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The minimal clinically important difference in the Oxford knee score and Short Form 12 score after total knee arthroplasty.
Knee Surg Sports Traumatol Arthrosc. 2014 Aug; 22(8):1933-9.KS

Abstract

PURPOSE

The aim of this study was to identify the minimal clinically important difference (MCID) in the Oxford knee score (OKS) and Short Form (SF-) 12 score after total knee arthroplasty (TKA).

METHODS

Prospective pre-operative and 1 year post-operative OKS and SF-12 scores for 505 patients undergoing a primary TKA for osteoarthritis were collected during a one-year period. Patient satisfaction with their (1) patient relief and (2) functional outcome was used as the anchor questions. Their response to each question was recorded using a 5-point Likert scale: excellent, very well, well, fair, and poor. Simple linear regression was used to calculate the MCID for improvement in the OKS and physical component of the SF-12 score according to the level of patient satisfaction with their pain relief and function.

RESULTS

The OKS improved by 15.5 (95 % CI 14.7-16.4) points and the SF-12 physical component score improved by 10.1 (95 % CI 9.1-11.2) points for the study cohort. The level of patient satisfaction with their pain relief and function correlated with the improvement in the OKS (r = 0.56; p < 0.001, and r = 0.56; p < 0.001) and the physical component of the SF-12 score (r = 0.51; p < 0.001, and r = 0.60; p < 0.001), respectively. The MCID for the OKS was 5.0 (95 % CI 4.4-5.5) and 4.3 (95 % CI 3.8-4.8) points and for the physical component of the SF-12, it was 4.5 (95 % CI 3.9-5.2) and 4.8 (95 % CI 4.2-5.4) points for pain relief and function, respectively.

CONCLUSION

The MCID identified for the OKS and SF-12 physical component score after TKA is the best available estimate and can be used to power studies and ensure that a statistical difference is also recognised by a patient.

Authors+Show Affiliations

Royal Infirmary of Edinburgh, Little France, Edinburgh, EH16 4SA, UK, nickclement@doctors.org.uk.No affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

24253376

Citation

Clement, N D., et al. "The Minimal Clinically Important Difference in the Oxford Knee Score and Short Form 12 Score After Total Knee Arthroplasty." Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA, vol. 22, no. 8, 2014, pp. 1933-9.
Clement ND, MacDonald D, Simpson AH. The minimal clinically important difference in the Oxford knee score and Short Form 12 score after total knee arthroplasty. Knee Surg Sports Traumatol Arthrosc. 2014;22(8):1933-9.
Clement, N. D., MacDonald, D., & Simpson, A. H. (2014). The minimal clinically important difference in the Oxford knee score and Short Form 12 score after total knee arthroplasty. Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA, 22(8), 1933-9. https://doi.org/10.1007/s00167-013-2776-5
Clement ND, MacDonald D, Simpson AH. The Minimal Clinically Important Difference in the Oxford Knee Score and Short Form 12 Score After Total Knee Arthroplasty. Knee Surg Sports Traumatol Arthrosc. 2014;22(8):1933-9. PubMed PMID: 24253376.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The minimal clinically important difference in the Oxford knee score and Short Form 12 score after total knee arthroplasty. AU - Clement,N D, AU - MacDonald,D, AU - Simpson,A H R W, Y1 - 2013/11/20/ PY - 2013/07/25/received PY - 2013/10/22/accepted PY - 2013/11/21/entrez PY - 2013/11/21/pubmed PY - 2014/12/15/medline SP - 1933 EP - 9 JF - Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA JO - Knee Surg Sports Traumatol Arthrosc VL - 22 IS - 8 N2 - PURPOSE: The aim of this study was to identify the minimal clinically important difference (MCID) in the Oxford knee score (OKS) and Short Form (SF-) 12 score after total knee arthroplasty (TKA). METHODS: Prospective pre-operative and 1 year post-operative OKS and SF-12 scores for 505 patients undergoing a primary TKA for osteoarthritis were collected during a one-year period. Patient satisfaction with their (1) patient relief and (2) functional outcome was used as the anchor questions. Their response to each question was recorded using a 5-point Likert scale: excellent, very well, well, fair, and poor. Simple linear regression was used to calculate the MCID for improvement in the OKS and physical component of the SF-12 score according to the level of patient satisfaction with their pain relief and function. RESULTS: The OKS improved by 15.5 (95 % CI 14.7-16.4) points and the SF-12 physical component score improved by 10.1 (95 % CI 9.1-11.2) points for the study cohort. The level of patient satisfaction with their pain relief and function correlated with the improvement in the OKS (r = 0.56; p < 0.001, and r = 0.56; p < 0.001) and the physical component of the SF-12 score (r = 0.51; p < 0.001, and r = 0.60; p < 0.001), respectively. The MCID for the OKS was 5.0 (95 % CI 4.4-5.5) and 4.3 (95 % CI 3.8-4.8) points and for the physical component of the SF-12, it was 4.5 (95 % CI 3.9-5.2) and 4.8 (95 % CI 4.2-5.4) points for pain relief and function, respectively. CONCLUSION: The MCID identified for the OKS and SF-12 physical component score after TKA is the best available estimate and can be used to power studies and ensure that a statistical difference is also recognised by a patient. SN - 1433-7347 UR - https://www.unboundmedicine.com/medline/citation/24253376/The_minimal_clinically_important_difference_in_the_Oxford_knee_score_and_Short_Form_12_score_after_total_knee_arthroplasty_ L2 - https://dx.doi.org/10.1007/s00167-013-2776-5 DB - PRIME DP - Unbound Medicine ER -