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Type: Journal article
Title: Multiparameter quantitative computer-assisted tomography assessment of unicompartmental knee arthroplasties
Author: Campbell, D.
Johnson, L.
West, S.
Citation: ANZ Journal of Surgery, 2006; 76(9):782-787
Publisher: Blackwell Science Asia
Issue Date: 2006
ISSN: 1445-1433
Statement of
Campbell, David G.; Johnson, Luke J.; West, Simon C.
Abstract: <h4>Background</h4>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.<h4>Methods</h4>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.<h4>Results</h4>The mechanical axis had a mean of 2.7 degrees varus. Femoral components were implanted with a mean of 0.37 degrees valgus and 1.3 degrees flexion. Tibial components were implanted with a mean 3.47 degrees varus and 5.1 degrees posterior slope. Femoral components were externally rotated a mean of 3.36 degrees, tibial components were externally rotated 6.59 degrees from the posterior tibia and 5.68 degrees from the transepicondylar axis.<h4>Conclusion</h4>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.
Keywords: Knee Joint
Osteoarthritis, Knee
Tomography, X-Ray Computed
Arthroplasty, Replacement, Knee
Cohort Studies
DOI: 10.1111/j.1445-2197.2006.03867.x
Appears in Collections:Aurora harvest 6
Orthopaedics and Trauma publications

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