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The Journal of Hip Surgery 2021; 05(02): 078-083
DOI: 10.1055/s-0041-1729867
Original Article

The Accuracy and Ability of Preoperative Templating to Restore Femoral Offset in Calcar-Guided Short-Stem Total Hip Prosthesis through Direct Anterior Approach

Barbara Favier 
1   Department of Orthopedic Surgery, AZ St. Elisabeth Hospital, Herentals, Belgium
,
Nathalie van Beek
1   Department of Orthopedic Surgery, AZ St. Elisabeth Hospital, Herentals, Belgium
,
Mike Tengrootenhuysen
1   Department of Orthopedic Surgery, AZ St. Elisabeth Hospital, Herentals, Belgium
› Author Affiliations Source of Funding No funding.
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Abstract

The aim of this study was to assess the applicability and ability of preoperative templating to restore femoral offset and hip length with a calcar-guided short-stem implant design in total hip arthroplasty through the direct anterior approach. Preoperative measurements were performed of femoral offset, hip length, and stem size and compared with the perioperative placed prosthesis in 100 patients undergoing primary total hip replacement through direct anterior approach. Additionally, the pre- and postoperative femoral offset and hip length were compared to evaluate the ability to restore the offset and hip length with this kind of femoral short stem. With an acceptance of 1 size difference pre- and postoperatively, a 94% accuracy of predicting the size of the calcar-guided short stem was achieved with templating. Femoral offset was within means of 5 mm in 82.2% of the patients. Postoperative hip length was within 6 mm in 90% of the patients compared with the preoperative length.

The use of preoperative templating for total hip arthroplasty with calcar-guided short-stem implants was proven to be a useful tool to predict the definite implanted size of the femoral prosthesis. Our results show that this new stem design does not significantly differ from previous reported outcomes with other stem designs and is competent to restore the femoral offset and hip length within clinical acceptable range.

Level of evidence Level 3 retrospective case study.

Keywords

total hip arthroplasty - templating - direct anterior approach - hip offset - hip length

Ethics

This study was conducted in accordance with the 2013 version of the Declaration of Helsinki. The study protocol was approved by AZ Herentals Commission (Ethische Commissie OG 150 zitting 14.05.2018).




Publication History

Received: 20 June 2020

Accepted: 12 October 2020

Article published online:
09 June 2021

© 2021. Thieme. All rights reserved.

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