Relationship between the EMG ratio of muscle activation and bony structure in osteoarthritic knee patients with and without patellar malalignment
| Autor: | Simon F. T. Tang, Shu-Hsia Wu, Chih-Kuang Chen, Yiu-Chung Liu, Cheng-Kung Cheng, Ngok-Kiu Chu |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Adult
Male musculoskeletal diseases Vastus medialis Radiography Physical Therapy Sports Therapy and Rehabilitation Osteoarthritis Electromyography Quadriceps Muscle medicine Humans Osteoarthritic knee Muscle Skeletal Aged medicine.diagnostic_test business.industry Rehabilitation Muscle activation Bone Malalignment Patella General Medicine Anatomy Middle Aged Osteoarthritis Knee Sulcus musculoskeletal system medicine.disease medicine.anatomical_structure Torque Isokinetic dynamometer Female business human activities Muscle Contraction |
| Zdroj: | Journal of Rehabilitation Medicine. 40:381-386 |
| ISSN: | 1650-1977 |
| Popis: | Objective: The aim of this study was to compare muscle activation patterns and patellofemoral joint morphologies between patients with knee osteoarthritis with and without patellar malalignment. Subjects: The subjects were divided into 3 groups. Group A comprised 11 patients with symptomatic knee osteoarthritis without patellar malalignment. Group B comprised 14 patients with symptomatic knee osteoarthritis with patellar malalignment. Group C comprised 10 age-matched subjects with non-knee osteoarthritis as controls. Methods: Isokinetic dynamometry with surface electromyography was used to measure maximal muscle activity in terms of vastus medialis oblique/vastus lateralis ratios. Merchant’s view was taken to analyse the bony anatomy of the patellofemoral joint. Recordings were made at angular velocities of 80, 120 and 240o/sec. Results: The electromyographic ratios of group B were lower than groups A and C for all testing velocities (p < 0.05). Group B also had larger sulcus angles, lateral patellar tilt and displacement. The electromyographic ratios correlated negatively with sulcus angles. Conclusion: Subjects with knee osteoarthritis with patellar malalignment exhibited an imbalance in quadriceps contraction, as confirmed by altered vastus medialis oblique/vastus lateralis ratios associated with larger sulcus angles of the patellofemoral joints. The sulcus angle may be an important contributing factor in causing abnormal patellar tracking in knee osteoarthritis. |
| Databáze: | OpenAIRE |
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