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Extramedullary or intramedullary tibial alignment guides: a randomised, prospective trial of radiological alignment

Department of Orthopaedics, Wansbeck General Hospital, Ashington NE63 9JJ, UK.

Correspondence should be sent to Mr. M. R. Reed.

We undertook a prospective, randomised study of 135 total knee arthroplasties to determine the most accurate and reliable technique for alignment of the tibial prosthesis. Tibial resection was guided by either intramedullary or extramedullary alignment jigs.

Of the 135 knees, standardised postoperative radiographs suitable for assessment were available in 100. Correct tibial alignment was found in 85% of the intramedullary group compared with 65% of the extramedullary group (p = 0.019).

We conclude that intramedullary guides are superior to extramedullary instruments for alignment of the tibial prosthesis.

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