Lesion Size May Predict Return to Play in Young Elite Athletes Undergoing Microfracture for Osteochondral Lesions of the Talus.

ABSTRACT

PURPOSE: To evaluate the clinical and sports-related outcomes of arthroscopic microfracture (MFx) for osteochondral lesion of the talus (OLT) in elite athletes. METHODS: The athletes who underwent arthroscopic MFx for OLTs at our institution between January 2011 and September 2015 with minimum 2 years of follow-up were reviewed. The Foot and Ankle Outcome Score, American Orthopaedic Foot & Ankle Society, and visual analog scale pain score, time and rate of "return-to-competition" (RTC, return to an official match for at least 1 minute after treatment), and rate of "return-to-play" (RTP, participation in at least 2 entire seasons after treatment) were used to evaluate the outcomes. We compared athletes who were able to RTP with those who were not. RESULTS: In total, 41 patients (mean age 19.34 ± 3.76 years) were included. The mean follow-up was 54.9 ± 13.72 months. In total, 36 patients had medial lesions, and 5 patients had lateral lesions. All subscales of preoperative Foot and Ankle Outcome Score were significantly improved at the final follow-up. The mean preoperative American Orthopaedic Foot & Ankle Society score of 74.46 ± 8.10 improved to 91.62 ± 2.99 (P < .001) at the final follow-up. The mean preoperative visual analog scale pain score of 5.44 ± 1.57 improved to 2.66 ± 1.04 (P < .001). All patients achieved RTC (100%) at mean time of 5.45 ± 3.18 months, and 74.4% of patients were able to RTP. The RTP-group showed significantly smaller lesions compared to the No-RTP group (71.52 ± 43.29 vs 107.00 ± 45.28 mm2, P = .009). The cut-off OLT size for predicting RTP was 84.0 mm2, with a sensitivity of 90.0% and specificity of 75.9%. CONCLUSIONS: All athletes were able to RTC at average of 5.45 months after MFx for OLTs with minimal subchondral involvement, and 74.4% were able to RTP. The only prognostic variable for RTP was lesion size, and its predictive cut-off was 84.0 mm2. LEVEL OF EVIDENCE IV, Case series.