BACKGROUND: Fresh osteochondral allograft (OCA) transplantation is an established treatment option for patients with chondral or osteochondral lesions of the knee. Predictably positive outcomes are seen in situations of focal or isolated cartilage defects. However, OCA transplantation may also be performed in more complex joint salvage situations in young patients. PURPOSE: To evaluate survivorship and outcomes in patients who underwent OCA transplantation for large bipolar lesions of the knee. STUDY DESIGN: Case series
Level of evidence, 4. METHODS: Fresh OCAs were implanted for bipolar chondral lesions in 86 patients (89 knees) between 1983 and 2020. A total of 37 male and 52 female knees with a mean patient age of 37.9 years (range, 14.5-66.0 years) were treated. Surgical indications included degenerative chondral lesions, osteoarthritis, osteochondritis dissecans, traumatic chondral injuries, and previous failed OCAs. The clinical evaluation included the modified Merle d'Aubigné-Postel score, International Knee Documentation Committee (IKDC) score, and Knee Injury and Osteoarthritis Outcome Score (KOOS). Outcomes were collected during outpatient clinic visits or via mail. The minimum follow-up was 2 years. Additional procedures after OCA transplantation were documented. OCA failure was defined as a reoperation that involved removal of the allograft. RESULTS: There were 81 knees (91.0%) that had undergone previous surgery, with a mean of 3.2 previous procedures (range, 1-11). The mean treated defect surface area was 16.7 cm CONCLUSION: OCA transplantation is a salvage treatment option for large bipolar cartilage lesions of the knee with acceptable survivorship and significant clinical improvement in a challenging patient population.