Imageless computer navigation in total knee arthroplasty.
OBJECTIVE
To study the difference in clinical and radiological outcomes between imageless computer-navigated and the conventional technique for performing total knee arthroplasty.


METHODS
Prospective case-control study.


METHODS
University teaching hospital, Hong Kong.


METHODS
Forty-seven patients with imageless computer-navigated total knee arthroplasty were matched with 47 patients with total knee arthroplasty using conventional technique over the period 2003 to 2007.


METHODS
Postoperative radiological alignment, tourniquet time, Knee Society knee score and functional score, and range of motion.


RESULTS
The femoral anteroposterior, tibial anteroposterior, overall anteroposterior alignment of the lower limb, and lateral femoral lateral flexion angle had significantly less deviation from neutral alignment in those having computer-assisted total knee arthroplasty than conventional total knee arthroplasty. The former had significantly fewer outliers (>3 degrees from neutral alignment) than the latter, in both the coronal and sagittal planes of the femoral and tibial sides. The mean tourniquet time was significantly longer in the former (111 minutes) than in those having a conventional arthroplasty (98 minutes). There was no tracker/pin tract complication or wound infection in either group.


CONCLUSIONS
Computer-assisted navigation can give a better alignment than the conventional technique, but the tourniquet time was significantly longer. Computer-assisted navigation surgery can help the surgeon in determining limb alignment during the operation.
Cheung
K W
KW
Department of Orthopaedics and Traumatology, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong. kwcheung@ort.cuhk.edu.hk
Chiu
K H
KH
D000368:Aged; D019645:Arthroplasty, Replacement, Knee / Q000379:methods*; D016022:Case-Control Studies; D005260:Female; D006785:Hospitals, University; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D016059:Range of Motion, Articular; D020127:Recovery of Function; D025321:Surgery, Computer-Assisted / Q000379:methods*; D013997:Time Factors; D014111:Tourniquets