[Acute osteochondral lesions after patella dislocation]

Acute osteochondral lesions of the knee are injuries often caused by patella dislocations. In cases of negative standard x-rays magnetic resonance imaging (MRI) scans should be used to exclude these injuries, as even large fragments can escape visualization with x-rays. These lesions are strong indications for surgical intervention especially if refixation is considered. The intra-articular defect is visualized using arthroscopy and the dislocated fragment is retrieved entirely. Inspection of the fragment is performed ex situ to determine whether or not refixation should be performed. The refixation technique to be used for lesions in the femoro-patellar joint depends on fragment size and defect site. Current biodegradable implants have demonstrated good clinical results without the need for implant removal. The rehabilitation protocol should be individualized to the patient, size and site of the defect.