Kinematic analysis of upper limb coordination during a multi-directional reaching task: specific examination of shoulder girdle movement.
Konoka Kikuchi, Kenichi Murakami, Hiroyuki Fujisawa
PMID 37266368WHAT IT FOUND
Reaching motions across 12 directions rely on specific combinations of the shoulder, elbow and collarbone joints.
For movements directly across the body, the shoulder joint does most of the work while the other two stay largely fixed. In other directions, all three joints coordinate together.
Key findings
01The range of motion for the sternoclavicular, shoulder and elbow joints varied significantly depending on the direction of the reach.
02Reaching motions were performed with different joint strategies: some used all three joints, some used only the shoulder, and some used only the sternoclavicular and elbow joints.
03In specific directions (T3 and T8), the shoulder joint played the main role while the sternoclavicular and elbow joints contributed little to the movement track.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
The study only included 10 healthy young adult males, so the findings may not apply to females, older adults, or people with upper limb impairments. The task was performed in a horizontal plane on an air table with the trunk fixed, which is very different from functional reaching in daily life where the trunk moves and gravity acts vertically. The study describes movement patterns but does not test any intervention or outcome, so it cannot tell you if this knowledge improves patient care.
Declared interests
The paper does not report any funding sources or conflicts of interest.
The easy way to misread this
Do not assume these joint coordination patterns apply to your patients. The study measured healthy young men in a highly controlled, artificial setting with the trunk fixed and friction removed, so it does not represent how an injured or older person moves in real life.