Greater trochanter location measurement using a three-dimensional motion capture system during prone hip extension.
Ji-Su Yu, Jae-Seop Oh
PMID 28265151WHAT IT FOUND
In healthy adults during prone hip extension, a motion-capture method that calculated greater trochanter location from thigh markers, rather than placing a marker on the trochanter, gave more consistent migration measurements and thigh lengths closer to tape-measured length.
Key findings
01When the greater trochanter location was calculated from thigh markers instead of measured from a marker on the trochanter, migration distance differed significantly (p<0.001) and variation was lower.
02Thigh length calculated from thigh markers was not significantly different from tape-measured length (p=0.200), while the marker-on-trochanter method was not comparable with original length or the calculated method (p<0.001).
03Agreement with tape-measured thigh length was better for the thigh-marker method than for the trochanter-marker method or between the two methods.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
Only 20 healthy young adults were studied, and all were right-leg dominant. The greater trochanter location was tested only during prone hip extension to 15°, so it does not show what happens across other movements or in people with hip pain. The study did not compare the motion-capture estimates with the actual greater trochanter location. The sample size and single movement limit certainty, and no clinical outcomes were measured.
The easy way to misread this
Do not use this to change clinical palpation or diagnosis. The study tested only healthy adults during prone hip extension and did not compare either method with the actual greater trochanter location. It is a measurement method study, not a treatment trial.