Arthroscopic treatment of iliopsoas tendinitis after total hip arthroplasty with acetabular cup malposition: Two case reports

Figure 5 Arthroscopic findings and histological features in Case 1. A: The capsular opening (white arrow) was enlarged and surrounded with frayed fibrous tissues (black arrowhead) and dark yellow amorphous material (white arrowhead), which looked like granulation tissue (anterolateral viewing portal); B: Partial synovectomy with biopsy (anterolateral viewing portal); C: Iliopsoas tendon release and bursectomy were performed (anterolateral viewing portal); D: Histopathologic study showed chronic inflammation with synovial hyperplasia and hemosiderin pigmentation (arrow; magnification, 200 ×).