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Background: The objective of this study was to determine whether talar neck fractures with proximal extension (TNPE) into the talar body are associated with higher rates of avascular necrosis (AVN) compared to isolated talar neck (TN) fractures. Methods: A retrospective review of patients sustaining talar neck fractures at a level I trauma center from 2008 to 2016 was performed. Demographic and clinical data were collected from the electronic medical record. Fractures were characterized as TN or TNPE based on initial radiographs. TNPE was defined as a fracture that originates on the talar neck and extends proximal to a line subtended from the junction of the neck and the articular cartilage dorsal to the anterior portion of the lateral process of the talus. Fractures were classified according to the modified Hawkins classification for analysis. The primary outcome was the development of AVN. Secondary outcomes included nonunion and collapse. These were measured on postoperative radiographs. Results: There were 137 fractures in 130 patients, with 80 (58%) fractures in the TN group and 57 (42%) in the TNPE group. Median follow-up was 10 months (interquartile range, 6-18 months). The TNPE group was more likely to develop AVN as compared to the TN group (49% vs 19%, P Conclusion: We found a higher rate of AVN, subsequent collapse, and nonunion in patients with TNPE compared to isolated TN fractures. Level of Evidence: Level III, retrospective cohort study.

Background Bilateral asymmetric hip dislocation, with one hip dislocated posteriorly and with anterior dislocation of the contralateral hip, is a rare injury pattern. A total of 34 cases have been reported in English literature, but only 24 cases detail injury mechanism and patient demographic factors, 3 of which reported bilateral asymmetric hip dislocation in female patients. Only one report describes more than one example. We describe four patients with bilateral asymmetric hip dislocation, including one example in a female patient, which represents the largest case series to date. Pertinent anatomy, injury mechanism, treatment options, and prognosis are also discussed. Methods A literature review was conducted via PubMed using the term bilateral asymmetric dislocation. Review of additional reports cited by articles found by our search resulted in what we think to be an exhaustive list of cases reported to date.A medical record review of four patients treated at our institution, a Level I trauma center, was performed to compare our treatment methods and outcomes to those previously described. Results All four patients in our case series had satisfactory outcomes. Motor vehicle collision is the most common cause of bilateral asymmetric hip dislocation. Conclusion Timely, accurate reduction of bilateral asymmetric hip dislocation is recommended for optimal outcomes. An understanding of pertinent anatomy about the hip joint allows the orthopedic surgeon to perform a safe, timely reduction. In the absence of an associated acetabular fracture, conservative management with weight-bearing restrictions typically leads to good outcomes without complications such as aseptic necrosis of the femoral head. Level of evidence Therapeutic study, level V.