Arthroscopic anterior inferior iliac spine decompression does not alter postoperative muscle strength

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Arthroscopic anterior inferior iliac spine decompression does not alter postoperative muscle strength Satoshi Tateishi1 · Yasuo Onishi2 · Hitoshi Suzuki2 · Makoto Takahashi1 · Junichiro Shiraishi1 · Christopher M. Larson1,3 · Soshi Uchida2  Received: 8 October 2017 / Accepted: 21 June 2018 © The Author(s) 2018

Abstract Purpose  The purpose of this study was to assess the additional effect of anterior inferior iliac spine (AIIS) decompression on knee extensor and hip flexor strength and compare functional outcomes after arthroscopic FAI correction with and without AIIS decompression. Methods  Sixty patients who underwent arthroscopic FAI correction surgery were divided into two groups matched for AIIS morphology: 31 patients who underwent arthroscopic FAI surgery only (without AIIS decompression) (FAI group) (AIIS Type I; n = 5, Type II; n = 26, Type III; n = 0) and 29 patients who underwent arthroscopic FAI surgery with AIIS decompression (AIIS group) (AIIS Type I; n = 5, Type II; n = 24, Type III; n = 0). Knee extensor and hip flexor strength were evaluated preoperatively and at 6 months after surgery. Patient-reported outcome (PRO) scores using the modified Harris hip score (MHHS), the nonarthritic hip score (NAHS) and iHOT-12 were obtained preoperatively and at 6 months after surgery. Results  In the AIIS group, there was no significant difference between knee extensor strength pre- and postoperatively (n.s.). In the AIIS group, hip flexor strength was significantly improved postoperatively compared to preoperative measures (p