Changes in scapular and trunk angles and postural control during right-left hand-behind-back movement.

Only 20 young, healthy, right-handed adults were measured, and people with shoulder, trunk, or neurological problems were excluded, so results may not apply to older adults, left-handed people, women, or patients with shoulder or trunk disease. Participants had to reach the eighth thoracic vertebra with the hand-behind-back movement, so people with more limited movement were not included. The movement was performed along a fixed path near the spinous processes because of marker placement, so results may change if the hand-behind-back movement is performed differently. Angles and foot-pressure measures may contain errors from skin markers and the rigid-body model. This was an observational movement study, not a treatment trial, so it did not test whether changing trunk or foot-pressure patterns improves hand-behind-back movement.

The authors declared no conflicts of interest, and the research did not receive specific funding.

Do not conclude that the right and left hands move differently during hand-behind-back movement. The study found no difference between the right and left hands in scapular rotation, trunk rotation, or foot-pressure change.