Validating optical motion capture assessments of
The secret to all biomechanics and motion capture boils down to a few fairly simple equations, first proposed by Abdel-Aziz and Dr. These form the basis of what is called Direct Linear Transformation (DLT).
This is an A minor league pitcher fit these definitions a few years ago after coming to us during rehab from bone chips in his elbow.
Even if you simply project the forearm’s long axis onto a plane perpendicular to upper arm’s long axis, the carrying angle screws that up too.
The issues begin somewhere near 25-30 degrees flexion and continue up to full extension – basically the period in which the IR is maxing out.
First, a graph – this is a comparison of pronation/supination at the elbow using a marker-based system vs. Second, a statement from a biomechanist who works in an academic lab: You got me thinking again about the issues/problems with accuracy in measuring internal shoulder rotation…
with markerless/digitizing, it comes down to carrying angle of the elbow screwing up the cross-product of upper and forearm (which is how shoulder IR/ER has to be tracked if going markerless).
A good example of this is Trevor Bauer, and combined with our biomechanical reports and screenings he gets done elsewhere besides Driveline Baseball, we can tailor his program to be high-volume responsibly.
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