Validation of a Commercially Available Markerless Motion-Capture System for Trunk and Lower Extremity Kinematics During a Jump-Landing Assessment.

摘要: CONTEXT Field-based, portable motion-capture systems can be used to help identify individuals at greater risk of lower extremity injury. Microsoft Kinect-based markerless meet these requirements; however, until recently, were generally not automated, required substantial data postprocessing, and commercially available. OBJECTIVE To validate the kinematic measures a available system. DESIGN Descriptive laboratory study. SETTING Laboratory. PATIENTS OR OTHER PARTICIPANTS A total 20 healthy, physically active university students (10 males, 10 females; age = 20.50 ± 2.78 years, height 170.36 9.82 cm, mass 68.38 10.07 kg, body index 23.50 2.40 kg/m2). INTERVENTION(S) Participants completed 5 jump-landing trials. Kinematic simultaneously recorded using stereophotogrammetric systems. MAIN OUTCOME MEASURE(S) Sagittal- frontal-plane trunk, hip-joint, knee-joint angles identified initial ground contact jump landing (IC), for maximum joint angle during phase (MAX), joint-angle displacement from IC MAX (DSP). Outliers removed, averaged across We intraclass correlation coefficients (ICCs [2,1]) assess intersystem reliability paired-samples t test examine mean differences (α ≤ .05). RESULTS Agreement existed between (ICC range -1.52 0.96; ICC average 0.58), with 75.00% (n 24/32) being validated (P was better sagittal- 0.84) than 0.35) measures. best 0.77) compared 0.56) DSP 0.41) Pairwise comparisons 18.75% (6/32) Fewer observed (0.00%; 0/15) (35.29%; 6/17) Between-systems equivalent (18.18%; 2/11), (20.00%; 2/10). The system underestimated sagittal-plane (86.67%; 13/15) overestimated (76.47%; 13/17). No trends overestimating or underestimating IC, MAX, CONCLUSIONS Moderate agreement Better larger (eg, sagittal plane, MAX) smaller frontal IC) angles. had worst agreement. Markerless may clinicians