Publication date: Available online 10 November 2017
Source:Journal of Electromyography and Kinesiology
Author(s): Joseph Zeni, Kathleen Madara, Hunter Witmer, Riley Gerhardt, James Rubano
BackgroundFew studies have compared the biomechanical outcomes of different surgical approaches for hip arthroplasty. The purpose of this study was to compare hip, pelvic, and trunk kinematics and kinetics between individuals who underwent a posterior or anterolateral approach.MethodsForty-five individuals between 40 and 80 years old underwent motion analysis during overground gait prior to hip arthroplasty and 3 months after surgery. Walking speed, hip flexion angle, hip extension angle, adduction angle and moment, trunk angle, trunk lean, and pelvis drop were compared between approaches.FindingsThere were 30 subjects in the posterior group and 15 subjects in the anterolateral group. The groups did not change differently over time as there were no significant interaction effects. However, there were main effects for time; walking speed increased 19.9% (p<0.001), hip flexion angle increased 3.3 degrees (p=0.014) and peak hip extension increased 4.5 degrees (p=0.001), and peak hip adduction significantly increased 1.9 degrees (p=0.004) for the sample as a whole. Trunk angle (p=0.283) and trunk lean (p=0.401) did not significantly change between time points, but there was a significant increase in pelvic drop (p=0.003).InterpretationSurgical approach did not affect biomechanical outcomes 3 months after arthroplasty. Both groups showed improvement in sagittal plane hip kinetics and kinematics. However, increased pelvic drop may be indicative of residual hip weakness in both groups.
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