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Updated: Nov 22, 2025
Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty
Published on: February 27, 2018
The varus cemented femoral stem in total hip arthroplasty: Predictors, implications and The Femoral Access Ratio
G Sheridan1, H Hughes1, A Welch-Phillips1
1The National Orthopaedic Hospital, Cappagh, Dublin, Ireland.
Introduction:
We describe a novel morphological ratio, the Femoral Access Ratio, in the preoperative femur to investigate the predictors of femoral stem malalignment.
Methods:
We reviewed 70 cemented femoral stems. Preoperative 'FAR' score was measured. Postoperative coronal stem alignment was measured and ten year survivorship and functional outcomes investigated.
Results:
There were three predictors of varus stem malalignment-BMI, GT-height and 'FAR' score. Increasing BMI led to higher rates of malalignment (p = 0.048). 'FAR' score <1 lead to 68.4% of varus stems. GT height contributed most to the prediction of varus stem malalignment (p = 0.013).
Conclusion:
FAR score is a simple preoperative radiographic measurement that can predict the likelihood of femoral stem varus malalignment in cemented femoral stems.
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