Hip, knee, and ankle kinematics during activities of daily living: a cross-sectional study.
Kashitaro Hyodo, Tadashi Masuda, Junya Aizawa and 2 others
PMID 28473283WHAT IT FOUND
Healthy adults used far more hip and knee motion for self-care than for walking or stairs.
Crouching and getting out of the bath required up to 101 degrees of hip flexion and 149 degrees of knee flexion, exceeding typical post-surgery limits.
Key findings
01Self-care activities require significantly larger joint angles than basic mobility tasks like walking or climbing stairs.
02Trunk rotation during crouching demanded the highest hip flexion (101 degrees) and knee flexion (149 degrees) among all measured tasks.
03No task in healthy individuals showed simultaneous hip adduction and internal rotation, which is a position often restricted after hip replacement due to dislocation risk.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTs
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What it does not show
Participants were healthy young adults (mean age 20), so the movement patterns may not reflect those of older adults or patients with pain or stiffness. Only the dominant leg was measured, which may not represent bilateral movement strategies. The study did not measure patients with restricted range of motion, so it provides reference targets rather than direct evidence of patient performance. Video motion analysis was not performed simultaneously, making it difficult to verify the exact body mechanics during complex movements.
Declared interests
The authors declare no conflicts of interest.
The easy way to misread this
Do not assume that healthy adult kinematics are directly applicable to patients with joint restrictions. Patients may compensate with different movement strategies, and this study provides reference values for normal motion, not a description of how patients with limited range of motion actually perform these tasks.