IJOCP | Volume – 2015| Issue – 2015| Article ID – 2015:100
Conference: Indian Orthopaedic Association Annual Conference IOACON-2013,      India [Click for Full details]  

Authors: Goyal A, Geller J

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Address of correspondence: doc_amrit@yahoo.com  


Abstract                                                                                                                 

Introduction: The purpose of this study was to investigate factors affecting the short term outcome of metal-on-metal hip resurfacing (MOMHR) and develop a multivariate regression model that can predict outcome.

Methods: This was a prospective study of 154 patients who underwent MOMHR and were followed for a minimum of 1 year. Fourteen independent variables (age, gender, diagnosis, co-morbidities, BMI, pre-op WOMAC Physical Component (PC)/Stiffness (S)/Pain (P), SF-12 physical (SP), SF-12 mental (SM), acetabular and femoral component sizes, operative time, and EBL) were analyzed using correlation and multivariate regression analyses. Multivariate regression models were validated using an independent cohort.

Results: Correlation analyses showed four variables significantly influence short term MOMHR outcome. These include comorbidities (C, p=0.0001), pre-op SF-12 mental (SM, p=0.0004), BMI (p=0.0006) and gender (G, p=0.0454). By multivariate regression analysis, the following regression model was obtained with an R2 value of 0.3816: Outcome = G*4.72 – BMI*0.70 – C*0.11 + SM*0.31 + 87.44. The average predicted outcome using this equation did not differ significantly from the observed WOMAC Physical function outcome at a minimum of one year postoperatively.

Conclusion: To our knowledge, this study is the first reported multivariate analysis of factors affecting MOMHR and confirms the correlation of some of the previously proposed factors such as gender, BMI, comorbidities and preoperative function. The multivariate regression equation can be used to predict the short term outcome of MOMHR.

How to Cite this Abstract
Goyal A, Geller J. Predicting short-term outcome of metal-on-metal hip resurfacing. International Journal of Conference Proceedings 2015;(2015):100