(a–i). Patella Dislocation. (a) Patella sunrise view, suggestive of MPFL and MPTL avulsion, a large osteochondral defect of the patella, and a displaced fragment in the lateral gutter. (b,c) MRI of the left knee, joint effusion, osteochondral fracture of the patella, displaced fragment in the lateral gutter, bone bruise of the lateral femoral condyle. (d–h) Intraoperative situation, osteochondral defect of the medial facet of the patella, before and after fragment fixation, small full-thickness osteochondral lesion of the lateral femoral condyle repaired with one chondral dart, partial-thickness chondral injury of the medial femoral condyle. (i) Postoperative patella sunrise view. (j,k). Arthroscopic re-evaluation three months postoperative: (j) the osteochondral lesion is healed and stable under probing, (k) the small remaining defect is filled with fibrocartilaginous tissue.