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Body mass index changes after unicompartmental knee arthroplasty do not adversely influence patient outcomes.
Knee Surg Sports Traumatol Arthrosc. 2018 Jun; 26(6):1691-1697.KS

Abstract

PURPOSE

The objective of this study is to evaluate the prevalence of patients who lost or gained weight following unicompartmental knee arthroplasty (UKA), the effect of post-operative body mass index (BMI) changes on functional outcomes and quality of life (QoL), and predictive factors associated with BMI changes.

METHODS

Prospectively collected data of 1043 patients who underwent UKA between 2000 and 2014 were reviewed. BMI, Knee Society Knee Score and Function Score, Oxford Knee Score (OKS), Short-Form 36 (SF-36) Physical Component Score (PCS) and Mental Component Score and proportion of patients attaining OKS/SF-36 minimal clinically important differences (MCID) were recorded preoperatively and at 2 years post-operatively. The patients were stratified into three groups based on weight changes for further analysis.

RESULTS

Following UKA, 138 (13.3%) patients had lost weight, 695 (66.6%) maintained their weight, and 210 (20.1%) gained weight. Patients in all groups demonstrated significant improvements in functional and SF-36 PCS scores at 2 years post-operatively. There were no significant differences in functional outcomes, QoL or revision rate between the groups. Post-operative BMI changes were not correlated with any outcome scores or attainment of MCID (n.s.).

CONCLUSIONS

This is the first study that evaluates change in BMI following UKA. It demonstrated a higher proportion of patients who gained weight as compared to those who lost weight. Post-operative BMI changes did not appear to affect outcomes of UKA. These findings will provide important information to surgeons when counselling patients regarding BMI change and its effect on outcomes after UKA.

LEVELS OF EVIDENCE

Level III.

Authors+Show Affiliations

Department of Orthopaedic Surgery, Singapore General Hospital, Outram Road, Singapore, 169608, Singapore. williamxia0402@gmail.com.Department of Orthopaedic Surgery, Singapore General Hospital, Outram Road, Singapore, 169608, Singapore.Department of Orthopaedic Surgery, Singapore General Hospital, Outram Road, Singapore, 169608, Singapore.Department of Orthopaedic Surgery, Singapore General Hospital, Outram Road, Singapore, 169608, Singapore.Department of Orthopaedic Surgery, Singapore General Hospital, Outram Road, Singapore, 169608, Singapore.Department of Orthopaedic Surgery, Singapore General Hospital, Outram Road, Singapore, 169608, Singapore.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

28879594

Citation

Xia, Zhan, et al. "Body Mass Index Changes After Unicompartmental Knee Arthroplasty Do Not Adversely Influence Patient Outcomes." Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA, vol. 26, no. 6, 2018, pp. 1691-1697.
Xia Z, Liow MHL, Goh GS, et al. Body mass index changes after unicompartmental knee arthroplasty do not adversely influence patient outcomes. Knee Surg Sports Traumatol Arthrosc. 2018;26(6):1691-1697.
Xia, Z., Liow, M. H. L., Goh, G. S., Chong, H. C., Lo, N. N., & Yeo, S. J. (2018). Body mass index changes after unicompartmental knee arthroplasty do not adversely influence patient outcomes. Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA, 26(6), 1691-1697. https://doi.org/10.1007/s00167-017-4703-7
Xia Z, et al. Body Mass Index Changes After Unicompartmental Knee Arthroplasty Do Not Adversely Influence Patient Outcomes. Knee Surg Sports Traumatol Arthrosc. 2018;26(6):1691-1697. PubMed PMID: 28879594.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Body mass index changes after unicompartmental knee arthroplasty do not adversely influence patient outcomes. AU - Xia,Zhan, AU - Liow,Ming Han Lincoln, AU - Goh,Graham Seow-Hng, AU - Chong,Hwei Chi, AU - Lo,Ngai Nung, AU - Yeo,Seng Jin, Y1 - 2017/09/06/ PY - 2017/03/16/received PY - 2017/08/30/accepted PY - 2017/9/8/pubmed PY - 2018/9/27/medline PY - 2017/9/8/entrez KW - Body mass index KW - Functional outcomes KW - Quality of life KW - Unicompartmental knee arthroplasty SP - 1691 EP - 1697 JF - Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA JO - Knee Surg Sports Traumatol Arthrosc VL - 26 IS - 6 N2 - PURPOSE: The objective of this study is to evaluate the prevalence of patients who lost or gained weight following unicompartmental knee arthroplasty (UKA), the effect of post-operative body mass index (BMI) changes on functional outcomes and quality of life (QoL), and predictive factors associated with BMI changes. METHODS: Prospectively collected data of 1043 patients who underwent UKA between 2000 and 2014 were reviewed. BMI, Knee Society Knee Score and Function Score, Oxford Knee Score (OKS), Short-Form 36 (SF-36) Physical Component Score (PCS) and Mental Component Score and proportion of patients attaining OKS/SF-36 minimal clinically important differences (MCID) were recorded preoperatively and at 2 years post-operatively. The patients were stratified into three groups based on weight changes for further analysis. RESULTS: Following UKA, 138 (13.3%) patients had lost weight, 695 (66.6%) maintained their weight, and 210 (20.1%) gained weight. Patients in all groups demonstrated significant improvements in functional and SF-36 PCS scores at 2 years post-operatively. There were no significant differences in functional outcomes, QoL or revision rate between the groups. Post-operative BMI changes were not correlated with any outcome scores or attainment of MCID (n.s.). CONCLUSIONS: This is the first study that evaluates change in BMI following UKA. It demonstrated a higher proportion of patients who gained weight as compared to those who lost weight. Post-operative BMI changes did not appear to affect outcomes of UKA. These findings will provide important information to surgeons when counselling patients regarding BMI change and its effect on outcomes after UKA. LEVELS OF EVIDENCE: Level III. SN - 1433-7347 UR - https://www.unboundmedicine.com/medline/citation/28879594/Body_mass_index_changes_after_unicompartmental_knee_arthroplasty_do_not_adversely_influence_patient_outcomes_ L2 - https://dx.doi.org/10.1007/s00167-017-4703-7 DB - PRIME DP - Unbound Medicine ER -