Knot impingement after arthroscopic rotator cuff repair mimicking infection: A case report

Figure 1 Plain radiographs of the right shoulder show erosive change of the acromion undersurface. A: Anteroposterior view; B: 30^o caudal tilting view.

Figure 2 Magnetic resonance imaging. A-C: Coronal T2-weighted (A) and enhanced (B and C) magnetic resonance images show a moderate amount of bursal fluid and synovial thickening with enhancement; D-F: Coronal T1-weighted (D) and enhanced (E and F) images show irregular erosive change of the acromion undersurface (white arrows).

Figure 3 Arthroscopic findings. A: Loose suture threads; B and C: Suture knots (B) with severe subacromial bursitis, and irregular acromial erosion caused by suture knots (C) (arrows).