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BMC Musculoskeletal Disorders
Published in: BMC Musculoskeletal Disorders 1/2005

Open Access 01-12-2005 | Research article

Dynamic in vitro measurement of patellar movement after total knee arthroplasty: an in vitro study

Authors: Sven Ostermeier, Olaf Buhrmester, Christof Hurschler, Christina Stukenborg-Colsman

Published in: BMC Musculoskeletal Disorders | Issue 1/2005

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Abstract

Background

Changing the kinematic behaviour of patellar movement could be one of the reasons for anterior knee pain after implantation of a total knee arthroplasty (TKA). The aim of the current study was to measure the potential influence on patellar kinematics of patellar resurfacing during TKA.

Methods

Patellar movement before and after TKA with and without patellar resurfacing was measured under dynamic conditions in an in vitro cadaver simulation. Physiologic Musculus quadriceps forces were applied to five physiologic human knee specimens undergoing simulated isokinetic extension motions, patellar movement was measured using an ultrasonic measurement system. Thereafter, the Interax® I.S.A.-prosthesis system was implanted without and with resurfacing the patella, and patellar movement was again measured.

Results

The physiologic patella center moved on a semilunar path up to 6.4 mm (SD 6.4 mm) medially during extension. After TKA, the unresurfaced patella showed significantly less medial translation (p = 0.04) than the resurfaced patella. Subsequent resurfacing of the patella then resulted in a return to mediolateral positioning of the patella similar to the physiological case, whereas the resurfaced patella tilted up to twice as much as physiologic.

Conclusion

The results of this study suggest that resurfacing of the patella during TKA can result in a restoration of the physiologic mediolateral shift of the patellofemoral joint while angulation of the patella remains unphysiologic.
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Metadata
Title
Dynamic in vitro measurement of patellar movement after total knee arthroplasty: an in vitro study
Authors
Sven Ostermeier
Olaf Buhrmester
Christof Hurschler
Christina Stukenborg-Colsman
Publication date
01-12-2005
Publisher
BioMed Central
Published in
BMC Musculoskeletal Disorders / Issue 1/2005
Electronic ISSN: 1471-2474
DOI
https://doi.org/10.1186/1471-2474-6-30

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