2025 ISAKOS Biennial Congress ePoster
Repair Of Isolated Traumatic Lateral Meniscal Injury Yields Comparable Clinical Outcomes In Young And Middle-Aged Patients
Kodai Hamaoka, MD, Sapporo, Hokkaido JAPAN
Shinichiro Okimura, MD, PhD, Sapporo, Hokkaido JAPAN
Kazushi Horita, MD, Sapporo, Japan JAPAN
Yasutoshi Ikeda, MD,PhD, Sapporo JAPAN
Yohei Okada, MD,PhD, Sapporo City JAPAN
Tomoaki Kamiya, MD, Sapporo, Hokkaido JAPAN
Atsushi Teramoto, MD, PhD, Sapporo, Hokkaido JAPAN
Department of Orthopaedic Surgery, Sapporo Medical University School of Medicine, Sapporo, Hokkaido, JAPAN
FDA Status Cleared
Summary
The absence of significant differences in the PASS achievement rates for the KOOS subscale scores for symptoms, pain, and QOL between young and middle-aged patients after arthroscopic repair of isolated traumatic lateral meniscal injuries.
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Abstract
Background
The clinical outcomes of arthroscopic repair for isolated traumatic lateral meniscal injuries in middle-aged patients remain unclear. We aimed to compare the clinical outcomes of lateral meniscus repair between young and middle-aged patients, hypothesizing that both groups could achieve satisfactory clinical outcomes following the repair of isolated traumatic lateral meniscal injuries.
Methods
This retrospective study included patients who underwent arthroscopic repair for isolated lateral meniscal injuries between 2013 and 2021. The inclusion criteria were as follows: (1) age =15 years; (2) Kellgren–Lawrence grade =2; (3) at least two years postoperative follow-up; and (4) traumatic meniscus tear. The exclusion criteria included (1) a history of surgery on the ipsilateral knee; (2) the presence of a discoid lateral meniscus; (3) a degenerative and horizontal meniscus lesion; (4) a time from injury to surgery >1 year; (5) concurrent medial meniscus repair; and (6) concurrent ligament reconstruction and cartilage repair surgery. Patients were divided into two groups: those aged <35 years (Group Y) and those aged >35 years (Group M). Radiographic data were assessed preoperatively, and clinical outcomes were assessed using the Knee Injury and Osteoarthritis Outcome Score (KOOS) and the Patient Acceptable Symptom State (PASS) achievement rates for KOOS at the final follow-up. The Mann–Whitney U test, Wilcoxon signed-rank test, and Fisher’s exact test were used, with
Significance
level of 0.05. Statistical power calculations were performed using G*Power version 3.1.9.6 (Düsseldorf, Germany), with the significance level set at 0.05, effect size of 0.8, and power of 0.8. The minimum sample size required for the study was 56.
Results
Groups Y and M included 40 and 32 patients, respectively. Reoperations were performed for three patients from Group Y and one patient from Group M. No significant differences were noted in the preoperative radiographic parameters between the two groups, except for the differences in the K–L grades. Significant differences in preoperative KOOS scores were observed between the two groups in terms of symptoms, ADLs, and sports. At the final follow-up, all KOOS subscales had significantly improved in both groups, with Group Y showing significantly better outcomes than Group M. There were no significant differences observed in the PASS achievement rates between the two groups in terms of symptoms, pain, or quality of life (QOL).
Conclusions
This study reveals the absence of significant differences in the PASS achievement rates for the KOOS subscale scores for symptoms, pain, and QOL between young and middle-aged patients after arthroscopic repair of isolated traumatic lateral meniscal injuries. Moreover, all the KOOS scores significantly improved postoperatively in both groups at the final follow-up, with the scores in Group Y being superior to those in Group M. Overall, our findings suggest that meniscal repair may be a viable treatment option for isolated traumatic lateral meniscal injuries in middle-aged patients.