Imaging changes following surgery for ischiofemoral impingement

Area of Science:

• Orthopedic Surgery
• Radiology
• Sports Medicine

Background:

• Ischiofemoral impingement (IFI) is a condition characterized by hip pain, often treated with partial resection of the lesser trochanter (LT plasty).
• Limited research exists on the post-operative imaging findings following LT plasty for IFI.

Purpose of the Study:

• To evaluate magnetic resonance imaging (MRI) changes in the lesser trochanter and surrounding hip musculature after LT plasty for IFI.

Main Methods:

• Twenty-one patients undergoing LT plasty for IFI were included.
• MRI scans were performed pre- and post-operatively (average 11 months post-op).
• Lesser trochanter length and iliopsoas muscle cross-sectional area were measured and compared.

Main Results:

• The average amount of lesser trochanter resected was 7.3 mm.
• Iliopsoas muscle cross-sectional area decreased by an average of 35% in 95% of patients post-surgery.
• The reduction in iliopsoas size did not correlate with modified Harris Hip Score improvements at midterm follow-up.

Conclusions:

• Endoscopic LT plasty results in an average 35% decrease in iliopsoas muscle size.
• This muscle size reduction is not associated with midterm functional outcomes in patients with ischiofemoral impingement.