Foot size as a predictor of intramedullary nail size in humerus and long bone shaft fractures - 13/12/24
, Brahim Demnati 3, Tariq Aalil 1, El Khir Yassine Fath 1, El Mehdi Boumediane 1, Mohamed Amine Benhima 1, 2, Imad Abkari 1, 2Abstract |
Intramedullary nailing is a common and effective treatment for long bone fractures. However, choosing the correct nail length is crucial to avoid complications. This study aimed to investigate if self-reported foot size could predict intramedullary nail length for long bone fractures, particularly for the humerus.
A cohort study of 205 patients with femur, tibia, or humerus fractures was conducted. Participants self-reported their foot size using the European shoe size scale. Linear regression analysis was used to evaluate the correlation between foot size and nail length, and to develop a prediction model. The accuracy of the model was assessed using the coefficient of determination (R2) and the standard error of the estimate (SEE).
For humerus fractures, foot size was found to be proportional to nail length, but with a lower coefficient of determination (R\u00b2=0.85) compared to the femur and tibia. The regression equation for predicting humerus nail length was: y=0.57x+0.8 where y is the humerus nail length in centimeters and x is the foot size in EU. The standard error of the estimate (SEE) for this model was 1.14cm. Simplified equations were derived for the 3 bone types: Humerus: Nail length (cm)=Foot size (EU)×0.6±1, Femur: Nail length (cm)=Foot size (EU)±2 and Tibia: Nail length (cm)=Foot size (EU)−4±2.
The study found that self-reported foot size could be a useful predictor of intramedullary nail length for long bone fractures, including humerus fractures. However, the prediction for humerus nail length was less accurate than for femur and tibia nail lengths. This could be due to the smaller sample size of patients with humerus fractures (n=42) compared to femur (n=75) and tibia (n=88) fractures.
Self-reported foot size shows promise as a simple and accessible predictor of intramedullary nail length for humerus fractures, although with lower accuracy compared to femur and tibia fractures. Further research with a larger sample size is needed to validate these findings and improve the prediction model for humerus fractures.
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Vol 43 - N° 6
Article 101931- décembre 2024 Retour au numéro
Article précédent
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