Validating scapular motion measurements using an optical motion analyzer and gravity magnetic resonance imaging.
Yushin Mizuno, Hiroichi Miaki, Naoki Ohno and 2 others
PMID 37131356WHAT IT FOUND
Scapular motion measured by optical markers agreed with gravity MRI only in three specific positions.
In most movements, including abduction changes, the two methods did not match. Clinicians should interpret marker-based scapular data with caution.
Key findings
01Agreement between optical motion analysis and gravity MRI was found only for scapular upward/downward rotation at 140° and 160° of flexion and 120° of abduction, and for internal/external rotation at 140° of abduction.
02No agreement was observed for scapular upward/downward rotation at 100°, 140°, or 160° of abduction, nor for changes in scapular angle from 100° of abduction.
03The study concluded that scapular motion measurements from optical motion analysis are poorly consistent with gravity MRI angular change measurements.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
The study included only 12 healthy males, limiting generalizability to patients with shoulder dysfunction or other demographics. Measurements were not taken simultaneously by the two instruments, which may affect comparability. Scapular motion was evaluated only in two dimensions, while actual movement is three-dimensional. The experimental environment limited the range of shoulder motion angles and types that could be tested. Skin movement artifacts were a potential source of error for the optical motion analysis.
Declared interests
The research was not funded by any specific agency, and the authors declared no conflicts of interest.
The easy way to misread this
Do not assume that optical motion analysis provides valid data for all scapular movements. The study found agreement with MRI in only a few specific positions, suggesting that marker-based measurements may be inaccurate for many clinical assessments.