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EP6.24 Substantial Loss of Skeletal Muscle Mass Occurs Early After Hip Preservation Surgery
Abstract   Peer reviewed

EP6.24 Substantial Loss of Skeletal Muscle Mass Occurs Early After Hip Preservation Surgery

Irving Delgado-Arellanes, Robert Westermann, John Davison, Natalie Glass, Courtney Seffker, Gretchen Jones, Steele McCulley, Jenna Jensen, Ashley Kochuyt and Michael Willey
Journal of hip preservation surgery, Vol.12(Suppl 1), pp.i97-i97
03/27/2025
DOI: 10.1093/jhps/hnaf011.313
PMCID: PMC11954058

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Abstract

Introduction : Hip preservation surgery and postoperative restrictions can cause loss of skeletal muscle that is not easily recovered. The amount of skeletal muscle lost after hip preservation surgery has not been quantified. This study aims to document pre- to post-operative changes in body composition for patients undergoing hip arthroscopy (HA), periacetabular osteotomy (PAO), and femoral osteotomy (FO). Methods : We prospectively enrolled patients indicated for hip preservation surgery. Body composition was measured pre-operatively and at 3 weeks, 6 weeks, 12 weeks, and 24 weeks post-operatively using bioelectrical impedance analysis (skeletal muscle mass (SMM), fat mass (FM), lean body mass (LBM)). Additionally, patients completed baseline international Hip Outcome Tool (iHOT) score. Changes in body composition were evaluated using generalized linear mixed models. Correlations between iHOT scores and body composition were described using Pearson correlation coefficients. Results : 79 participants (23.9±8.3 years) were enrolled and completed at least one follow up measurement. Participants were predominantly female (85%), white (96%), and 52% underwent PAO/FO. Sensitivity analyses determined no difference in arthroscopy vs osteotomy procedures in baseline characteristics or changes in body composition over time. Participants lost a mean of -0.59 (-0.94 - -0.25)kg of SMM by 6-weeks (27.5 (26.1-28.9)kg to 26.9 (25.9-28.6)kg, p=0.003) with significant recovery by 12-weeks (p=0.142). Lower pre-operative iHOT score was associated with higher pre-operative FM (r= -0.25, p=0.019) and lower SMM (r=0.25, p=0.028). Discussion : We found an early significant loss of SMM in the first 6 weeks after hip preservation surgery that was similar between arthroscopic and osteotomy surgeries. This early loss of skeletal muscle recovered by 12 weeks after surgery. Lower pre-operative iHOT score was associated with a low SMM and high FM. Future studies should assess the impact of nutrition supplementation and early rehabilitation on early loss of SMM after hip preservation surgery.
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