Department of Orthopaedic Surgery, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, 2-5-1 Shikatacho, Kitaku, Okayama 700-8558, Japan.
Department of Orthopaedic Surgery, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, 2-5-1 Shikatacho, Kitaku, Okayama 700-8558, Japan.
Orthop Traumatol Surg Res. 2017 Dec;103(8):1179-1182. doi: 10.1016/j.otsr.2017.07.022. Epub 2017 Sep 22.
Medial meniscus posterior root tear (MMPRT) leads to abnormal biomechanics of the knee by inducing the medial meniscus extrusion (MME). However, a time-dependent increase of the MME is not fully elucidated in patients suffering from the acute MMPRT. The aim of this study was to investigate the relationships among disease duration of the MMPRT and severity of the MME. We hypothesized that MME measurement correlates with disease duration after a sudden onset of the minor traumatic MMPRT during the short-term follow-up period.
Forty-six patients who had an accurate episode of the posteromedial painful popping were investigated. All the patients were diagnosed having a symptomatic MMPRT with magnetic resonance imaging (MRI) examinations. Absolute MME was measured using MRI scans within 12 months after painful popping events. A correlation coefficient between duration from injury to MRI examination and absolute MME was evaluated.
Mean absolute MME was 4.5±1.6mm (range, 1.1-8.8mm) on MRI measurements. A good correlation was observed between MME measurement and duration from injury to MRI examination (R=0.612). The best-fit equation for predicting each value was: MME=0.014×disease duration+3.288mm.
This study demonstrated that absolute MME increases progressively within the short duration after the onset of symptomatic MMPRT. Our results suggest that preoperative MME assessment may be important in determining disease duration and treatment strategy of the MMPRT.
Retrospective cohort study level IV.
内侧半月板后根部撕裂（MMPRT）通过导致内侧半月板挤出（MME），导致膝关节生物力学异常。然而，在患有急性 MMPRT 的患者中，MME 的时间依赖性增加尚未完全阐明。本研究旨在探讨 MMPRT 发病后时间与 MME 严重程度之间的关系。我们假设在 MMPRT 急性发作后的短期随访期间，MME 测量与发病后时间相关。
研究了 46 例有明确后内侧疼痛弹响声病史的患者。所有患者均通过 MRI 检查诊断为有症状的 MMPRT。在疼痛弹响声事件后 12 个月内使用 MRI 扫描测量绝对 MME。评估损伤至 MRI 检查时间与绝对 MME 之间的相关系数。
MRI 测量的平均绝对 MME 为 4.5±1.6mm（范围 1.1-8.8mm）。MME 测量值与损伤至 MRI 检查时间之间存在良好的相关性（R=0.612）。预测每个值的最佳拟合方程为：MME=0.014×疾病持续时间+3.288mm。
本研究表明，在 MMPRT 出现症状后的短时间内，绝对 MME 逐渐增加。我们的结果表明，术前 MME 评估可能对确定 MMPRT 的发病后时间和治疗策略很重要。
回顾性队列研究 IV 级。
