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Which functional assessments predict long-term wear after total hip arthroplasty?
Ryan K Takenaga1, John J Callaghan, Nicholas A Bedard
1Department of Orthopaedics, University of Iowa Health Care, University of Iowa Hospitals and Clinics, 200 Hawkins Drive, 01029 JPP, Iowa City, IA 52242, USA.
Clinical Orthopaedics and Related Research
|April 10, 2013
Summary
Pedometer data, measuring daily steps, correlated with polyethylene wear in total hip arthroplasty (THA) patients. This functional assessment can help differentiate hip implant designs and surgical techniques long-term.
Area of Science:
- Orthopedic Surgery
- Biomaterials Science
- Clinical Biomechanics
Background:
- Limited long-term functional data exists for total hip arthroplasty (THA), especially in young, active patients.
- Functional outcomes are crucial for evaluating implant performance and surgical techniques in THA.
Purpose of the Study:
- To assess young THA patients at 10-year follow-up.
- To identify functional tests and patient-reported outcomes predicting long-term THA function.
- To determine if medical comorbidities affect functional test and outcome questionnaire performance.
Main Methods:
- Followed 50 patients (58 hips) aged ≤50 years at THA for ≥10 years.
- Utilized step activity monitors, 6-minute walk (6-MW) tests, and radiographic wear analysis (edge detection).
- Mean age at surgery: 39 years; mean BMI: 29 kg/m².
Main Results:
- Higher daily steps (pedometer data) correlated with increased linear and volumetric acetabular polyethylene wear.
- 6-MW, UCLA, and Tegner Lysholm scores did not correlate with acetabular wear.
- Comorbidities showed a non-significant detrimental effect on activity and outcome measures.
Conclusions:
- Pedometer data is the only functional measure that correlated with THA polyethylene wear.
- Incorporating pedometer data is recommended for long-term evaluation of THA designs and surgical techniques.
