Abstract
Background: In cases of femoral neck fracture, it is often not possible to accurately determine the original position of the head center to assess appropriate restoration of leg length. The aim of this study was to determine the accuracy of predicting the position of the femoral head center based on new and established correlations between the femoral head diameter (FHD) and the distance between the lesser trochanter and the femoral head center (LT-FHC) in the very elderly (aged >= 80 years) as the mainly affected but yet underinvestigated group.
Methods: The FHD and the LT-FHC distance were determined in 148 subjects (104 males, 44 females); 90 aged >= 80 years and 58 aged
Results: The FHD and the LT-FHC were significantly correlated, most strongly in elderly females (R = 0.554, P <.001). Using the new age-and gender-specific ratios, the LT-FHC distance could be predicted within 10 mm of the true value in 95% of the cases and in only 77% using previously reported formulas.
Conclusion: Age-and gender-specific formulas yield higher accuracy than generic formulas. The formulas presented in this study can offer a practical, easy to use instrument for orthopedic surgeons performing hip arthroplasty in very elderly patients in addition to classic techniques to prevent significant leg-length discrepancy. (C) 2016 Elsevier Inc. All rights reserved.
Original language | English |
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Pages (from-to) | 587-593 |
Number of pages | 7 |
Journal | Journal of Arthroplasty |
Volume | 32 |
Issue number | 2 |
DOIs | |
Publication status | Published - Feb 2017 |
Keywords
- femoral head size
- femoral head position
- lesser trochanter
- femoral neck fracture
- hip arthroplasty
- very elderly
- TOTAL HIP-ARTHROPLASTY
- LEG-LENGTH INEQUALITY
- VOLUMETRIC MEASUREMENTS
- LESSER TROCHANTER
- PROXIMAL FEMUR
- DISCREPANCY
- ROTATION
- RADIOGRAPHS
- PARAMETERS
- MORPHOLOGY