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Reporter: Chao-jung Hsieh Supervisor : Sai-wei Yang Date: 2007/6/11

The Influence of Vastus Muscle on Patella Alignment and Balance in Subjects With Patellofemoral Pain Syndrome. Reporter: Chao-jung Hsieh Supervisor : Sai-wei Yang Date: 2007/6/11. Introduction. Patellofemoral pain syndrome (PFPS)

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Reporter: Chao-jung Hsieh Supervisor : Sai-wei Yang Date: 2007/6/11

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  1. The Influence of Vastus Muscle on Patella Alignment and Balance in Subjects With Patellofemoral Pain Syndrome Reporter: Chao-jung Hsieh Supervisor: Sai-wei Yang Date: 2007/6/11

  2. Introduction • Patellofemoral pain syndrome (PFPS) • Peripatellar or retropatellar pain results from physical and biomechanical changes in the patellofemoral joint • Subjects with PFPS have more symptoms and pain during the last 30° of maximal sitting knee extension Thomee et al 1995

  3. Pathomechanics Bony Alignment Soft Tissue Increased Q angle Patella malalignment Femoral anteversion Insufficient flexibility Strength deficit Abnormal biomechanics Abnormal patella tracking Excessive pressure on patellofemoral joint Patellofemoral pain syndrome

  4. Literature review • The EMG activity of the vastus medialis oblique is pronounced at the end-range of extension which emphasizes the function of the structure in providing medial patella stability Fulkerson 1990 • Effective control of balance also relies on a timely response of strong muscles

  5. Purpose • To investigate the influence of vastus muscle and patella alignment in subjects with PFPS • To evaluate the relationship of impairment of balance and muscle strength of the knee Hypothesis • Vastus medialis oblique and vastus lateralis muscle imbalance would be associated with • Lateral patella tracking • Poor balance

  6. Methods • Subjects: 30 subjects diagnosed with PFPS • Preliminary examination: • Postural alignment • Leg length • Femoral anteversion • Tibial torsion • Q angle • Muscle flexibility test • Estimating the pain intensity: visual-analog scale

  7. Methods • Condition: during muscle isokinetic contraction • Variables: • Patella alignment • Lateral patella angle • Lateral patella displacement • Vastus medialis oblique and vastus lateralis • Electrical activity (EA)-muscle activity Measured at 30°.45° and 60° of knee flexion

  8. Methods • Equipments • Electromyography • Isokinetic dynamometer • Stewart platform

  9. References • Christopher MP(2000) Patellar kinematics, part I: The influence of vastus muscle activity in subjects with and without patellofemoral pain. Physical therapy. 10:956-964 • Davies AP, Bayer J(2004) The optimum knee flexion angle for skyline radiography is thirty degrees. Clinical orthopaedics and related research. 423:166-171 • Goran MH, Alwin L, Matthias J(2000) Methodologies for evaluating electromyographic field data in ergonomics. Journal of electromyography and kinesiology. 10:301-312

  10. Thanks for your listening

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