Proximal Femur Size and Geometry in Cementless Total Hip Arthroplasty Patients

Accurate femoral prosthesis press-fit is essential for successful Introduction: cementless total hip arthroplasty (cTHA) and dependent upon proximal femur size and geometry. Study objectives were to determine the variability of proximal femur size and geometry in primary cTHA patients and correlate them with patient demographics and body mass index (BMI). Medical records of 127 consecutive primary cTHA patients were Methods: reviewed retrospectively. The demographic (ethnicity, sex, age) and BMI data were collected. Intertrochanteric (IT) distance, inner/outer proximal femur diameters and cortical thickness for the subtrochanteric (ST) and cortical diaphyseal (DP) regions were measured from anteroposterior radiographs. Descriptive statistics were used to correlate patient demographics and BMI with radiographic measurements. The study included 96 cTHA patients (mean age 60 years, range Results: 22-91 years; 34 females; 72 Caucasian, 18 Black, and six Hispanic) with four underweight; 13 normal; 34 overweight, and 45 obese BMI. No correlation existed for patient age or race with radiographic measurements. Males had significantly larger proximal femur dimensions and cortical thickness than females. No BMI correlations existed for IT distance; BMI was directly proportional to outer diameter and cortical thickness in ST and DP regions, and inversely proportional to inner diameter in these regions. Greater proximal femur size appears to correlate with gender, but Discussion: not with age or race. Larger subtrochanteric and diaphyseal outer diameters are significantly associated with higher BMI. A trend exists for larger subtrochanteric and diaphyseal inner diameters to be associated with lower BMI. These findings may have implications for optimal cTHA femoral component design. Zbigniew Gugala ( ) Corresponding author: [email protected] Moulton DL, Lindsey RW and Gugala Z. How to cite this article: Proximal Femur Size and Geometry in Cementless Total Hip Arthroplasty 2015, :161 (doi: ) Patients [version 1; referees: 1 approved, 1 approved with reservations] F1000Research 4 10.12688/f1000research.6554.1 © 2015 Moulton DL . This is an open access article distributed under the terms of the , Copyright: et al Creative Commons Attribution Licence which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Data associated with the article are available under the terms of the (CC0 1.0 Public domain dedication). Creative Commons Zero "No rights reserved" data waiver The author(s) declared that no grants were involved in supporting this work. Grant information: Competing interests: The authors declared no competing interests. 23 Jun 2015, :161 (doi: ) First published: 4 10.12688/f1000research.6554.1 Referee Status: