Abnormal Joint Moment Distributions and Functional Performance During Sit-to-Stand in Femoroacetabular Impingement Patients.
Michael A Samaan, Benedikt J Schwaiger, Matthew C Gallo and 4 others
PMID 27729286WHAT IT FOUND
People with symptomatic hip impingement took 0.6 seconds longer to stand up, put less relative load on the knee, trended toward more hip effort, and loaded more slowly, without clear weight-bearing asymmetry.
Key findings
01Patients with FAI took on average 0.6 seconds longer to perform the sit-to-stand task than controls.
02FAI patients showed an 11.8% decrease in knee contribution to total support moment and an 11.6% trend toward increased hip contribution, while total support moment was similar.
03FAI patients had a 37.9% lower loading rate and reached peak vertical ground reaction force later, but had similar peak force and symmetry index.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTs
Read the rest of this summary
You get three full summaries a month, free, and we do not ask for a card. Search, the TL;DRs and your library stay unlimited either way.
What it does not show
The study included only 17 patients with FAI and 31 controls, so the estimates may be imprecise. It was observational and did not test any treatment, so it cannot show that altered mechanics cause symptoms or that changing them helps. Hip muscle strength and muscle activity were not measured, so the study cannot say which muscles drove the joint moment differences. Trunk and pelvis mechanics were not analysed, so upper body strategies may have influenced the sit-to-stand pattern. The start of the sit-to-stand task was not marked by an instrumented seat, and timing definitions differ across studies, which makes comparisons difficult. FAI subtypes were few and did not affect outcomes, so the study cannot say how cam, pincer or mixed FAI differ. Controls came from a separate longitudinal study cohort, not from recruitment designed for this comparison.
The easy way to misread this
Do not conclude that sit-to-stand training or changing hip and knee effort will help patients with FAI. No treatment was tested, peak joint moments were similar, and the hip contribution increase was only a trend.