Increasing comorbidity is associated with worsening physical function and pain after primary total knee arthroplasty

BMC Musculoskeletal Disorders

Research Article

Terence Gioe¹  Siamak Noorbaloochi²  Jasvinder A. Singh³  Maren E. Hilton⁴ 

[1] Department of Orthopedic Surgery, VA Medical Center, Minneapolis, MN, USA;Division of General Internal Medicine, VA Medical Center, Minneapolis, MN, USA;Medicine Service, VA Medical Center, Birmingham, AL, USA;Department of Medicine at the School of Medicine, and Division of Epidemiology at the School of Public Health, University of Alabama at Birmingham, Faculty Office Tower 805B, 510 20th Street S, 35294, Birmingham, AL, USA;Department of Orthopedic Surgery, Mayo Clinic College of Medicine, Rochester, MN, USA;Rheumatology Section, Medicine Service and Division of Rheumatology, Department of Medicine, University of Minnesota, Minneapolis, MN, USA;Present address: Arthritis and Rheumatology Consultants, 7250 France Ave #215, 55435, Edina, MN, USA;

关键词: Comorbidity;    Physical Function;    Pain;    Primary Total Knee Arthroplasty;    TKA;    Worsening;   

DOI  :  10.1186/s12891-016-1261-y

 received in 2015-09-03, accepted in 2016-09-23,  发布年份 2016

来源: Springer

【 摘 要 】

BackgroundPrevious studies suggested that pre-operative comorbidity was a risk factor for worse outcomes after TKA. To our knowledge, studies have not examined whether postoperative changes in comorbidity impact pain and function outcomes longitudinally. Our objective was to examine if increasing comorbidity postoperatively is associated with worsening physical function and pain after primary total knee arthroplasty (TKA).MethodsWe performed a retrospective chart review of veterans who had completed Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) and Short Form-36 (SF36) surveys at regular intervals after primary TKA. Comorbidity was assessed using a variety of scales: validated Charlson comorbidity index score, and a novel Arthroplasty Comorbidity Severity Index score (Including medical index, local musculoskeletal index [including lower extremity and spine] and TKA-related index subscales; higher scores are worse ), at multiple time-points post-TKA. We used mixed model linear regression to examine the association of worsening comorbidity post-TKA with change in WOMAC and SF-36 scores in the subsequent follow-up periods, controlling for age, length of follow-up, and repeated observations.ResultsThe study cohort consisted of 124 patients with a mean age of 71.7 years (range 58.6–89.2, standard deviation (SD) 6.9) followed for a mean of 4.9 years post-operatively (range 1.3–11.4; SD 2.8). We found that post-operative worsening of the Charlson Index score was significantly associated with worsening SF-36 Physical Function (PF) (beta coefficient (ß) = -0.07; p < 0.0001), SF-36 Bodily Pain (BP) (ß = -0.06; p = 0.002), and WOMAC PF subscale (ß = 0.08; p < 0.001; higher scores are worse) scores, in the subsequent periods. Worsening novel medical index subscale scores were significantly associated with worsening SF-36 PF scores (ß = -0.03; p = 0.002), SF-36 BP (ß = -0.04; p < 0.001) and showed a non-significant trend for worse WOMAC PF scores (ß = 0.02; p = 0.11) subsequently. Local musculoskeletal index subscale scores were significantly associated with worsening SF-36 PF (ß = -0.05; p = 0.001), SF-36 BP (ß = -0.04; p = 0.03) and WOMAC PF (ß = 0.06; p = 0.01) subsequently. None of the novel index subscale scores were significantly associated with WOMAC pain scores. TKA complications, as assessed by TKA-related index subscale,  were not significantly associated with SF-36 or WOMAC domain scores.ConclusionsIncreasing Charlson index as well as novel medical and local musculoskeletal index subscale scores (from novel Arthroplasty  Comorbidity Severity Index) post-TKA correlated with subsequent worsening of physical function and pain outcomes post-TKA. Further studies should examine which comorbidity management could have the greatest impact on these outcomes.

【 授权许可】

CC BY   
© The Author(s). 2016