Single leg squat analysis in 2 minutes

Single leg squat, or SLS for short, can be used by physical therapists, athletic trainers, and/or performance coaches to gauge the active range of motion, strength, and instabilities of an athlete or patient. In the two minute video below, weekend warrior (at best) Boris performs SLS on both left and right legs. EuMotus physiotherapist-in-residence Merci breaks down the SLS form using EuMotus markerless motion capture in 2 minutes.


This is BodyWatch by EuMotus. Here we have a demonstration of single leg squat on the left and the right legs. As Boris steps into the frame [of view] the system automatically locks into each of his joints and will measure them in three dimensions (3D). Here it is tracking his pelvis, his knees, and his ankles during the movement. Knee varus and valgus are recorded as femur external and internal rotation in the report. Next he'll do the same thing [SLS] but on the right left.

During this movement, his right left is somewhat occluded by his left, but that will be sorted out in the data smoothing. Next up is the report card. On the report card we flag any movement errors, so his knee active range of motion left and right are recorded in the circles. We can see that his knee stability left and right show femur internal rotation, also known as valgus. We also look at information regarding his pelvis, torso, shoulders, and neck during these movements.

Next up we have the graph mode where we plot his knee flexion and extension on the left, and compare that with femur rotation on the left as he moves. So as we can see during maximum knee flexion, we can see that he shows most valgus, which is displayed as any values dropping below zero of the yellow line.

As we can see, Merci performed a quick ~2 minute analysis of Boris' SLS. The quick recording and analysis is enabled by a single 3D sensor fully markerless mocap system (i.e. no complicated setup, finicky markers, or calibration), and machine learning algorithms that prioritize faults and do away with the need for post-processing of data.

The practitioner is able to dig deeper, look beyond knee valgus, and examine other movements and instabilities of interest - e.g. pelvic rotation, torso rotation, examining relative to knee flexion etc.

Have questions or want to request a demo? Send us a note to hello /at /eumotus /com.

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