Abstracts Posters SICOT-SOF meeting Gothenburg 2010 _2_

Poster
Topic: Minimally Invasive Surgery - Knee
Abstract number: 24598
MINIMALLY INVASIVE TOTAL KNEE ARTHROPLASTY WITH IMAGE-FREE
NAVIGATION COMPARED WITH MANUAL IMPLANTATION
Masahiro HASEGAWA, Kakunoshin YOSHIDA, Hiroki WAKABAYASHI, Akihiro
SUDO
Department of Orthopaedic Surgery, Mie University Graduate School of Medicine,
Tsu City, Mie (JAPAN)
Introduction: Correct alignment of the leg and positioning of the component has been
shown to be an important factor in the good long-term outcome of total knee
arthroplasty (TKA). Minimally invasive surgery (MIS) TKA has gained popularity over
the past several years. We combined the accuracy of navigation systems with MIS.
Materials and Methods: We evaluated two groups of 100 patients who had MIS TKA
using either an image-free navigation system or a manual implantation. Clinical
evaluations were performed using range of motion preoperatively and postoperatively
as well as ratings according to the system of the Knee Society preoperatively and at
6 months postoperatively. We performed radiological evaluation using full-length
standing anteroposterior and lateral radiographs and CT scans of the knee at 6
months postoperatively. Results: Range of motion was comparable in the two groups
at all times. There were no significant differences between the two groups as regards
knee score and function score preoperatively and at 6 months postoperatively. The
percentage of patients with a coronal tibiofemoral angle within 3 degrees of the ideal
in the navigated TKA was significantly higher (94 %) compared with manual TKA (78
%, P=0.04). No notable differences were found between the two groups as regards
the coronal and sagittal planes and rotational alignment of the femoral or tibial
components. Conclusion: Navigation-assisted TKA could give a better correction of
alignment of the leg compared with manual TKA when combined with MIS. Potential
benefits in long-term outcome require further investigation.
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