The trochlea is medialized by total knee arthroplasty: an intraoperative assessment in 61 patients.
Publication year
2007Source
Acta Orthopaedica Scandinavica, 78, 1, (2007), pp. 123-7ISSN
Publication type
Article / Letter to editor
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Organization
Orthopaedics
Radboudumc Extern
Journal title
Acta Orthopaedica Scandinavica
Volume
vol. 78
Issue
iss. 1
Page start
p. 123
Page end
p. 7
Subject
NCEBP 10: Human Movement & Fatigue; UMCN 4.3: Tissue engineering and reconstructive surgeryAbstract
BACKGROUND: A medialization of the femoral component in a total knee arthroplasty (TKA) causes abnormal patellar tracking, which could result in patellar instability, pain, wear, and failure. Previous reports defined medialization in relation to the neutral position of the femoral component, but omitted to compare it to the anatomical position of the trochlea. We assessed intraoperatively whether there is a systematic error of the position of the prosthetic groove relative to the anatomical trochlea. MATERIAL AND METHODS: A special instrument was developed to measure consecutively the mediolateral position of the anatomical trochlea and the mediolateral position of the prosthetic groove. 3 experienced knee surgeons determined the mediolateral error of the prosthetic groove in primary TKAs in 61 patients. RESULTS: There was a significant medial error of the prosthetic groove relative to the preoperative position of the trochlea, with a mean medial error of 2.5 mm (SD 3.3) INTERPRETATION: Our findings indicate that the trochlea is medialized by TKA. Because a conscious medialization of the femoral component in a TKA produces abnormal patellar tracking patterns, further investigations will be needed to analyze the clinical consequences of this medialization of the trochlea.
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- Faculty of Medical Sciences [90373]
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