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. 2014 Apr;38(4):733-9.
doi: 10.1007/s00264-013-2157-1. Epub 2013 Oct 27.

Digital templating in total knee and hip replacement: an analysis of planning accuracy

Bettina Kniesel  1 , Lukas Konstantinidis, Anja Hirschmüller, Norbert Südkamp, Peter Helwig
Affiliations

Digital templating in total knee and hip replacement: an analysis of planning accuracy

Bettina Kniesel et al. Int Orthop. 2014 Apr.

Abstract

Purpose: The aim of this study was to determine how well pre-operative size selection for total knee and hip arthroplasties based on the digital imaging with and without additional referencing correlated with the size actually implanted.

Methods: Size selection planning of total knee arthroplasty by digital templating was documented in 46 cases with reference ball (group A) and in 48 cases without ball (group B). In addition, prospective analysis of pre-operative planning was conducted for 52 acetabular components with reference ball (group C) and 69 without ball (group D) as well as stem planning in 38 cases with ball (group E) and 54 cases without ball (group F). The data were analysed and compared with the size of the final component selected during surgery.

Results: The correlation between planned and implanted size for total knee arthroplasty in group A resulted in femoral anteroposterior (AP) r = 0.8622 and lateral r = 0.8333 and in group B AP r = 0.4552 and lateral r = 0.6950. Tibial in group A was AP r = 0.9030 and lateral r = 0.9074 and in group B AP r = 0.7000 and lateral r = 0.6376. For the acetabular components, the results in group C were r = 0.5998 and group D r = 0.6923. For stems, group E was r = 0.5306 and group F r = 0.5786. No correlation between BMI and the difference between planned and implanted size was found in any of the groups.

Conclusion: In the case of total hip arthroplasty there was a relatively low correlation between planned and implanted sizes with or without reference ball. For total knee arthroplasties the already high precision of size planning was further improved by the additional referencing with a reference ball.

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Figures

Fig. 1
Fig. 1
Digital templating of knee arthroplasty; anteroposterior (AP) view with reference ball on joint line
Fig. 2
Fig. 2
Digital templating of knee arthroplasty; lateral view with reference ball on joint line
Fig. 3
Fig. 3
Digital templating of a complex case of hip arthroplasty; hip overview without reference ball
See this image and copyright information in PMC

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