Acromiohumeral distance changes with posture in healthy adults and patients while wearing a shoulder abduction brace.
Hajime Ito, Teruhiko Kawakami
PMID 37529063WHAT IT FOUND
While wearing a shoulder abduction brace, the space between the acromion and humeral head was smaller lying down than sitting in healthy adults and postoperative patients.
The authors recommend supporting the elbow when lying down.
Key findings
01In healthy adults wearing an abduction brace, the acromiohumeral distance decreased from 7.9 ± 1.1 mm in sitting to 7.2 ± 1.0 mm in supine, a statistically significant decrease.
02In postoperative patients wearing an abduction brace, the acromiohumeral distance decreased from 7.6 ± 0.9 mm in sitting to 6.3 ± 1.1 mm in supine, a statistically significant reduction.
03Multiple regression showed no effect of age, height, or weight on the acromiohumeral distance in either position in either group.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
Only 15 healthy adults and 15 postoperative patients were measured, so the estimate is based on a small sample. Ultrasound measured the humeral head position in the sagittal plane only, so it cannot fully describe position in all three planes. The study used one examiner and one measurement per position, and the paper notes that inter-rater reliability for this ultrasound measurement was not established. All measurements were taken while wearing the brace, so the study cannot show whether the brace itself changes the posture-related narrowing. The study did not measure pain, function, or healing outcomes, so it cannot show whether the observed posture-related narrowing matters clinically. The postoperative patients were described as being in the acute stage after arthroscopic repair, so results may not apply to later recovery.
Declared interests
The author has no conflict of interest to disclose.
The easy way to misread this
Do not conclude that supporting the elbow with a pillow or towel prevents pain or protects the repair. The study measured acromiohumeral distance only and did not test the pillow or towel advice or measure pain.