Femoral Head Size is Correlated With Head Position in Very Elderly Patients

Tim A.E.J. Boymans*, Hidde D. Veldman, Bernd P. Grimm, Philip C. Noble, Ide C. Heyligers

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

2 Citations (Scopus)


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 <80 years. For each age and gender subgroup one specific (LT-FHC)/FHD ratio was determined. The accuracy of the new determined ratios and the established ratios by others were compared by recalculating the LT-FHC distance of each individual subject. 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.

Original languageEnglish
Pages (from-to)587-593
Number of pages7
JournalJournal of Arthroplasty
Issue number2
Publication statusPublished - 1 Feb 2017
Externally publishedYes


  • femoral head position
  • femoral head size
  • femoral neck fracture
  • hip arthroplasty
  • lesser trochanter
  • very elderly


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