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Journal of Bone and Joint Surgery - British Volume, Vol 88-B, Issue 7, 972-975.
doi: 10.1302/0301-620X.88B7.17468  
Copyright © 2006 by British Editorial Society of Bone and Joint Surgery
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Computer navigation of the acetabular component

A CADAVER RELIABILITY STUDY

J. M. F. Spencer, FRCS(Tr & Orth), Arthroplasty Fellow1; R. E. Day, BEng, M Biomed Eng, Bioengineer1; K. E. Sloan, MSc, Project Coordinator2; and R. J. Beaver, FRACS, Head of Department3

1 Department of Medical Engineering & Physics
2 Joint Replacement Assessment Clinic
3 Elective Orthopaedic Department, Royal Perth Hospital, 6 Selby Street, Shenton Park, Perth 6008, Western Australia.

Correspondence should be sent to Mr R. J. Beaver; e-mail: rjbeav{at}bigpond.com

Our aim was to assess the intra- and inter-observer reliability in the establishment of the anterior pelvic plane used in imageless computer-assisted navigation. From this we determined the subsequent effects on version and inclination of the acetabular component.

A cadaver model was developed with a specifically-designed rod which held the component tracker at a fixed orientation to the pelvis, leaving the anterior pelvic plane as the only variable. Eight surgeons determined the anterior pelvic plane by palpating and registering the bony landmarks as reference points. The exact anterior pelvic plane was then established by using anatomically-placed bone screws as reference points.

The difference between the surgeons was found to be highly significant (p < 0.001). The variation was significantly larger for anteversion (SD 9.6°) than for inclination (SD 6.3°). The present method for registering pelvic landmarks shows significant inaccuracy, which highlights the need for improved methods of registration before this technique is considered to be safe.




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S. Parratte, P. Kilian, V. Pauly, P. Champsaur, and J.-N. A. Argenson
The use of ultrasound in acquisition of the anterior pelvic plane in computer-assisted total hip replacement: A CADAVER STUDY
J Bone Joint Surg Br, February 1, 2008; 90-B(2): 258 - 263.
[Abstract] [Full Text] [PDF]


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Hip, Knee, Trauma, Upper limb, Foot & Ankle, Paediatrics, Oncology, Spine, Arthroplasty, General