Measurement properties of New Mobility Score to evaluate functional recovery in the elderly following total hip arthroplasty

Abstract

Introduction/Objective. The aim of this study is to identify and evaluate the use of New Mobility Score (NMS) in estimating functional recovery three months after total hip arthroplasty (THA). Methods. In total, 70 patients, aged > 60 years, underwent THA. Treatment group was subjected to the comprehensive rehabilitation program and control group to the standard one. Primary outcome was assessed with Harris Hip Score (HHS) and NMS, and secondary one by Medical Outcomes Health Survey (Short-Form Health Survey – SF-36). Questionnaires were collected before and three months after hip surgery. Results. Treatment group showed significant improvement three months postoperatively. The correlation in both groups between HHS and NMS was very strong (r > 0.700). Treatment group following surgery showed strong correlation between Recovery through Personal Care Services (PCS) and HHS and NMS (r > 0.700), moderate to strong between pain categories and HHS (r = 0.380; r = 0.583) and NMS (r = 0.424). Control group showed strong correlation between PCS and HHS (r = 0.704), and NMS (r = 0.568) and moderate to pain categories and HHS (r = 0.546; r = 0.466). The area under the curve (AUC) described the inherent validity of all measurement used AUCNMS = 0.724, p = 0.001, AUCHHS = 0.788, p = 0.000 and AUCPCS = 0.747, p = 0.001. Conclusion. The NMS could be successfully used in routine clinical assessment of elderly patients following THA. The trial is registered in ISRCTN Register with https://doi.org/10.1186/ISRCTN73197506.

Keywords

• harris hip score
• new mobility score
• sf-36
• outcome assessment
• hip arthroplasty
• rehabilitation
• roc curve