A hybrid CT-free navigation system for total hip arthroplasty

Zheng, Guoyan; Marx, Axel; Langlotz, Ulrich; Widmer, Karl-Heinz; Buttaro, Martin; Nolte, Lutz-Peter (2002). A hybrid CT-free navigation system for total hip arthroplasty. Computer aided surgery, 7(3), pp. 129-145. Taylor & Francis 10.1002/igs.10039

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OBJECTIVE:
To design and evaluate a novel CT-free image-guided surgical navigation system for assisting placement of both acetabular and femoral components in total hip arthroplasty (THA).

MATERIALS AND METHODS:
The methodology in this paper is conceptually based on our previous work on CT-free cup placement. For femoral component placement, two patient-specific reference coordinate systems are first defined: One for the pelvis, based on the so-called anterior pelvic plane (APP) concept, and one for the femur, using the center of the femoral head, the posterior condylar tangential line, and the medullary canal axis of the proximal femur. A hybrid method is used for the associated landmark acquisition, which involves percutaneous point-based digitization and bi-planar landmark reconstruction using multiple registered fluoroscopy images. The following clinical parameters are computed in real time: cup inclination and anteversion, antetorsion and varus/valgus of the stem, lateralization, and change in leg length for complete THA. In addition, instrument actions such as reaming, impaction, and rasping are visualized for the surgeon by superimposing virtual instrument representations onto the fluoroscopic images.

RESULTS:
A laboratory study of computer-assisted measurement of antetorsion and varus/valgus, change in leg length, and lateralization for femoral stem placement demonstrated the high precision of the proposed navigation system. Compared with CT-based measurement, mean deviations of 1.0 degrees, 0.6 degrees, 0.7 mm, and 1.7 mm were found for antetorsion, varus/valgus, change in leg length, and lateralization, respectively, with standard deviations of 0.5 degrees, 0.5 degrees, 0.6 mm, and 0.7 mm, respectively. A pilot clinical evaluation showed that THA could benefit from this newly developed CT-free hybrid system.

CONCLUSIONS:
The proposed CT-free hybrid system promises to increase the accuracy and reliability of THA surgery.

Item Type:	Journal Article (Original Article)
Division/Institute:	04 Faculty of Medicine > Pre-clinic Human Medicine > Institute for Surgical Technology & Biomechanics ISTB [discontinued]
UniBE Contributor:	Zheng, Guoyan, Nolte, Lutz-Peter
Subjects:	500 Science > 570 Life sciences; biology 600 Technology > 610 Medicine & health
ISSN:	1092-9088
Publisher:	Taylor & Francis
Language:	English
Submitter:	Guoyan Zheng
Date Deposited:	26 Jul 2017 14:20
Last Modified:	05 Dec 2022 14:56
Publisher DOI:	10.1002/igs.10039
PubMed ID:	12362374
URI:	https://boris.unibe.ch/id/eprint/82194