Christopher C Cinnamon1, Jessica A Longworth1, J Heather Brunner2, Vivian K Chau3, Colleen A Ryan4, Kris R Dapiton3, Samuel J Chmell5, Kharma C Foucher6. 1. Department of Kinesiology and Nutrition, University of Illinois at Chicago, Chicago, IL, USA. 2. Department of Physical Therapy, University of Illinois at Chicago, Chicago, IL, USA. 3. Department of Kinesiology and Nutrition, University of Illinois at Chicago, Chicago, IL, USA; Department of Physical Therapy, University of Illinois at Chicago, Chicago, IL, USA. 4. Department of Kinesiology and Nutrition, University of Illinois at Chicago, Chicago, IL, USA; School of Nursing, DePaul University, Chicago, Illinois, Chicago, IL, USA. 5. Department of Orthopaedics, University of Illinois at Chicago, Chicago, IL, USA. 6. Department of Kinesiology and Nutrition, University of Illinois at Chicago, Chicago, IL, USA. Electronic address: kfouch1@uic.edu.
Abstract
BACKGROUND: A subset of total hip arthroplasty patients experience functional impairments past the first postoperative year. Poor hip abductor function is common before and in the early postoperative period. It is not known if abductor impairment is associated with long-term functional impairment. This study evaluated the relationships between static and dynamic abductor function and performance-based and self-reported function >1 year post-total hip arthroplasty. METHODS: Eighteen adults 1-5 years post-total hip arthroplasty participated. Static and dynamic abductor function were assessed through dynamometry and gait analysis, respectively. Subjects completed four physical performance tests and two self-report instruments. FINDINGS: Higher peak isometric abductor strength was associated with better performance-based function (P ≤ 0.001-0.030) and with self-reported function (P ≤ 0.001-0.012). Higher peak external adduction moment was associated with better results on 3 of 4 performance tests (P = 0.007-0.026). Together, static and dynamic abductor function predicted 35-77% of the variation in physical function. Abductor strength best predicted walking test results and self-reported function, while dynamic abductor function best predicted tests involving sit-to-stand INTERPRETATION: Static and dynamic abductor function were associated with physical function 1-5 years after total hip arthroplasty. These results support further investigation of interventions targeting abductor function for persons experiencing persistent impairments.
BACKGROUND: A subset of total hip arthroplastypatients experience functional impairments past the first postoperative year. Poor hip abductor function is common before and in the early postoperative period. It is not known if abductor impairment is associated with long-term functional impairment. This study evaluated the relationships between static and dynamic abductor function and performance-based and self-reported function >1 year post-total hip arthroplasty. METHODS: Eighteen adults 1-5 years post-total hip arthroplasty participated. Static and dynamic abductor function were assessed through dynamometry and gait analysis, respectively. Subjects completed four physical performance tests and two self-report instruments. FINDINGS: Higher peak isometric abductor strength was associated with better performance-based function (P ≤ 0.001-0.030) and with self-reported function (P ≤ 0.001-0.012). Higher peak external adduction moment was associated with better results on 3 of 4 performance tests (P = 0.007-0.026). Together, static and dynamic abductor function predicted 35-77% of the variation in physical function. Abductor strength best predicted walking test results and self-reported function, while dynamic abductor function best predicted tests involving sit-to-stand INTERPRETATION: Static and dynamic abductor function were associated with physical function 1-5 years after total hip arthroplasty. These results support further investigation of interventions targeting abductor function for persons experiencing persistent impairments.
Authors: Petros Ismailidis; Peter Kvarda; Werner Vach; Christian Appenzeller-Herzog; Annegret Mündermann Journal: BMJ Open Date: 2020-07-19 Impact factor: 2.692