Article

Femoroacetabular impingement (FAI) is a morphological abnormality of
the hip joint that causes pain when performing a mechanically demanding activity
of daily living such as the sit-to-stand (STS) task. Previous studies have
assessed lower extremity joint mechanics during an STS task in various
pathologies, yet the STS task has not been studied in FAI patients.
The objective of this study was to identify differences in joint kinetics and
performance between FAI patients and healthy controls during a STS task. It was
hypothesized that FAI patients would exhibit altered time needed to complete the
STS task, as well as altered lower extremity biomechanics, when compared to
healthy controls. DESIGN: This was a cross-sectional cohort study. SETTING: The
study took place at a motion capture laboratory at an institutional orthopedic
facility. PARTICIPANTS: Biomechanical analysis was performed in 17 FAI patients
and 31 age- and body mass index (BMI)-matched healthy controls during the STS
task. METHODS: Sagittal plane joint moments, total support moment (TSM), joint
contributions to the TSM, and functional measures during the STS task were
compared between groups. MAIN OUTCOME MEASUREMENTS: Peak joint moments, TSM and
joint contributions to the TSM were assessed during the STS task. In addition,
the time to and value of the peak vertical ground reaction force (vGRF), limb
symmetry index at peak vGRF, loading rate, and total time needed to perform the
STS task were determined. RESULTS: Compared to the control participants, the FAI
patients exhibited worse Hip Disability and Osteoarthritis Outcome Score (HOOS)
pain and function subscores. No group differences were observed in peak sagittal
joint moments during the STS task. However, when compared to controls, the FAI
patients demonstrated reduced knee joint contributions to the TSM. In addition,
the FAI patients exhibited increased time needed to perform the STS task,
increased time to reach peak vGRF, and reduced lower extremity loading rate
during the STS task. CONCLUSIONS: FAI patients demonstrated abnormal joint
contributions to TSM and altered functional performance during the STS task.
These altered movement patterns during the STS task may be compensatory
mechanisms used by the FAI patients to reduce pain and to improve function. LEVEL
OF EVIDENCE: Not applicable.
CI - Copyright (c) 2017 American Academy of Physical Medicine and Rehabilitation.
Published by Elsevier Inc. All rights reserved.

Langue : ANGLAIS