Medial collapse of the lower extremity during landing often has been proposed and observed as a mechanism for knee injury. Risk for this mechanism of injury is believed to be heightened during frequently occurring single-limb landings. We defined regular physical activity as participation in activity for a minimum of 30 minutes 3 times per week. The same tester J. This distance was chosen based on pilot testing in which we observed that participants often self-selected this position for comfort. People with greater anteversion have been observed as having greater IR relative to ER.
Asymmetry of unilateral hip rotation alone was predictive of hip and knee adduction excursions during landing. Participants then completed a 5-minute warmup on a stationary exercise bicycle at a self-determined intensity level. Exploring the relationship among multiple factors that might influence landing mechanics provides additional information to the clinician for assessment and intervention. Inclusion criteria for participation were self-reported regular physical activity, no history of lower extremity injury in the 6 months before the study, no history of lower extremity surgery, age between 18 and 25 years, and willingness to participate in the study. The same tester J. Factors that warrant consideration might include nonmodifiable factors, such as lower extremity structural alignment and sex, or modifiable factors, such as strength. We used 14 in of spacing, which was novel to our study, to attempt to standardize limb position and control for variations in hip motion resulting from different amounts of abduction. Correlations and linear regression analyses were used to assess relationships among AUHR, RAD, sex, peak hip abduction—external rotation torque, and kinematic variables for 3-dimensional motion of the hip and knee. Greater amounts of pronation have been observed in patients with ACL injuries. The dependent variables were joint angles at contact and joint excursions between contact and peak knee flexion. Whereas many authors 10—13 have suggested that femoral anteversion could influence the landing mechanics associated with anterior cruciate ligament ACL injuries, only Loudon et al 12 have attempted to measure femoral anteversion in patients with ACL injuries. It also might be accompanied by pronation. Patients or Other Participants: Their method consisted of subtracting ER from IR range of motion. A standard goniometer modified with the addition of a bubble level to ensure vertical alignment of the reference arm was used to measure IR and ER in degrees. Asymmetry of unilateral hip rotation and sex were predictive of knee external rotation excursion during landing. Therefore, the purpose of our study was to determine the relationship among measurements of AUHR; mobility of the foot, which we described as relative arch deformity RAD ; hip abduction—ER strength; sex; and medial collapse of the knee during a single-leg jump landing. Similarly, less hip abduction strength has been associated with greater medial knee collapse among women. Both distal and proximal structural alignment might influence knee motion. Understanding these relationships might help clinicians better identify factors that contribute to joint positions associated with medial collapse and potential knee injury. All participants provided written informed consent, and the study was approved by the Institutional Review Board of the University of Kentucky. Participants were instructed to actively flex their knees and to allow their hips to rotate internally and then externally under the force of gravity to their passive limit. People with greater anteversion have been observed as having greater IR relative to ER. Asymmetry of unilateral hip rotation, sex, and hip strength were associated with kinematic components of medial knee collapse. We hypothesized that AUHR and RAD would be positively correlated with movements often associated with medial collapse of the knee, including hip adduction and IR excursions and knee abduction and rotation excursions. The intraclass correlation coefficients 2,1 were 0. We defined regular physical activity as participation in activity for a minimum of 30 minutes 3 times per week.
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