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Patients preparing for partial or total knee arthroplasty may report similar pain and function and demonstrate similar movement patterns at their usual walking speed. But what happens when the task becomes more demanding? Researchers from McMaster University and St. Joseph’s Healthcare Hamilton used Theia3D markerless motion capture to evaluate patients with end-stage knee osteoarthritis before surgery.

This article is the third and final installment in a miniseries exploring what motion capture can show beyond radar, ball data, and standard video. In this installment, Dean pairs Biodex testing with Theia3D motion capture to examine two sides of pitching fatigue: how posterior rotator cuff performance changes across a bullpen, and whether the pitcher’s full-body mechanics change from the first inning to the last.

A study published in Biomechanics compared two earlier versions of Theia3D with a marker-based motion capture system during a simulated basketball-throwing task. Thirteen healthy adults completed five throws without a ball while researchers simultaneously recorded marker-based and markerless data at 120 Hz. The analysis compared sagittal-plane flexion at the knee, hip, shoulder, elbow and wrist.