Reliability and Concurrent Validity of a Markerless, Single Camera, Portable 3D Motion Capture System for Assessment of Glenohumeral Mobility.
Ofra Pottorf, Daniel Vapne, Jamie Ghigiarelli and 1 others
PMID 37795320WHAT IT FOUND
A single-camera 3D motion capture system showed good agreement with goniometers for shoulder flexion and external rotation, but poor reliability for abduction and internal rotation.
It is not yet a consistent replacement for standard tools.
Key findings
01The 3D system had good overall reliability but varied by movement, with poor reliability for abduction and internal rotation.
02Concurrent validity with a goniometer was high for external and internal rotation but only moderate for abduction and flexion.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTsWhat it means for SLPs
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What it does not show
The study included only healthy individuals, so results may not apply to patients with shoulder pathology, pain, or neuromuscular conditions. Reliability was poor for two of the four movements tested (abduction and internal rotation) for the 3D system. The study was conducted in a controlled setting with standardized verbal cues and practice trials, which may not reflect typical clinical environments. One author is an employee of the company that makes the device, and another is a consultant, which introduces potential bias.
Declared interests
One author is an employee of Kinotek, Inc., and another is an independent consultant and advisor for Kinotek, Inc.
The easy way to misread this
Do not assume this 3D system is equally reliable for all shoulder movements. It showed poor reliability for abduction and internal rotation, meaning measurements for these specific actions may be inconsistent.