Comparative mechanical axis deviation after TKA between conventional and CAS procedure
Leelasestaporn, C.
Journal of the Medical Association of Thailand 93(2): 205-210
2010
ISSN/ISBN: 0125-2208 PMID: 20302002 Document Number: 11610
The purpose of the present study was to report the results of radiographic comparisons made between CAS-TKA and conventional TKA. The authors retrospectively compared 102 knee radiographs from conventional TKA to 84 knees from CAS-TKA. The mean mechanical axis deviation was 2.77 degrees for conventional TKA and 1.80 degrees for CAS-TKA (p = 0.0002). For conventional TKA 42.2% of the results were considered to be outliers versus only 14.3% outlier frequency among the CAS-TKA procedures (p < 0.0001). Only 54.4% of scanograms were proper for the presented analysis due to improper anterior-posterior positioning. Implementation of a corrective standing block eliminated this issue. CAS-TKA significantly reduces both margins of error in knee alignment and frequency of outlier compared with conventional TKA. Further investigation to compare long-term results of CAS-TKA with conventional TKA is recommended.
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