Arthroscopic iliopsoas release decreases iliopsoas volume, hip flexion strength

Results from this study indicated patients had iliopsoas atrophy with a 25% decrease in volume and a decrease of 19% in seated hip flexion strength following hip arthroscopy with iliopsoas release.

Researchers evaluated 18 patients who underwent hip arthroscopy with iliopsoas release for internal snapping hip and a control group of 18 patients who underwent arthroscopy without iliopsoas release for femoroacetabular impingement and/or chondrolabral damage. The mean follow-up was 21 months. Investigators calculated iliopsoas volume with segmented MRIs. A custom testing apparatus was used to evaluate isometric hip flexion strength in both the supine position and the seated position. Unpaired and paired t tests were used to determine the differences between treatment groups and the operative and nonoperative limbs in the groups, respectively.

Investigators found patients who underwent hip arthroscopy with iliopsoas had significantly smaller iliopsoas muscle in the surgical limb and the seated position was weaker compared with the nonsurgical limb. The release group vs. patients in the control group had a higher percentage decrease in iliopsoas seen in the MRI evaluations (–25% vs. –0.6%) and greater decrease in seated hip flexion strength amongst the operative and nonoperative limbs (–19% vs. –3.9%).

According to the researchers, differences were not significant between both the limbs and treatment groups regarding the supine strength. ‒ by Monica Jaramillo

Disclosures: Brandenburg reports receiving financial support for research from the LS Peery Foundation Discovery Program in Musculoskeletal Restoration and is participating in the Medical Student Research program at the University of Utah School of Medicine. Please see the full study for a list of all other researchers’ relevant financial disclosures.

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Source:

Brandenburg JB, et al. Am J Sports Med. 2016;doi:10.1177/0363546515626173.