Lei Shu1, Xu Yang1, Hangyuan He1, Biao Chen1, Liaobin Chen2, Qubo Ni3. 1. Department of Orthopedic Surgery, Zhongnan Hospital of Wuhan University, Wuhan, 430071, China. 2. Department of Orthopedic Surgery, Zhongnan Hospital of Wuhan University, Wuhan, 430071, China. lbchen@whu.edu.cn. 3. Department of Orthopedic Surgery, Zhongnan Hospital of Wuhan University, Wuhan, 430071, China. niqubo@znhospital.cn.
Abstract
BACKGROUND: To investigate the morphological parameters of the vastus medialis obliquus (VMO) muscle and delineate its importance in the maintenance of patellofemoral joint stability. METHODS: 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. RESULTS: 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). CONCLUSIONS: The results showed that abnormalities in the VMO and patella tilt were clearly present in recurrent LPD patients compared with normal people.
BACKGROUND: To investigate the morphological parameters of the vastus medialis obliquus (VMO) muscle and delineate its importance in the maintenance of patellofemoral joint stability. METHODS: 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. RESULTS: 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). CONCLUSIONS: The results showed that abnormalities in the VMO and patella tilt were clearly present in recurrent LPD patients compared with normal people.
Authors: Saikat Pal; Christine E Draper; Michael Fredericson; Garry E Gold; Scott L Delp; Gary S Beaupre; Thor F Besier Journal: Am J Sports Med Date: 2010-11-12 Impact factor: 6.202
Authors: S Evan Carstensen; Scott M Feeley; M Tyrrell Burrus; Matthew Deasey; Jeremy Rush; David R Diduch Journal: Arthroscopy Date: 2020-04-28 Impact factor: 4.772
Authors: Christine E Draper; Thor F Besier; Michael Fredericson; Juan M Santos; Gary S Beaupre; Scott L Delp; Garry E Gold Journal: J Orthop Res Date: 2010-10-14 Impact factor: 3.494
Authors: Betina B Hinckel; Riccardo G Gobbi; Eduardo N Kihara Filho; Marco K Demange; José Ricardo Pécora; Gilberto Luis Camanho Journal: Orthop J Sports Med Date: 2015-09-02