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In this series, there was a 32% reoperation rate for MAT, with simple arthroscopic debridement being the most common surgical treatment (59%), and a 95% allograft survival rate at a mean of 5 years. Those requiring additional surgery still benefited, having an 88% allograft survival rate, but were at an increased risk of failure. Patients requiring secondary surgery within 2 years had an odds ratio of 8.4 for future arthroplasty or MAT revision.

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Background:Treatment decision making for chondral defects in the knee is multifactorial. Articular cartilage pathology, malalignment, and meniscal deficiency must all be addressed to optimize surgical outcomes.Purpose:To determine whether significant clinical improvements in validated clinical outcome scores are observed at minimum 2-year follow-up after articular cartilage repair of focal articular cartilage defects of the lateral compartment of the knee with or without concurrent distal femoral osteotomy and lateral meniscus transplant.Study Design:Case series; Level of evidence, 4.Methods:Symptomatic adults who underwent surgical treatment (microfracture, autologous chondrocyte implantation [ACI], osteochondral autograft or allograft) of full-thickness lateral compartment chondral defects of the knee with or without a postmeniscectomy compartment or valgus malalignment by a single surgeon with minimum 2-year follow-up were analyzed. Validated patient-reported and surgeon-measured outcomes were collected pre- and postsurgery. Pre- and postoperative outcomes were compared via Student t tests.Results:Thirty-five subjects (mean age, 29.6 ± 10.5 years) were analyzed. Patients had been symptomatic for 2.51 ± 3.52 years prior to surgery and had undergone 2.11 ± 1.18 surgeries prior to study enrollment, with a mean duration of follow-up of 3.65 ± 1.71 years. The mean defect size was 4.42 ± 2.06 cm2. Surgeries included ACI (n = 18), osteochondral allograft (n = 14), osteochondral autograft (n = 2), and microfracture (n = 1). There were 18 subjects who underwent concomitant surgery (14 lateral meniscus transplant, 3 distal femoral osteotomy, and 1 combined). Statistically significant (P < .05) and clinically meaningful improvements were observed at final follow-up in Lysholm, subjective International Knee Documentation Committee (IKDS), Knee Injury and Osteoarthritis Outcome Score (KOOS) subscales, Short Form–12 (SF-12) scores, and patient satisfaction. At follow-up, patients undergoing isolated articular cartilage surgery had a significantly higher KOOS quality of life subscore than did those undergoing articular cartilage surgery and lateral meniscus transplant (P = .039). Otherwise, there were no significant postoperative differences between the isolated and combined surgery groups in any outcome score. Five patients underwent 6 reoperations (1 revision osteochondral allograft, 5 chondroplasties). No patient was converted to knee arthroplasty.Conclusion:In patients with lateral compartment focal chondral defects with or without lateral meniscal deficiency and valgus malalignment, surgical cartilage repair and correction of concomitant pathology can significantly improve clinical outcomes at 2-year follow-up with no significant differences between isolated and combined surgery and a low rate of complications and reoperations.

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