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Background: Treatment of patients with Crowe type III and IV dislocated hips is challenging because of the hip deformity in these patients. In addition to the usual total hip replacement, shortening and reduction of the femur are often required. We herein report on our surgical technique using a monoblock cylindrical cementless stem and a direct lateral approach. Methods: This study included patients with a diagnosis of severe developmental dysplasia of the hip (Crowe types III and IV) who underwent primary total hip arthroplasty at our hospital from August 2019 to January 2022. Eleven hips of seven patients were treated. All patients underwent horizontal osteotomy using a monoblock cylindrical cementless stem and a direct lateral approach. Complications such as dislocation, infection, and implant dropout were evaluated. In addition, the clinical assessment included the hip range of motion at the last observation and hip function based on the Japanese Orthopaedic Association (JOA) hip score and the Japanese Orthopaedic Association Hip Disease Evaluation Questionnaire (JHEQ). Results: The average operation time was 224 min (range, 194–296 min), and the average bleeding amount was 396.1 g (range, 20–1010 g). The main complications were acetabular implant dislocation, postoperative dislocation, intraoperative arterial injury, intraoperative proximal femoral fracture, subsidence of femoral implant. and postoperative pulmonary infarction, which occurred in one patient each. Conclusion: Total hip arthroplasty for Crowe type III and IV hips is associated with various surgical technical difficulties because of its anatomical characteristics. While patients with severe osteoporosis are contraindicated, the use of a cylindrical monoblock cementless stem and the direct lateral approach makes it possible to simplify the procedure for shortening the femur and increase the indications for surgery. Level of evidence: Therapeutic Level Ⅳ.

Background: Although surgeons must perform implantation of the cementless stem during total hip arthroplasty (THA) without complications, assessment is left to the surgeon’s intuitive judgement, which could contain inter/intra-observer bias variety. We therefore asked (1) whether the sound created during the stem implantation could be evaluated objectively and (2) whether those sounds are correlate to the complication specific to the cementless stems. Our hypothesis is that the sounds produced during stem insertion could be quantified and related to the complications. Patients and method: In 71 THAs, we quantified the sound produced during stem insertion and investigated the relationship between these sounds and the occurrence of intraoperative fracture and subsidence. Results: The sound data were divided into two patterns: Patterns A and B. The difference between the peak value (dB) at the most common frequency (near 7 kHz) and the second most common frequency (near 4 kHz) of strikes during the final phase of implantation in Patterns A and B showed a significant difference. Adverse events on intraoperative fracture and subsidence were significantly less common in patients with Pattern A than in those with Pattern B (six of 42 hips with Pattern A and 13 of 29 hips with Pattern B, p = 0.004). Pattern A in predicting a clinical course without those adverse events was 69.2% and the specificity was 68.4%. Positive and negative predictive values were 85.7% and 44.8%, respectively. Conclusion: The sound generated during stem insertion was quantified. Those sound patterns were associated with complications.

A 35-year-old man injured his right foot by slipping down 200 m into a crater on top of Mount Fuji, where some snow still remained. The next day the patient climbed up from the crater with his friend's assistance and began to descend the mountain; he met the Shizuoka police mountain distress rescue team at the 9th station. The Shizuoka police mountain distress rescue team transported the patient on foot to the snowless 7th station. The Shizuoka police aviation unit, flying a helicopter, then collected the patient. They transported the patient to the nearby Fujinomiya fire department station. The eastern Shizuoka physician-staffed helicopter emergency medical service landed there, and the patient was transported to Juntendo Shizuoka Hospital. On arrival, he had stable vital signs, but his right foot showed a dislocated fracture with frostbite. This is the first case report of collaboration between a helicopter emergency medical service and a police helicopter to rescue a victim from Mount Fuji. When managing victims in high-altitude settings, such as Mount Fuji, collaboration between multiple organizations is necessary. [ABSTRACT FROM AUTHOR]