Tibiofemoral Joint-Surface Motions in Weight-Bearing and Non-Weight-Bearing Movement

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John H. Hollman
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Robert H. Deusinger
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Linda R. Van Dillen
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Dequan Zou
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Scott D. Minor
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Matthew J. Matava
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Jack R. Engsberg
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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 x 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 (F8,80 = 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.

Hollman is with the Dept of Physical Therapy, Clarke College, Dubuque, IA 52001. Deusinger, Van Dillen, Zou, and Minor are with the Program in Physical Therapy, and Matava, the Dept of Orthopaedic Surgery, Washington University School of Medicine, St Louis, MO 63108. Engsberg is with the Human Performance Laboratory, Barnes-Jewish Hospital, St Louis, MO 63108.

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