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- Title
Tibiofemoral Joint-Surface Motions in Weight-Bearing and Non-Weight-Bearing Movement.
- Authors
Hollman, John H.; Deusinger, Robert H.; Van Dillen, Linda R.; Zou, Dequan; Minor, Scott D.; Matava, Matthew J.; Engsberg, Jack R.
- Abstract
Context: Analyses of the path of instant center of rotation (PICR) can be used to infer joint-surface rolling and sliding motion (arthrokinematics). Previous PICR research has not quantified arthrokinematics during weight-bearing (WB) movement conditions or studied the association of muscle activity with arthrokinematics. Objective: To examine tibiofemoral arthrokinematics and thigh-muscle EMG during WB and non-weight-bearing (NWB) movement. Design: 2 × 9 repeated-measures experiment. Setting: Laboratory. Participants: 11 healthy adults (mean age 24 years). Main Outcome Measures: Tibiofemoral percentage rolling arthrokinematics and quadriceps: hamstring EMG activity. Results: WB percentage rolling (76.0% ± 4.7%) exceeded that of NWB (57.5% ± 1.8%) through terminal knee extension (F[sub 8,80] = 8.99, P < .001). Quadriceps:hamstring EMG ratios accounted for 45.1% and 34.7% of the variance in arthrokinematics throughout the WB and NWB movement conditions, respectively (P < .001 ). Conclusions: More joint-surface rolling occurs through terminal knee extension during WB movement and is associated with an increase in hamstring activity.
- Subjects
BIOMECHANICS; JOINTS (Anatomy); TIBIA
- Publication
Journal of Sport Rehabilitation, 2003, Vol 12, Issue 2, p143
- ISSN
1056-6716
- Publication type
Article
- DOI
10.1123/jsr.12.2.143