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  • Title: The unstable slipped capital femoral epiphysis: does the rate of osteonecrosis really depend on the timing of surgery and surgical technique?
    Author: Xiang Ng W, Yuan Kau C, Chien Lin Ho V, Wei Peng Ng J, Jia Ying Lee B, Kim Luan Lee N, Boon Leong Lim K.
    Journal: J Pediatr Orthop B; 2019 Sep; 28(5):458-464. PubMed ID: 30768578.
    Abstract:
    The aim of this study was to investigate whether the timing of surgery and surgical technique affect the rate of osteonecrosis in unstable slipped capital femoral epiphysis (SCFE). This is a retrospective review of all unstable slips that were treated at our institution over 8.5 years with a minimum follow-up period of 12 months. Patients with stable slips were excluded from this analysis. Demographic data, time to surgery, and surgical technique were analyzed. Twenty-three unstable slips were included for study after excluding 40 stable slips. There were 17 males and six females, with an average age of 11.9 years; 13 patients had right SCFEs. The average time from diagnosis to surgery was 57.7 h. Nine (39.1%) surgeries were performed within 24 h of admission, whereas 14 (60.9%) surgeries were performed after 24 h. Minimum follow-up was 23 months. Two patients developed osteonecrosis: one underwent surgery within 24 h of admission and the other after 24 h. Both underwent in-situ screw fixation. In the group that did not develop osteonecrosis, 76.2% underwent in-situ screw fixation and 23.8% underwent manipulative reduction. The rate of developing osteonecrosis following screw fixation in unstable SCFE was unrelated to whether surgery was performed before or after 24 h of admission (P = 1.0), or whether in-situ screw fixation or manipulative reduction pre-fixation was performed (P = 0.605). The results of this small series challenge the practice of stabilizing unstable SCFEs emergently and the belief that gentle manipulative reduction pre-fixation is not recommended because it may increase the rate of osteonecrosis. Level of Evidence: Level IV Evidence.
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