Abstract
BackgroundThe effect of change in hip anatomy on change in gait pattern is not well described in current literature. Therefore, our primary aim was to describe and quantify changes in hip geometry and gait pattern 1 year after total hip arthroplasty (THA) in individuals with hip osteoarthritis. Our secondary aim was to explore the effect of postoperative change in femoral neck anteversion (FNA) and femoral offset and acetabular offset (FO/AO) quota on postoperative change in hip rotation and hip adduction moment during gait, respectively, 1 year after THA”.MethodsSixty-five individuals with primary hip osteoarthritis, scheduled for THA, were analyzed in this prospective intervention study. Participants were evaluated pre- and 1 year postoperatively with computed tomography-scans, three-dimensional gait analysis, and patient-reported outcome measures. Multiple linear regressions were performed to evaluate the association between change in joint anatomy and change in gait pattern after THA.ResultsOne year postoperatively, global offset was symmetrical between sides as a result of decreased acetabular offset and increased femoral offset on the operated side. Quality of overall gait pattern improved, and participants walked faster and with less trunk lean over the affected side. FNA and hip rotations during walking changed equally in external and internal directions after THA and change in hip rotation during walking was associated with change in FNA in the same direction. An increase in external hip adduction moments was, on the other hand, not associated with change in FO/AO quota but with a more upright walking position and increased walking speed.ConclusionsThe findings of this study suggest that geometrical restoration during THA impacts postoperative gait pattern and, in addition to known factors such as FO, height of hip rotation center, and leg length discrepancy, the FNA must also be taken into consideration.Trial registrationTrial registration: Clinicaltrial.gov, NCT01512550, Registered 19 January 2012 - Retrospectively registered.
Highlights
The effect of change in hip anatomy on change in gait pattern is not well described in current literature
Changes in hip joint anatomy 1 year after total hip arthroplasty (THA) Compared to preoperative values, femoral neck anteversion (FNA) angles changed in internal and external directions leading to a statistically non-significant change on group level (Fig. 2)
Compared to the contralateral side, femoral offset (FO) had increased, and acetabular offset (AO) had decreased on the operated side while symmetry between sides were noted in FNA and global offset (GO) (Table 2)
Summary
The effect of change in hip anatomy on change in gait pattern is not well described in current literature. Our primary aim was to describe and quantify changes in hip geometry and gait pattern 1 year after total hip arthroplasty (THA) in individuals with hip osteoarthritis. Our secondary aim was to explore the effect of postoperative change in femoral neck anteversion (FNA) and femoral offset and acetabular offset (FO/AO) quota on postoperative change in hip rotation and hip adduction moment during gait, respectively, 1 year after THA”. Symptoms are often eliminated or significantly reduced by total hip arthroplasty (THA) in which the joint is replaced with a prosthetic stem and cup. Most studies have focused on the FO in relation to gait and function Both the FO and AO are important to consider when restoring hip joint anatomy. Unlike FO, the AO/FO quota is a relative measure and independent of the size of the pelvis
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
