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MULTIPARAMETER QUANTITATIVE COMPUTER-ASSISTED TOMOGRAPHY ASSESSMENT OF UNICOMPARTMENTAL KNEE ARTHROPLASTIES.
- Source :
-
ANZ Journal of Surgery . Sep2006, Vol. 76 Issue 9, p782-787. 6p. 5 Black and White Photographs, 1 Chart. - Publication Year :
- 2006
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Abstract
- Background: Unicompartmental knee arthroplasty is a popular alternative to total knee replacement in selected patients. Component alignment has not yet been described by computer-assisted tomography (CAT) imaging techniques; these have been developed for total knee arthroplasty analysis. The aims of this study were to report two new technologies; a new unicompartmental knee arthroplasty system was radiographically assessed with a new CAT scan protocol. Methods: In a consecutive cohort study, 60 knees were analysed by the ‘UniCAT Protocol’. Patients were implanted with a unicompartmental knee arthroplasty system that uses a unique ligament tensor for femoral component alignment. The uniCAT protocol requires a long anteroposterior and lateral scout scan to measure limb alignment and component orientation. A spiral computer-assisted tomography at the knee is used to measure component rotation. The total scan time was 20 s with a calculated unshielded radiation dose of 1 mSv or less. Results: The mechanical axis had a mean of 2.7° varus. Femoral components were implanted with a mean of 0.37° valgus and 1.3° flexion. Tibial components were implanted with a mean 3.47° varus and 5.1° posterior slope. Femoral components were externally rotated a mean of 3.36°, tibial components were externally rotated 6.59° from the posterior tibia and 5.68° from the transepicondylar axis. Conclusion: The UniCAT protocol uses less radiation than whole-limb spiral scans and is a method that can be used with all modern computer-assisted tomography machines. The coronal and sagital alignment results compare favourably with previous published reports without computer-assisted tomography. Component rotation has not previously been reported and its implications are yet to be defined. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14451433
- Volume :
- 76
- Issue :
- 9
- Database :
- Academic Search Index
- Journal :
- ANZ Journal of Surgery
- Publication Type :
- Academic Journal
- Accession number :
- 21936270
- Full Text :
- https://doi.org/10.1111/j.1445-2197.2006.03867.x