Measuring leg length and offset with an imageless navigation system during total hip arthroplasty: is it really accurate?
✍ Scribed by Tobias Renkawitz; Tibor Schuster; Thomas Herold; Holger Goessmann; Ernst Sendtner; Joachim Grifka; Thomas Kalteis
- Book ID
- 104583264
- Publisher
- Wiley (Robotic Publications)
- Year
- 2009
- Tongue
- English
- Weight
- 371 KB
- Volume
- 5
- Category
- Article
- ISSN
- 1478-5951
- DOI
- 10.1002/rcs.250
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
Background
A novel imageless measurement algorithm to assess leg length (LL) and offset (OS) changes during total hip arthroplasty (THA) has been established, the purpose of this study was to describe the process and establish whether or not it is accurate.
Methods
THA was performed on 17 cadaver hip specimens. LL and OS changes were determined intra‐operatively, using an imageless navigation system. Pre‐ and postoperatively, all specimens had a computed tomography scan (CT) and the LL and OS changes were analysed by two blinded investigators.
Results
With mean differences of less than 1 mm (LL, 0.74; SD, 2.4 mm; OS, 0.89; SD, 1.8 mm) supported by substantial significant correlations [r = 0.83 (LL) and r = 0.92 (OS)] imageless navigation values demonstrated a high accuracy when compared to CT measurements.
Conclusions
Intra‐operative LL and OS measures are reliable and accurate when using an imageless calculation algorithm which stores the position of the femoral reference frame in relation to the pelvic coordinate system before and after reconstruction. Copyright © 2009 John Wiley & Sons, Ltd.