Background: Rupture of the anterior cruciate ligament (ACL) is a common sports injury and is known to be associated with an increased risk of knee osteoarthritis. Several studies have indicated that the risk of additional injuries to the menisci and articular cartilage increases with delays in the treatment of ACL tears. However, no consensus has been reached regarding the ideal timing for ACL reconstruction in terms of preventing secondary lesions. Purpose: To determine how the time elapsed between an ACL lesion and its reconstruction affects the incidence of meniscal and chondral lesions. Study Design: Case series; Level of evidence, 4. Methods: Medical records of 764 patients who underwent primary ACL reconstruction were reviewed. Data from arthroscopic findings that included information about meniscal lesions and full-thickness articular cartilage lesions at the time of surgery were collected. The association between time elapsed between ACL lesion and reconstruction surgery and incidence of articular cartilage and meniscal lesions was analyzed by chi-square or Fisher exact test. The risk of secondary lesion was calculated by odds ratios (ORs) obtained from simple logistic regression analysis. Results: A positive correlation was observed between time after injury and the presence of any articular lesions ( P = .003), cartilage lesions ( P = .01), and medial meniscus lesions ( P < .001). When analyzing the risk of secondary lesion relative to the reference period ( 24 months (OR = 5.88). Furthermore, the odds of lesions on the medial meniscus increased when the timing between injury and surgery was 6 to 12 months (OR = 2.71) and continued to increase when the timing was 12 to 24 months (OR = 3.78) and >24 months (OR = 9.07). Conclusion: Associated articular lesions are more common if ACL reconstruction is delayed by ≥6 months (medial meniscus lesion) and ≥1 year (chondral or any meniscal lesion).
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