCLUSIONS: Increased opioid dosing in the early postoperative period following total joint arthroplasty (TJA) is associated with an increased risk of extended opioid use. A dose-dependent relationship between initial outpatient dosing and greater future quantities consumed by those with prolonged usage and those with chronic usage was noted. This study suggests that providers should attempt to minimize inpatient and early outpatient opioid utilization following TJA. Multimodal pain management strategies may be employed to assist in achieving adequate pain control while minimizing opioid utilization. LEVEL OF EVIDENCE: Therapeutic Level IV. See Instructions for Authors for a complete description of levels of evidence.

Measurement of the coracohumeral distance on magnetic resonance imaging in a large patient cohort.

BACKGROUND: Coracoid impingement syndrome is an increasingly recognized etiology of anterior shoulder pain. Numerus studies have documented the coracohumeral distance (CHD) as a primary or secondary measurement in symptomatic individuals, but there lacks an evaluation of CHD in a large cohort of asymptomatic individuals. The purpose of this study was to quantify a normative distribution of the CHD in a large cohort of healthy, asymptomatic subjects with no history of impingement or shoulder instability. METHODS: Incoming first-year students in the United States Military Academy were offered enrollment in this study as part of a prospective cohort to assess the normal anatomic relationships of the shoulder girdle. Magnetic resonance images were obtained, and a board-certified, fellowship-trained musculoskeletal radiologist performed measurements of the smallest distance from the coracoid to the humeral head on axial images. RESULTS: Magnetic resonance images of 714 subjects were available for analysis, including 630 males and 84 females, with a total of 1120 individual shoulders with images of adequate quality. The mean CHD for all shoulders imaged was 13.7 mm. The mean CHD in male shoulders was 13.8 mm, and in female subjects the average was 12.4 mm. CONCLUSIONS: This study is the largest of its kind to evaluate the CHD in asymptomatic, healthy shoulders to date and demonstrates a mean CHD of 13.7 mm for all subjects. This information can help to standardize "normal" ranges and act as a comparison for future work, when taken in the context of age and imaging in neutral rotation.

Gorham Disease Limited to the Left Upper Extremity Without Hand Involvement.

In this case report, we present a young female patient with a history of Gorham disease, who sustained pathologic fractures of the left radius and ulna after a low-impact fall. Massive osteolysis of the left forearm and wrist was noted on plain radiographs. The patient had had 8 previous left upper-extremity fractures without evidence of disease in any other area of the body.

Concussion: Mechanisms of Injury and Trends from 1997 to 2019.

BACKGROUND: There is limited long-term epidemiological data focused on concussions in the United States. METHODS: The National Electronic Injury Surveillance System was queried from 1997 to 2019 for concussion diagnoses. National incidence rates, stratified by age and sex, were estimated. Injury mechanisms were ranked. RESULTS: From 1997 to 2019, there was a 3-fold increase in the diagnosis of concussion from 82,103 (95% CI 77,650-86,555) in 1997 to 261,722 (95% CI 212,156-311,288) in 2019 (p<0.001). Fall-related head-injury mechanisms were most common in very young (<5 year old) and older (>65 year old) patients. Sports-related injuries were most common in those age 5-24 years old. CONCLUSIONS: It remains unclear if the observed two-decade rise in reported concussions represents a true increase in incidence or is indicative of improvements in early detection, diagnosis, and treatment during this time period. Common injury mechanisms described highlight the need for improved age-specific safety recommendations.

Orthopaedic Surgery Faculty: An Evaluation of Gender and Racial Diversity Compared with Other Specialties.

BACKGROUND: The American Academy of Orthopaedic Surgeons has adopted the strategic goal of evolving its culture and governance to become more strategic, innovative, and diverse. Given the charge to increase diversity, a focus on assessing and increasing diversity at the faculty level may help this cause. However, an analysis of gender and racial diversity among orthopaedic faculty has not been performed. The purpose of this study was to evaluate faculty appointments for underrepresented minority (URM) and female orthopaedic surgeons. We also aim to draw comparisons between orthopaedic surgery and other specialties. METHODS: Data on gender, race, and faculty rank (clinical instructor, assistant professor, associate professor, and professor) of academic faculty for 18 specialties from 1997 to 2017 were obtained from the Association of American Medical Colleges (AAMC) Faculty Roster. Assistant professors were designated as junior faculty, whereas associate professor and professor were considered senior faculty. URMs were defined using the AAMC definition-groups having lower representation than in the general population. Regression analysis was used to evaluate and compare the change over time and to compare the change across different specialties. RESULTS: Over the 20-year study period, the number of female faculty increased (8.8% pts) but represents a lower proportion than other specialties (13.9% pts) (p = 0.029). Female orthopaedic senior faculty grew slower (7.3% pts) than other specialties (14.7% pts) (p < 0.001). There was no difference in the growth of URM faculty positions (2.0% pts) compared with all other specialties (2.4% pts) (p = 0.165). The proportion of orthopaedic URM senior faculty increased less (0.5% pts) than other specialties (2.5% pts) (p < 0.001), whereas more orthopaedic URM junior faculty were added than other specialties (2.2% pts) (p = 0.012). CONCLUSIONS: Although orthopaedic surgery has increased the representation of female and URM faculty members, it continues to lag behind other specialties. In addition, fewer female and URM orthopaedic faculty members obtained senior faculty status than other specialties. To address the differences seen in faculty diversity, a concerted effort should be made to recruit and promote more diverse faculty, given similar qualifications and capabilities. LEVEL OF EVIDENCE: Prognostic Level IV.

Proximal-distal shift of the center of rotation in a total wrist arthroplasty is more than twice of the healthy wrist.

Reproduction of healthy wrist biomechanics should minimize the abnormal joint forces that could potentially result in the failure of a total wrist arthroplasty (TWA). To date, the in vivo kinematics of TWA have not been measured and it is unknown if TWA preserves healthy wrist kinematics. Therefore, the purpose of this in vivo study was to determine the center of rotation (COR) for a current TWA design and to compare its location to the healthy wrist. The wrist COR for six patients with TWA and 10 healthy subjects were calculated using biplane videoradiography as the subjects performed various range-of-motion and functional tasks that included coupled wrist motions. An open-source registration software, Autoscoper, was used for model-based tracking and kinematics analysis. It was demonstrated that the COR was located near the centers of curvatures of the carpal component for the anatomical motions of flexion-extension and radial-ulnar deviation. When compared to healthy wrists, the COR of TWAs was located more distal in both pure radial deviation (P < .0001) and pure ulnar deviation (P = .07), while there was no difference in its location in pure flexion or extension (P = .99). Across all coupled motions, the TWA's COR shifted more than two times that of the healthy wrists in the proximal-distal direction (17.1 vs 7.2 mm). We postulate that the mismatch in the COR location and behavior may be associated with increased loading of the TWA components, leading to an increase in the risk of component and/or interface failure.