Home About Journal AHEAD OF PRINT Current Issue Back Issues Instructions Submission Search Subscribe Blog    

Users Online: 1091 
Print this page  Email this page Small font sizeDefault font sizeIncrease font size 
Year : 2013  |  Volume : 47  |  Issue : 1  |  Page : 77-82

Component alignment and functional outcome following computer assisted and jig based total knee arthroplasty

Department of Orthopaedic Surgery, Arthroplasty and Sports Medicine, Amrita Institute of Medical Sciences and Research Institute, Kochi, Kerala, India

Correspondence Address:
Dnyanesh G Lad
67/F Gilder House, B. Desai Road, Mumbai - 400 026
Login to access the Email id

Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0019-5413.106915

Rights and Permissions

Background: Incorrect positioning of the implant and improper alignment of the limb following total knee arthroplasty (TKA) can lead to rapid implant wear, loosening, and suboptimal function. Studies suggest that alignment errors of > 3° are associated with rapid failure and less satisfactory function. Computer navigated systems have been developed to enhance precision in instrumentation during surgery. The aim of the study was to compare component alignment following computer assisted surgery (CAS) and jig based TKA as well as functional outcome. Materials and Methods: This is a prospective study of 100 knees to compare computer-assisted TKA and jig-based surgery in relation to femoral and tibial component alignment and functional outcome. The postoperative x-rays (anteroposterior and lateral) of the knee and CT scanogram from hip to foot were obtained. The coronal alignment of the femoral and tibial components and rotational alignment of femoral component was calculated. Knee society score at 24 months was used to assess the function. Results: Results of our study show that mean placement of the tibial component in coronal plane (91.3037°) and sagittal planes (3.6058°) was significantly better with CAS. The difference was statistically insignificant in case of mean coronal alignment of the femoral components (90.34210° in navigation group and 90.5444° in jig group) and in case of the mean femoral condylar twist angle (external rotation 2.3406° in navigation group versus 2.3593° in jig group). Conclusions: A significantly improved placement of the component was found in the coronal and sagittal planes of the tibial component by CAS. The placement of the components in the other planes was comparable with the values recorded in the jig-based surgery group. Functional outcome was not significantly different.

Print this article     Email this article
 Next article
 Previous article
 Table of Contents

 Similar in PUBMED
   Search Pubmed for
   Search in Google Scholar for
 Related articles
 Citation Manager
 Access Statistics
 Reader Comments
 Email Alert *
 Add to My List *
 * Requires registration (Free)

 Article Access Statistics
    PDF Downloaded159    
    Comments [Add]    
    Cited by others 6    

Recommend this journal