In-vivo quantification of dynamic hip joint center errors and soft tissue artifact.
Niccolo M Fiorentino, Penny R Atkins, Michael J Kutschke and 2 others
PMID 27693944WHAT IT FOUND
Functional hip joint center estimates are more accurate than predictive ones during movement.
Using X-ray tracking instead of skin markers reduced functional method errors to 1.3 mm, proving that soft tissue movement is the main source of error.
Key findings
01Functional methods had lower error than predictive methods when using skin markers.
02Using dual fluoroscopy reduced functional method error to 1.3 mm, confirming skin markers are the primary error source.
03Skin markers moved significantly relative to the bone during dynamic activities.
STILL TO COME
How it was doneWhat they found
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What it does not show
The study used young, healthy adults with a low BMI, so errors may be larger in patients with more soft tissue or higher BMI. Participants were exposed to ionizing radiation. Only five specific hip joint center algorithms were tested.
The easy way to misread this
Do not assume these error rates apply to clinical patients. The participants were young, lean, and healthy, so soft tissue artifact was minimized. Patients with higher BMI or hip pathology may have much larger errors.