Abstract
Introduction: Template use prior to hip arthroplasty is a valuable form of pre-operative planning. The femoral neck anteversion may influence the interpretation of the femoral off-set on plain x-rays
Method: The femoral neck anteversion of a series of adult patients with developmental hip dysplasia has been assessed using CT guided measurement. Using this data and more normal ranges of anteversion we have been able to estimate the effect of anteversion on perceived off-set.
Results: Femoral neck anteversion significantly effects the perceived offset at angles of greater than 20 degrees. The average femoral neck anteversion in our series of patients with hip dysplasia was 22 degrees. With a perceived off-set of 40mm on an AP x-ray the actual offset becomes 44mm in a patient when the patient has 25 degrees of anteversion.
Conclusion: Femoral neck anteversion is an important factor when considering the appearance of plain hip x-rays. Recognition of this factor may improve the ability of the operating surgeon to assess the correct components pre-operatively.
The abstracts were prepared by Mr Peter Kay, Editorial Secretary. Correspondence should be addressed to British Hip Society, The Hip Centre, Wrightington Hospital, Appley Bridge, Wigan, Lancashire WN6 9EP.
