Translation and validation of the 12-item Oxford knee score for use in Finland

Abstract

BackgroundThe focus in the reporting of results after total knee replacement (TKR) has changed from surgeon/radiologist-based scores to patient-reported outcome measures (PROMs). The questionnaires used in subjective outcome are often originally published in English and need to be validated in different languages. The aim of our study was to investigate the feasibility, validity, reliability, and responsiveness of the Finnish language version of the Oxford Knee Score (OKS-S) questionnaire.MethodsThe original OKS questionnaire was translated using a forward/backward protocol. The OKS-S questionnaire was sent to 225 patients who were scheduled to undergo TKR surgery. The assessment was repeated 1 year after the index operation. Half of the patients also received the RAND-36 questionnaire with the OKS-S questionnaire and the other half the Knee Injury and Osteoarthritis Outcome Score (KOOS) questionnaire. 30 patients twice received the OKS-S questionnaire preoperatively for the test-retest assessment.ResultsFeasibility was acceptable with a response rate of 96% in both pre- and postoperative assessments. Correlation between OKS-S questionnaire and all domains of the KOOS questionnaire and the physical domains in the RAND-36 questionnaire was high, and confirmed both good criterion and convergent validity. Content validity was good since no ceiling or floor effect was observed. In the test-retest assessment, all but 2 patients were within the 95% limits of agreement. Responsiveness was large according to effect sizes.ConclusionsOur data suggests that the OKS-S questionnaire is suitable for the assessment of both the preoperative status and the outcome of TKR in Finnish speaking patients.

Validation of the Spanish version of the Oxford knee score and assessment of its utility to characterize quality of life of patients suffering from knee osteoarthritis: a multicentric study

“…Discriminatory or known-groups validity seems adequate since the outcome score differs greatly in subjects with very different scores on the WOMAC or the EQ-5D-5 L scales. Additionally, it does not show significant ceiling or floor effects that compromise such discriminatory capacity, as has been previously pointed out in other adaptations [ 17 , 20 , 21 , 29 ].…”

“…Although the OKS has been adapted to Spanish for Spain, its psychometric properties have not been assessed in the Spanish population setting. As far as we know, only the Dutch and Finnish language adaptations of OKS have been validated in a prospective manner, similarly to the original work by Dawson et al [ 18 , 29 ], whereas its factor structure has not been confirmed in any of its adapted versions.…”

“…It is reported to be amongst the most sensitive, responsive, reliable, and valid patient-reported questionnaire for knee conditions [ 16 ]. It has been adapted and validated into Italian [ 17 ], Dutch [ 18 ], Chinese and Singapore English [ 19 ], German [ 20 ], French [ 21 ], Japanese [ 22 ], Portuguese [ 23 ], Korean [ 24 ], Persian [ 25 ], Greek [ 26 ], Spanish in Colombia [ 27 ], Arabic language [ 28 ], and Finnish language [ 29 ]. Owing to its good psychometric properties, it has been favorably compared to other widely used tools in different languages that are more difficult to administer [ 30 , 31 ].…”

Mapping analysis to predict EQ-5D-5 L utility values based on the Oxford Hip Score (OHS) and Oxford Knee Score (OKS) questionnaires in the Spanish population suffering from lower limb osteoarthritis

“…One aspect to be considered is the possibility of treating predictive variables as continuous or ordinal. Responses to OKS/OHS questionnaires are usually made using Likert scales [42,43,45,46]. Instruments that use Likert-type responses provide a categorical description of an underlying continuous variable.…”

Early Results of High Tibial Osteotomy for Osteoarthritis in Mongolia

“…The osteoarthritis in each knee was radiographically quantified using the Kellgren Lawrence classification 9 . Their knee range of motion was measured 17 . The mechanical axis was measured from standard weight-bearing alignment X-rays.…”