Differences in the total hip rotation range of motion between sides in healthy young Japanese adults.
Heonsoo Han, Akira Kubo, Masahiro Ishizaka and 1 others
PMID 33519076WHAT IT FOUND
The left-right difference in total hip rotation was similar in men and women.
In healthy young Japanese students, left and right total hip rotation were usually close, but some had unusually large differences.
Key findings
01Among 205 healthy young Japanese students, the left side's share of combined total hip rotation ranged from 44.5% to 56.1%.
02The pattern of left-right difference in total hip rotation was similar in men and women.
03Seven participants had a greater-side value at least 2 SD from the center, and two had at least 3 SD.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
The study measured healthy Japanese students aged 18 to 25, not people with pain or hip disease. It did not examine whether side-to-side hip rotation differences are related to physical characteristics or motor function. The reliability of the hip rotation measurement method was not investigated. The method required four or more people and is difficult to use in a clinic. The participants were students, so the results may not apply to older adults or other populations.
Declared interests
This study was supported by the Department of Physical Therapy of International University of Health and Welfare. The authors reported no conflicts of interest.
The easy way to misread this
Do not read a side-to-side hip rotation difference as a problem or a treatment target. This paper only describes variation in healthy young Japanese students. It did not test patients, pain, function, or whether correcting the difference helps.