Changes in Femoral Version During Implantation of Anatomic Stems: Implications on Stem Design

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• 作者：Ahmad Faizan ; PhD^a ; ; Justin J. Gerges ; BS^a ; Gerard Asencio ; MD^b ; Jerome Essig ; MD^c ; Edouard Munini ; MD^b ; William J. Hozack ; MD^d
• 关键词：anatomic stem ; CT data ; femoral anteversion ; cadaver study ; navigation ; SOMA
• 刊名：The Journal of Arthroplasty
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：31
• 期：2
• 页码：512-516
• 全文大小：700 K

文摘

Component positioning in total hip arthroplasty (THA) is among the primary indicators for longevity and success. Acetabular component positioning has been discussed in literature at length; however, femoral component positioning is also important as it contributes to combined anteversion.

Methods

In this study, we examined the changes in femoral anteversion after the implantation of anatomic stem ABG II. A cadaveric study, a computed tomography–based computer modeling study, and a clinical study using a navigation system were conducted to document these changes.

Results

These studies demonstrated that the anatomic stem ABG II increased the postimplantation femoral version by approximately 7°. The postimplantation versions followed a bimodal distribution. The computed tomography and navigation data also highlighted that the patient population may roughly be divided into 2 groups: the first group that needs anteverted stem and the second group that needs little or no anteversion in the stem to recreate the desired version and offset.

Conclusion

Based upon our data, we propose a new anatomic stem design that is offered in 2 version angles of 0° and 7° to help create the desired version and offset.