Department of Orthopedic Surgery, Zhongnan Hospital of Wuhan University, Wuhan, 430071, China.
BMC Med Imaging. 2021 Jan 6;21(1):3. doi: 10.1186/s12880-020-00542-8.
To investigate the morphological parameters of the vastus medialis obliquus (VMO) muscle and delineate its importance in the maintenance of patellofemoral joint stability.
The magnetic resonance imaging data of seventy-five knees (fifty-four patients) with recurrent lateral patella dislocation (LPD) and seventy-five knees (seventy patients) without recurrent LPD were retrospectively analysed. Five morphological parameters related to the VMO (elevation in the sagittal plane and coronal plane, craniocaudal extent, muscle-fibre angulation, cross-sectional area ratio) and two patella tilt parameters (patella tilt angle, bisect offset ratio) were measured in MR images. The independent-samples t test or chi-square test was used for statistical comparisons.
The mean ages of the patients in the recurrent LPD group and control group were 22.1 ± 9.9 years and 24.0 ± 6.5 years, respectively. Eighteen out of seventy-five (24%) patients MRI showed VMO injuries. Compared with the control group, the patients with recurrent LPD showed significantly higher sagittal VMO elevation (10.4 ± 2.3 mm vs. 4.1 ± 1.9 mm), coronal VMO elevation (15.9 ± 5.7 mm vs. 3.9 ± 3.7 mm), muscle-fibre angulation (35.4 ± 8.0° vs. 27.9 ± 6.3°), patella tilt angle (25.9 ± 10.7° vs. 9.1 ± 5.2°), and bisect offset ratio values (0.9 ± 0.3 vs. 0.5 ± 0.1) and significantly lower craniocaudal extent (13.7 ± 5.3 mm vs. 16.7 ± 5.1 mm) and cross-sectional area ratio values (0.05 ± 0.02 vs. 0.07 ± 0.02).
The results showed that abnormalities in the VMO and patella tilt were clearly present in recurrent LPD patients compared with normal people.
研究股直肌外侧头（VMO）的形态学参数，并探讨其在维持髌股关节稳定性中的重要性。
回顾性分析 75 例（54 例患者）复发性外侧髌骨脱位（LPD）和 75 例（70 例患者）无复发性 LPD 的膝关节磁共振成像（MRI）数据。在 MRI 图像上测量 5 个与 VMO 相关的形态学参数（矢状面和冠状面的抬高、颅尾延伸、肌纤维角度、横截面积比）和 2 个髌骨倾斜参数（髌骨倾斜角、平分线偏移比）。采用独立样本 t 检验或卡方检验进行统计学比较。
复发性 LPD 组和对照组患者的平均年龄分别为 22.1±9.9 岁和 24.0±6.5 岁。75 例患者中，18 例 MRI 显示 VMO 损伤。与对照组相比，复发性 LPD 患者的矢状面 VMO 抬高（10.4±2.3mm 比 4.1±1.9mm）、冠状面 VMO 抬高（15.9±5.7mm 比 3.9±3.7mm）、肌纤维角度（35.4±8.0°比 27.9±6.3°）、髌骨倾斜角（25.9±10.7°比 9.1±5.2°）和平分线偏移比（0.9±0.3 比 0.5±0.1）均显著升高，颅尾延伸（13.7±5.3mm 比 16.7±5.1mm）和横截面积比（0.05±0.02 比 0.07±0.02）显著降低。
结果表明，与正常人相比，复发性 LPD 患者的 VMO 和髌骨倾斜异常明显。
