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Purpose Methods Results Conclusion Level of Evidence To evaluate the efficacy of surgical treatment of the discoid lateral meniscus with osteochondritis dissecans (OCD) through clinical and radiological evaluations, focusing on recurrent or postoperative OCD occurrence.This retrospective study included patients with symptomatic discoid lateral meniscus with OCD (pre‐OCD group) and without OCD (non‐OCD group) who had undergone arthroscopic surgery with >5 years of follow‐up. Age, sex, Lysholm score, Tegner activity scale, surgical procedure, and recurrent or postoperative OCD lesions were compared. The association between patient variables and postoperative OCD was determined using multivariate logistic regression analysis.Of the 95 knees, 15 (15%) were in the pre‐OCD group. Healing was observed in 14/15 (93%) knees. Recurrent and postoperative OCDs were reported in 4/15 (28.5%) knees in the pre‐OCD and 7/80 (8.8%) knees in the non‐OCD groups at a mean of 3.2 ± 1.1 and 3.7 ± 1.2 years, respectively. Pre‐ and postoperative Tegner activity scale and Lysholm scores were higher in the pre‐OCD group but similar to those in the non‐OCD group. The incidence of recurrent OCD in the pre‐OCD group was significantly higher than that of postoperative OCD in the non‐OCD group. Younger patients (odds ratio, 0.49; p = 0.003) had an increased risk of experiencing recurrent or postoperative OCD in multivariate analysis. The optimal cutoff age for distinguishing recurrent or postoperative OCD was 9 years.Surgical procedures for OCD lesions in the pre‐OCD group were successful. Multivariate analysis identified age as a risk factor for recurrent or postoperative OCD; therefore, conservative treatment is recommended for patients with discoid lateral meniscus before preadolescence to prevent postoperative OCD occurrence.Level III. [ABSTRACT FROM AUTHOR]

Purpose: Associated risk factors for the development of cyclops lesions have been little. Investigated, because most previous studies have limited their research to cases with symptomatic cyclops lesions (cyclops syndrome). The purpose of this study was to evaluate the presence of cyclops lesions using magnetic resonance image (MRI) at 6 and 12 months after anterior cruciate ligament reconstruction (ACL-R), and to investigate the associated risk factors of cyclops lesions and syndrome. Methods: A retrospective analysis of patients who underwent ACL-R using bone–patellar tendon–bone (BTPB) or hamstring tendon autograft from 2008 to 2017 was conducted. Predictor variables (age, sex, body mass index [BMI], time from injury to ACL-R, preinjury Tegner activity score, graft, meniscal and cartilage injury, and notch width index on MRI for the presence of cyclops lesions and syndrome were analyzed with multivariate logistic regression. Results: Four hundred and fifty-five patients (225 males and 230 females) were enrolled. One hundred and four patients (22.9%) had cyclops lesions, and all cyclops lesions were detected on MRI at 6 months post-operatively. In addition, 20 patients (4.4%) had cyclops syndrome which means that these were symptomatic cases. The risk factors for presence of cyclops lesions were BPTB autograft (OR = 2.85; 95% CI 1.75–4.63; P < 0.001) and female sex (OR = 2.03; 95% CI 1.27–3.25; P = 0.003). The presence of cyclops syndrome increased with graft (BPTB) (OR = 18.0; 95% CI 3.67–88.3; Powered by Editorial Manager® and ProduXion Manager® from Aries Systems Corporation P < 0.001), female sex (OR = 3.27; 95% CI 1.07–10.0; P = 0.038), and increased BMI (OR = 1.21; 95% CI 1.05–1.39; P = 0.008). Conclusions: All cyclops lesions were detected 6 months after ACL-R, and the majority of them were asymptomatic. BPTB autograft and female sex were the significant risk factors for the presence of cyclops lesions and syndrome. In addition, increased BMI was associated with a higher risk of developing cyclops syndrome. When BPTB autograft is used for a female patient, full active knee extension should be encouraged in the early period after ACL-R to prevent cyclops lesion formation. Level of evidence: Level IV, retrospective case series. [ABSTRACT FROM AUTHOR]