Email updates

Keep up to date with the latest news and content from Journal of Orthopaedic Surgery and Research and BioMed Central.

Open Access Research article

Intramedullary versus extramedullary alignment of the tibial component in the Triathlon knee

James P Cashman1*, Fiona L Carty2, Keith Synnott1 and Paddy J Kenny1

Author Affiliations

1 Department of Orthopaedics, Cappagh National Orthopaedic Hospital, Finglas, Dublin 13, Ireland

2 Department of Radiology, Cappagh National Orthopaedic Hospital, Finglas, Dublin 13, Ireland

For all author emails, please log on.

Journal of Orthopaedic Surgery and Research 2011, 6:44  doi:10.1186/1749-799X-6-44

Published: 20 August 2011

Abstract

Background

Long term survivorship in total knee arthroplasty is significantly dependant on prosthesis alignment. Our aim was determine which alignment guide was more accurate in positioning of the tibial component in total knee arthroplasty. We also aimed to assess whether there was any difference in short term patient outcome.

Method

A comparison of intramedullary versus extramedullary alignment jig was performed. Radiological alignment of tibial components and patient outcomes of 103 Triathlon total knee arthroplasties were analysed.

Results

Use of the intramedullary was found to be significantly more accurate in determining coronal alignment (p = 0.02) while use of the extramedullary jig was found to give more accurate results in sagittal alignment (p = 0.04). There was no significant difference in WOMAC or SF-36 at six months.

Conclusion

Use of an intramedullary jig is preferable for positioning of the tibial component using this knee system.