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Publication Detail
Ultrasound-based registration for minimally-invasive orthopaedic surgery
  • Publication Type:
  • Authors:
    Barratt DC, Penney GP, Slomczykowski M, Hawkes DJ
  • Publication date:
  • Published proceedings:
    Presentations by Britain's Top Younger Scientists, Engineers and Technologists at The House of Commons
The use of medical images to guide the surgeon plays a critical role in enabling minimally-invasive orthopaedic procedures to be performed safely and effectively. A fundamental task during such procedures is to register a preoperative (CT) scan with the patient in the operating theatre. However, conventional registration methods are highly invasive, which require surgical exposure of the bone surface in order to digitise surface points using a handheld pointer. Our recent research has focused on developing non-invasive ultrasound-based methods for bone registration, which i) require minimal user interaction [1], and ii) automatically compensate for significant errors introduced by inter-patient variations in the speed-of-sound in soft-tissue overlying bone [2]. Rigorous evaluation of the accuracy of ultrasound-based registration of the femur and pelvis (relevant for total hip replacement) using human cadavers resulted in an average error of 1.6mm (range = 0.5 to 3.1mm). We conclude that ultrasound-based registration has an accuracy comparable to, if not better than, conventional pointer-based techniques, which we hope will enable the advantages of minimally-invasive surgery to be fully exploited in future image-guidance systems. Ongoing work, supported by the EPSRC and DTI, is concentrating on developing a low-cost clinical product in close collaboration with industry.
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