Poster 219: Changes in Body Composition and Bone Mineral Density Following Arthroscopic Treatment of Femoral Acetabular Impingement in Collegiate Athletes: A Matched Cohort Study

Objectives: This study’s objective was to compare changes in body composition measurements (BCM) and bone mineral density (BMD) over 2 years between collegiate athletes following hip arthroscopy treat labral tears due femoral acetabular impingement syndrome (FAI) matched uninjured athletes. Methods: A retrospective cohort study compared BCM BMD of NCAA Division I who underwent as a treatment for symptomatic FAI (scope group) with control group did not have 24 months. The the scope by sex sport at ratio 2:1. Inclusion criteria included arthroscopic surgery January 1, 2017, May 2019, repair, head-neck reshaping osteoplasty address an alpha angle > 55 degrees, available preoperative postoperative outcomes. Athletes had open surgery, athletic pubalgia, other lower extremity during period, or failure complete testing were excluded. Incoming beginning August 2017 outcomes controls. Dual Energy X-ray Absorptiometry scanning used measure BMD, lean mass, fat mass. regions interest trunk (comprised pelvis, spine, ribs), bilateral extremities (Figure 1A). mixed-effects linear regression model differences change groups baseline 1- 2-years. interaction time treated fixed effect, individual athlete random effect. p- value < 0.05 set threshold statistical significance all tests two-tailed. Results: total 20 period. Three excluded insufficient pre- data, one concomitant pubalgia. Therefore, 16 1B) 32 controls (Table 1). Relative group, group’s significantly reduced 1-year (β: - 0.052 grams/cm [95% CI: -0.073 -0.032]; p 0.001; Figure 1C). At 2-years, remained control, but this difference no longer statistically significant -0.020 grams/cm2; [ -0.051 0.011]; = 0.20). No legs identified -0.014 [-0.075 0.047]; 0.66) 2-years 0.057 [-0.038 0.155]; 0.24). demonstrated decreases comprising 1D), including pelvis -0.071 [-0.103 -0.040]; 0.001), spine -0.057 [- 0.092 -0.023]; 0.002), ribs (-0.027 [-0.053 -0.002]; 0.035). Similarly, mass 1E) decreased 1,903 grams relative (95% -3052 -746; 0.003) 1-year, 1,953 -3009 -892; 0.001). Lean estimates increase (1196 303 2090]; 0.011). Changes differ -394 -2417 1646]; 0.70) -1534 -3513 447]; 0.13). from 582 -611 1780]; 0.34) -201 -1606 1217]; 0.78). Conclusions: Compared athletes, after FAI. reductions noted greatest reduction occurring pelvis. also 1 years. These same are seen however, suggesting rehabilitation restrictions alone unlikely account entirely these findings. Taken together, combination persistent suggests alteration axial portion arthroscopy. data may indicate need prioritizing early loading through weight-bearing exercises, incorporating core strengthening postoperatively improve Ultimately, both health important considerations arthroscopy, when selecting patients preoperatively managing them postoperatively. [Table: see text]