Kinematic variability and local dynamic stability of gait in individuals with hip pain and a history of developmental dysplasia.
Kari L Loverro, Anne Khuu, Pei-Chun Kao and 1 others
PMID 30639795WHAT IT FOUND
Twelve people with hip pain and a history of developmental dysplasia of the hip showed more variable hip, pelvis and trunk movement than twelve matched controls.
Trunk stability was not different. Faster walking changed variability and stability differently.
Key findings
01At a fixed treadmill speed, the hip pain group had greater variability in hip, pelvis and trunk movement and in stride length than controls.
02Trunk local dynamic stability did not differ between groups at any tested speed.
03Walking speed changed variability and stability differently: preferred speed had greater ankle, knee and hip variability, while fast speed had greater trunk stability in side-to-side and forward directions.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
Only 12 people with hip pain and 12 controls were studied. The hip pain group included people with pain on one side, people with pain on both sides, and people who had had hip surgery, so the group was mixed. Controls were matched for activity level, which may have made it harder to detect differences in gait stability. Walking speeds were tested in a fixed order, not randomly, and the fast speed was always after the preferred speed. Trunk stability was measured from the neck marker rather than a marker near the hip. The treadmill was set to a constant speed, which may change variability and stability compared with overground walking. The walking tasks may not have been hard enough to produce pain-related changes in trunk stability.
Declared interests
The authors declared no conflicts of interest.
The easy way to misread this
Do not read the greater hip, pelvis and trunk variability as proof of unstable walking or fall risk. The study found no difference in trunk local dynamic stability between groups, and it included only 12 people in each group.