Premium
Comparison of navigation accuracy in THA between the mini‐anterior and ‐posterior approaches
Author(s) -
Hananouchi Takehito,
Takao Masaki,
Nishii Takashi,
Miki Hidenobu,
Iwana Daiki,
Yoshikawa Hideki,
Sugano Nobuhiko
Publication year - 2009
Publication title -
the international journal of medical robotics and computer assisted surgery
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.556
H-Index - 53
eISSN - 1478-596X
pISSN - 1478-5951
DOI - 10.1002/rcs.226
Subject(s) - total hip arthroplasty , medicine , computer assisted surgery , computed tomography , navigation system , orientation (vector space) , significant difference , computer science , implant , nuclear medicine , orthodontics , surgery , computer vision , mathematics , geometry
Abstract Background The accuracy of a CT‐based hip navigation might depend on surgical approaches, resulting in varying accuracy of implant alignment. Methods We performed primary cementless total hip arthroplasty (THA) with mini‐incision surgery (MIS) to 40 well‐matched patients (anterior or posterior approaches, 20 hips each), using navigation with surface registration. We investigated cup alignment using postoperative computed tomography (CT) and compared the navigation accuracy between the two approaches, i.e. the difference between intra‐operative and postoperative alignments of the cup. Results There was no significant difference between the two approaches. The mean navigation accuracies in abduction and anteversion were 2.0° (SD 1.4° ) and 2.7° (SD 1.9° ), respectively, in the anterior approach, and 2.4° (SD 2.0° ) and 2.0° (SD 1.4° ), respectively, in the posterior approach. All cup alignments were within 10° of the target orientation. Conclusions This CT‐based navigation for MIS–THA provides navigation accuracy without significant differences between the two approaches and with favourable alignment of the cup. Copyright © 2008 John Wiley & Sons, Ltd.