X-Ray photogrammetry of artificial hip joints

Alan R. Turner-Smith; Steven P. White; Christopher Bulstrode

doi:10.1117/12.2294318

1 August 1990 X-Ray photogrammetry of artificial hip joints

Alan R. Turner-Smith, Steven P. White, Christopher Bulstrode

Proceedings Volume 1395, Close-Range Photogrammetry Meets Machine Vision; 139523 (1990) https://doi.org/10.1117/12.2294318
Event: Close-Range Photogrammetry Meets Machine Vision, 1990, Zurich, Switzerland

Abstract

A current major interest in orthopaedics is the improvement in the longevity and reliability of artificial hip joints, whose ultimate life is usually limited by failure of the implant/bone interface and sinkage of the implant. Measurement of movement at this interface during the first two years on an implant's life is expected to correlate closely with the overall life-span of a total joint replacement, but these movements are too small to be measured by conventional, uni-planar radiography. Other workers have demonstrated the value of X-ray stereo photogrammetry for this application and have shown that the mathematics of analytical reconstruction is simplified by the absence of many distortions normally present in conventional photogrammetry. However, X-ray photogrammetry of the human hip under normal load presents some particular practical problems including degradation of the X-ray image due to the large size of the object, support of the infirm patient, landmark identification on the bone and implanted components, and ease of film measurement. We report here on the performance of a number of novel approaches to these problems intended to reduce X-ray stereo photogrammetry to a manageable clinical research technique. These have been implemented at the Nuffield Orthopaedic Centre for application to substantial numbers of patients in clinical trials.

Citation Download Citation

Alan R. Turner-Smith, Steven P. White, and Christopher Bulstrode "X-Ray photogrammetry of artificial hip joints", Proc. SPIE 1395, Close-Range Photogrammetry Meets Machine Vision, 139523 (1 August 1990); https://doi.org/10.1117/12.2294318

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