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Title of Journal: Arch Orthop Trauma Surg

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Abbravation: Archives of Orthopaedic and Trauma Surgery

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Springer Berlin Heidelberg

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DOI

10.1016/0926-2245(91)90027-7

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ISSN

1434-3916

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Computerassisted stereotaxic navigation improves

Authors: Ming Han Lincoln Liow Graham SeowHng Goh HeeNee Pang Darren Keng Jin Tay Ngai Nung Lo Seng Jin Yeo
Publish Date: 2016/06/27
Volume: 136, Issue: 8, Pages: 1173-1180
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Abstract

This study reports on a novel computerassisted stereotaxic navigation CASN system that attempts to combine the accuracy of computer navigation with familiarity of conventional methods We hypothesize that CASN would improve mechanical alignment and component positioning when compared to conventional instrumentation145 patients 192 knees retrospectively matched for age BMI gender and preoperative scores underwent total knee arthroplasty TKA using CASN n = 92 or conventional instrumentation n = 100 Pre and postoperative radiological alignment Acceptable ranges mechanical axis MA 0° ± 3° coronal femoralcomponent angle CFA and coronal tibiacomponent angle CTA 90° ± 3° and clinical outcomes Knee Society Scores Oxford Knee Score and Short Form36 at 6 months were examinedThe CASN group had significantly improved mean MA 19° ± 14° versus 28° ± 20° in the conventional group p = 0001 CFA 16° ± 13° versus 21° ± 15° in the conventional group p = 0035 and CTA 16° ± 12° versus 21° ± 15° in the conventional group p = 0024 913  of knees in the CASN group were within 3° of a neutral mechanical axis versus 74  in the conventional group p  0001 The duration of surgery was significantly longer in the CASN group 84 ± 22 vs 73 ± 15 min p = 0001 and cost an additional USD 850 per operation There were no significant differences in clinical outcomes or satisfaction rates at 6 months postoperatively p  005CASN improved TKA mechanical alignment and component positioning however resulted in longer and costlier surgery with no benefits in shortterm functional outcomes despite providing familiarity to surgeons accustomed to conventional instrumentation

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