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Abnormal Joint Moment Distributions and Functional Performance During Sit‐to‐Stand in Femoroacetabular Impingement Patients
Author(s) -
Samaan Michael A.,
Schwaiger Benedikt J.,
Gallo Matthew C.,
Link Thomas M.,
Zhang Alan L.,
Majumdar Sharmila,
Souza Richard B.
Publication year - 2017
Publication title -
pmandr
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.617
H-Index - 66
eISSN - 1934-1563
pISSN - 1934-1482
DOI - 10.1016/j.pmrj.2016.10.002
Subject(s) - femoroacetabular impingement , sagittal plane , medicine , biomechanics , physical therapy , physical medicine and rehabilitation , osteoarthritis , orthopedic surgery , range of motion , surgery , anatomy , alternative medicine , pathology
Background 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. Objective 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.