Article

We investigated the accuracy of the regression equations by Bell et al., Davis
III et al. and Harrington et al. for hip joint centre (HJC) estimation against
the gold standard of computerised tomography (CT) measurements of HJC for 18
patients with metal-on-metal hip resurfacing arthroplasty (MoMHRA). The HJCs were
estimated based on the position of the left and right Anterior Superior Iliac
Spine (ASIS) and the left and right Posterior Superior Iliac Spine (PSIS)
identified from a CT scan. Of the three tested regression equations, only those
of Harrington et al. produced results that were not significantly different from
the patient's 'true' HJCs as measured from the CT scan in all three directions
when analysing left and right hips together for both resurfaced and native hips.
When native and resurfaced hips were pooled and analysed for left and right,
separately, the Harrington et al. regression equations showed significantly
different results in the ML direction. Similar estimation errors were observed
for native and resurfaced hips. Since none of the methods tested performed
particularly well, we suggest using medical imaging if accurate estimates of HJCs
are required.
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Langue : ANGLAIS