Journal
KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY
Volume 25, Issue 9, Pages 2736-2742Publisher
SPRINGER
DOI: 10.1007/s00167-015-3788-0
Keywords
Knee; Arthroplasty; Oxford; Score; Ceiling; Floor; Pain; Function; Subscale; OKS; Patient; Reported; Outcome
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Funding
- National Institute for Health Research [11/63/01] Funding Source: researchfish
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In this study, we examined whether the OKS demonstrated a floor or a ceiling effect when used to measure the outcome of knee replacement surgery in a large national cohort. NHS PROMs database, containing pre- to 6 month post-operative OKS on 72,154 patients, mean age 69 (SD 9.4), undergoing knee replacement surgery, was examined to establish the proportion of patients achieving top or bottom OKS values pre- and post-operatively. Pre-operatively, none of patients achieved the maximum/'best' (48) and minimum (0) scores. Post-operatively, no patients (0 %) achieved the minimum/'worst' score, but the percentage achieving the maximum score increased to 2.7 %. Subgroup analyses demonstrated that the highest post-operative overall ceiling percentage was 3 %, in a subgroup of patients between 60 and 79 years of age and 13.7 % in a group of patients who had a pre-operative OKS above 41. Furthermore, 10.8 % of patients achieved the top post-operative OKS-PCS and 4.7 % top post-operative OKS-FCS. Based on NHS PROMs data, the OKS does not exhibit a ceiling or floor effect overall, or for both its pain and function subscales, and remains a valid measure of outcomes for patients undergoing TKA. Large-scale retrospective observations study, Level II.
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