Delayed Onset Iliopsoas Tendonitis With Intramuscular Hematoma Following Total Hip Arthroplasty.

Iliopsoas tendonitis following total hip arthroplasty (THA) can be challenging to diagnose due to the many causes of postoperative groin pain. This case involves a 66-year-old female with right-sided hip and groin pain and a palpable mass, 3 years post-THA. Initial recovery was unremarkable until the sudden onset of symptoms after exercise. The patient presented with a palpable mass on the groin area and pain and underwent several consults with general surgery and orthopaedics. A series of unremarkable radiogram, biopsies, and negative infectious workup prompted revision surgery, which included acetabular component revision and iliopsoas tenotomy. The patient experienced significant pain relief and improved mobility postrevision. This case highlights a complication of THA and the complexity of diagnosing and treating iliopsoas tendonitis post-THA.