This project seeks to quantify the mechanical and neuromuscular changes in the extensor mechanism of patellofemoral pain patients with patellar malalignment and with/without patellar taping. Patellofemoral pain is one of the most common complaints in sports medicine clinics. It is hypothesized that load sharing among the quadriceps, the contraction delay and mechanical actions at the knee of individual quadriceps heads, and patellar tracking are changed significantly by patellar malalignment. To determine in vivo isometric knee extension load sharing among the quadriceps components, electrical stimulation of different intensities will be used to activate an individual quadriceps head selectively at various contraction levels, and the relationship between the M-wave and isometric knee extension moment over different contraction levels will be established for each quadriceps head. Next, the subject will voluntarily generate certain levels of isometric knee extension torque and the same electrodes used to record the M-wave signals will be used to measure the EMG signals. The above relationship between the M-wave and extension torque of each quadriceps head will be used to relate an individuals muscle's EMG to the individual muscle's torque and thus determine load sharing among the quadriceps components. Changes in load sharing between vastus medialis oblique and vastus lateralis caused by patellar malalignment will be quantified. In addition, contraction delay (from the onset of activation of an individual quadriceps component to the onset of joint torque generated solely by the same individual quadriceps component) and mechanical actions of the individual quadriceps components will be determined by activating a quadriceps head selectively and measuring the resultant knee flexion-extension, abduction-adduction, and internal-external rotation moments. Patellar tracking induced during knee extension will be quantified noninvasively using an optoelectrical system and using a fluoroscope. Changes in the above properties induced by patellar malalignment and correction induced by patellar taping will be quantified using the above designs.

Agency
National Institute of Health (NIH)
Institute
National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS)
Type
Research Project (R01)
Project #
3R01AR045634-02S1
Application #
6207357
Study Section
Geriatrics and Rehabilitation Medicine (GRM)
Program Officer
Panagis, James S
Project Start
1998-12-18
Project End
2000-06-30
Budget Start
1999-12-01
Budget End
2000-06-30
Support Year
2
Fiscal Year
2000
Total Cost
$28,813
Indirect Cost
Name
Rehabilitation Institute of Chicago
Department
Type
DUNS #
068477546
City
Chicago
State
IL
Country
United States
Zip Code
60611
Tsai, Liang-Ching; Lee, Song Joo; Yang, Aaron J et al. (2015) Effects of Off-Axis Elliptical Training on Reducing Pain and Improving Knee Function in Individuals With Patellofemoral Pain. Clin J Sport Med 25:487-93
Chang, Alison H; Lee, Song Joo; Zhao, Heng et al. (2014) Impaired varus-valgus proprioception and neuromuscular stabilization in medial knee osteoarthritis. J Biomech 47:360-6
Kang, Sang Hoon; Lee, Song Joo; Zhang, Li-Qun (2014) Real-time tracking of knee adduction moment in patients with knee osteoarthritis. J Neurosci Methods 231:9-17
Park, Hyung-Soon; Ahn, Chulhyun; Fung, David T et al. (2010) A knee-specific finite element analysis of the human anterior cruciate ligament impingement against the femoral intercondylar notch. J Biomech 43:2039-42
Lin, Fang; Wilson, Nicole A; Makhsous, Mohsen et al. (2010) In vivo patellar tracking induced by individual quadriceps components in individuals with patellofemoral pain. J Biomech 43:235-41
Lin, Fang; Wang, Guangzhi; Koh, Jason L et al. (2004) In vivo and noninvasive three-dimensional patellar tracking induced by individual heads of quadriceps. Med Sci Sports Exerc 36:93-101
Makhsous, Mohsen; Lin, Fang; Koh, Jason L et al. (2004) In vivo and noninvasive load sharing among the vasti in patellar malalignment. Med Sci Sports Exerc 36:1768-75
Zhang, Li-Qun; Wang, Guangzhi; Nuber, Gordon W et al. (2003) In vivo load sharing among the quadriceps components. J Orthop Res 21:565-71
Lin, Fang; Makhsous, Mohsen; Chang, Alison H et al. (2003) In vivo and noninvasive six degrees of freedom patellar tracking during voluntary knee movement. Clin Biomech (Bristol, Avon) 18:401-9
Zhang, Li-Qun; Nuber, Gordon W; Bowen, Mark K et al. (2002) Multiaxis muscle strength in ACL deficient and reconstructed knees: compensatory mechanism. Med Sci Sports Exerc 34:2-8

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