Factors associated to functional outcome after total hip and knee arthroplasty

Abstract

Abstract Background An individual rehabilitation plan should guarantee a personalized approach to each patient. Identifying patients at risk of slower progression could help to implement a targeted approach. Aim of this study was to analyse patients characteristics associated to worse Functional Outcome (FO). Methods A cross sectional study of patients after Total Hip Arthoplasty (THA) or Total Knee Artroplasty (TKA) recovered in a Rehabilitation Clinic from January 2017 to December 2018 was performed. Patients characteristic: Age, Gender, Body Mass Index (BMI), Pain at admission (expressed in Numeric Pain Rating Scale: NRS), Cumulative Illness Rating Scale (CIRS) and Length of Stay in surgical facility (SLOS). Outcome tested: Active Flexion (AF), Barthel index (BI), Tinetti scale (TS), Pain at Discharge (PD). Patients were divided into two groups in relation to the achievement of target values in eight day of rehabilitation (AF = 84°, BI = 90, TS = 19 and PD ≥ 5). Statistical analysis was realized using Stata12. Results In total 1857 patients, 58% females, 56% after THA. Average age was 70.5±10.4, higher for females (72±9.7 vs. 68.3±11), average BMI 27.2±4.3, average SLOS 5.2±2.8. Regarding AF: 48% did not reach target value (38%THA; 55%TKA), for THA more likely older (OR 1.01) and females (OR 1.5) and for both THA and TKA higher NRS (OR 1.2). As for the BI target value was not reached by 24% patients (24.4%THA; 23.4%TKA); more likely older patients (OR 1.05), females (THA OR 2.1; TKA OR1.5), those with higher NRS (OR 1.13) and higher SLOS (THA OR 1.16; TKA OR 1.14). As for TS, 7% did not reached target (6.5%THA; 6.8%TKA), association with age (TKA OR 1.08; THA OR 1.04) and for THA also with SLOS (OR 1.13), pain (OR 1.16) and female sex (OR 2.16) was observed. As for the PD 17% not reached target (9.78%THA; 25.59%TKA), for TKA an association with BMI was observed (OR 1.08). Conclusions Worse FO was associated to not modifiable variables as age and gender but also with NRS, BMI and SLOS. Key messages Analysing patients characteristics associated to worse Functional Outcome allow to identify patients at risk of slower progression. The aim is to implement a targeted and personalized approach. The worse FO was associated to not modifiable variables as age and sex but also to higher NRS, prolonged SLOS and high BMI. Those conclusions help to manage an Individual Rehabilitation plan.