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The femoral component should be implanted parallel to the mechanical axis in unicompartmental knee arthroplasty. It was hypothesised that a line between medial femoral condyle centres and medial border of femoral head will be parallel to the mechanical axis; this study set out to examine this hypothesis.One hundred X-rays in fifty patients were included for this study. Long-leg standing X-rays including hip and ankle with patellae facing forwards were obtained. On these films, we measured the angle, α, between mechanical axis and the line between the femoral head centre and knee centre (medial mechanical axis), and the angle, β, between the medial mechanical axis and a line between medial femoral condyle and femoral head centre.The average value of α was 0.1 ± 0.5° and the average value of β 3.0° ± 0.3°. These data indicate that mechanical axis and medial mechanical axis are virtually parallel to each other.As medial femoral head border is easily identified fluoroscopically, it is a reliable landmark for orientating the femoral component of medial UKA.

Original publication

DOI

10.1007/s00167-012-2227-8

Type

Journal article

Journal

Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA

Publication Date

11/2013

Volume

21

Pages

2442 - 2446

Addresses

Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences (NDORMS), University of Oxford, Windmill Road, Headington, Oxfordshire, Oxford, OX3 7HE, UK, takafumi.hiranaka@gmail.com.

Keywords

Femur, Knee Joint, Humans, Joint Diseases, Tomography, X-Ray Computed, Arthroplasty, Replacement, Knee, Knee Prosthesis, Aged, Aged, 80 and over, Female, Male