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Utility of anthropometric measures in determining implant size in total knee arthroplasty

Ogyaadu Adjei Joseph, Duah Henry Ofori, Yirerong Theresa and Blankson Benjamin

Background: Templating in Total Knee Arthroplasty (TKA) is an integral part of pre-op planning allowing surgeons to estimate the probable size and position of an implant prior to surgery. In order to provide an easier approach to accurately estimate the size of femoral component without the use of digital and analogue techniques, the study sought to predict component size using body anthropometric parameters.

Methods and Findings: We retrospectively reviewed 40 patients who had TKA but included only 24 female patients in the final analysis due to incomplete data in some cases. Preliminary analysis was done to explore the relationship between femoral component size and patients' age, height, Weight and BMI and found that only height significantly correlated with femoral component size. A simple linear regression model was generated with height as the predictor variable. This predictive model was later applied to a different consecutive series for validation. The model exactly predicted component size in only 30.4% of cases whiles 65.2% of model predictions were within 1 size unit of the actual components implanted. In addition, 100% of the model predictions were within 2 size units of the actual femoral components implanted.

Conclusion: Although our model was less accurate compared to other reported models for TKA, it remains among the very few to be conducted in a West African setting and will serve as a basis for further research of TKA Templating in the region.