Radiocapitellar and Ulnotrochlear Pressures Increase in a Radial Head Fracture Model: A Cadaveric Biomechanical Analysis.

BACKGROUND: Changes in intra-articular pressure have not been previously described in relation to the management of radial head fractures. We hypothesized that pressure within the radiocapitellar and ulnotrochlear joints would increase with progressive radial head resection, mimicking a displaced radial head fracture, in a cadaveric model. METHODS: Ten cadaveric specimens were tested. Intra-articular pressure sensors were used to measure pressure within the radiocapitellar and ulnotrochlear joints with the forearm in full supination. The elbow was loaded to 100 N in extension, 45° of flexion, and 90° of flexion under the following conditions: (1) intact radial head, (2) 20% radial head resection, (3) 40% radial head resection, and (4) 100% radial head resection. RESULTS: The distribution of pressure between the radiocapitellar and ulnotrochlear joints did not change with sequential, partial resection of the radial head (radiocapitellar joint, between 48.92% and 53.79%; ulnotrochlear joint, between 46.21% and 51.08%). After 20% resection, radiocapitellar peak contact pressure (PCP) increased by 22% (from 1,410 to 1,721.5 kPa) and ulnotrochlear PCP increased by 36% (from 1,319 to 1,797.5 kPa). After 40% resection, radiocapitellar PCP increased by 123% (from 1,410 to 3,145 kPa; p = 0.0003) and ulnotrochlear PCP increased by 105% (from 1,319 to 2,702 kPa; p = 0.007). Ulnotrochlear PCP increased by a total of 159% after complete radial head resection (from 1,319 to 3,415.5 kPa; p = 0.003). CONCLUSIONS: Pressures in the radiocapitellar and ulnotrochlear joints were equally distributed with an intact radial head and after partial resection. Radiocapitellar and ulnotrochlear pressures increased with increasing radial head resection, significantly exceeding 100% of normal after radial head resection of 40% of the anterolateral diameter. LEVEL OF EVIDENCE: Prognostic Level III . See Instructions for Authors for a complete description of levels of evidence.

Formal Orthopaedic Surgery "Boot Camp" Curriculum to Optimize Performance on Acting Internships.

Orthopaedic surgery is one of the most competitive residency specialties in the National Residency Matching Program. To improve the odds of matching, senior medical students applying in the field participate in orthopaedic surgery away rotations with programs across the country. Students who do well on these rotations have a higher likelihood of matching because clinical performance is a principal criterion used by admissions committees to rank applicants. On the other hand, these rotations can be physically and emotionally taxing on medical students because poor performance can negatively affect their application and, thus, chances of matching at that institution. Unfortunately, the resources provided by medical schools to prepare students for these high-stakes rotations are usually sparse and unstructured. To address this gap in training at our institution, we developed a formal "boot camp" offered through the university to prepare interested senior medical students for their orthopaedic surgery acting internships. This course focuses on building a solid foundation of musculoskeletal knowledge and exposing students to surgical and procedural skills that are fundamental to the practice of orthopaedic surgery. Over the 2 years, this course has been offered at our institution, and it has proven successful in outcome measures, such as student satisfaction and preparedness, student orthopaedic knowledge, program director evaluations, and match rate. This article describes the novel 1-month curriculum, which includes lectures, laboratory, and clinical experience.

Psychological outcomes affect functional outcomes in patients with severe pelvic ring fractures.

PURPOSE: To evaluate the correlation between post-traumatic functional and psychological outcomes in patients with severe pelvic ring injuries. METHODS: Forty-four patients who sustained a completely unstable pelvic ring injury (Tile C, AO/OTA 61C) treated in our institution from 2012 to 2017 were included. A telephone interview was performed in 16 of 44 patients to evaluate pelvic functionality, using the Majeed pelvic score, and psychological evaluation, using Hamilton anxiety and depression rating scales. RESULTS: The mean Injury Severity Score (ISS) was 27 ± 12, and mean GCS at presentation was 13 ± 4. Average time from trauma to interview was 3 years (range, 1-5 years). Mean Majeed pelvic score was 67 ± 22. Majeed sub-scores were pain 19 ± 9, work 10 ± 7, sitting 8 ± 2, sexual intercourse 3 ± 2, walking aids 11 ± 2, gait unaided 9 ± 2, walking distance 8 ± 3. Mean depression and anxiety scores were 16 ± 12 and 17 ± 14, respectively. Significant correlations were observed between functional and psychological outcomes (P < 0.005). Majeed score was negatively correlated with depressive symptoms (r = -0.721, P = 0.002) and anxiety symptoms (r = -0.756, P = 0.001). Depression and anxiety scores were positively correlated (r = 0.945, P < 0.001). CONCLUSION: Lower functional outcomes in patients with Tile C pelvic injuries were correlated with more severe symptoms of depression and anxiety. We recommend that providers consider and treat patients' mental health condition during posttraumatic recovery.