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  • Title: Quadriceps femoris strength and sagittal-plane knee biomechanics during stair ascent in individuals with articular cartilage defects in the knee.
    Author: Thoma LM, Flanigan DC, Chaudhari AM, Siston RA, Best TM, Schmitt LC.
    Journal: J Sport Rehabil; 2014 Aug; 23(3):259-69. PubMed ID: 25115158.
    Abstract:
    CONTEXT: Few objective data are available regarding strength and movement patterns in individuals with articular cartilage defects (ACDs) of the knee. OBJECTIVES: To test the following hypotheses: (1) The involved limb of individuals with ACDs would demonstrate lower peak knee-flexion angle, peak internal knee-extension moment, and peak vertical ground-reaction force (vGRF) than the contralateral limb and healthy controls. (2) On the involved limb of individuals with ACDs, quadriceps femoris strength would positively correlate with peak knee-flexion angle, peak internal knee-extension moment, and peak vGRF. DESIGN: Cross-sectional. SETTING: Biomechanics research laboratory. PARTICIPANTS: 11 individuals with ACDs in the knee who were eligible for surgical cartilage restoration and 10 healthy controls. METHODS: Quadriceps femoris strength was quantified as peak isometric knee-extension torque via an isokinetic dynamometer. Sagittal-plane knee kinematics and kinetics were measured during the stance phase of stair ascent with 3-dimensional motion analysis. MAIN OUTCOME MEASURES: Quadriceps strength and knee biomechanics during stair ascent were compared between the involved and contralateral limbs of participants with ACD (paired t tests) and with a control group (independent-samples t tests). Pearson correlations evaluated relationships between strength and stair-ascent biomechanics. RESULTS: Lower quadriceps strength and peak internal knee-extension moments were observed in the involved limb than in the contralateral limb (P < .01) and the control group (P < .01). For the involved limb of the ACD group, quadriceps femoris strength was strongly correlated (r = .847) with involved-limb peak internal knee-extension moment and inversely correlated (r = -.635) with contralateral peak vGRF. CONCLUSIONS: Individuals with ACDs demonstrated deficits in quadriceps femoris strength with associated alterations in movement patterns during stair ascent. The results of this study are not comprehensive; further research is needed to understand the physiological characteristics, activity performance, and movement quality in this population.
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