Validation of the Oxford Knee Score and Lower Extremity Functional Score questionnaires for use in Slovenia

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KNEE ARTHROPLASTY

Validation of the Oxford Knee Score and Lower Extremity Functional Score questionnaires for use in Slovenia Armin H. Paravlic1   · Sasa Pisot1 · Petar Mitic2 · Rado Pisot1 Received: 5 February 2020 / Accepted: 31 May 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020

Abstract Background  With the increasing prevalence of total knee replacement (TKR) due to knee osteoarthritis, the absence of patient-reported outcome measures in Slovenia must be addressed. Questions/purposes  (1) We cross-culturally adapted Oxford Knee Score (OKS) and Lower Extremity Functional Scale (LEFS) questionnaires to the Slovenian-speaking community. (2) We evaluated OKS and LEFS psychometric characteristics. Patients and methods  In the first assessment (Time 1) Slovenian versions of both questionnaires (OKS-Slo and LEFS-Slo), knee pain, timed-up to go (TUG) and sit to stand (STS) tests were completed by 123 subjects (55% females), of which 78 were patients scheduled for TKR and 45 were healthy age-matched controls. The questionnaires were assessed one week apart (Time 2) to investigate the test–retest reliability, with 121 subjects (98.4%) completing second measurements. Results  Significant differences were observed between the two groups. Where patients had greater body mass index, they were slower in TUG, weaker in STS, had greater knee pain in both knees and scored lower on both questionnaires. Additionally, correlation analysis showed that OKS-Slo and LEFS-Slo correlated almost perfectly (correlation coefficient [CC] = .968, p