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Erschienen in: Knee Surgery, Sports Traumatology, Arthroscopy 8/2014

01.08.2014 | Knee

Comparison of stability and kinematics of the natural knee versus a PS TKA with a ‘third condyle’

verfasst von: Stefano Zaffagnini, Simone Bignozzi, Mo Saffarini, Francesca Colle, Bharat Sharma, Plamen Slavov Kinov, Maurilio Marcacci, David Dejour

Erschienen in: Knee Surgery, Sports Traumatology, Arthroscopy | Ausgabe 8/2014

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Abstract

Purpose

The goal of this study was to compare the kinematics of knees before and after total knee arthroplasty (TKA) that relies on an inter-condylar ‘third condyle’. The hypothesis was that the ‘third condyle’ provides sufficient flexion stability and induces a close to normal femoral rollback, thus granting natural joint kinematics.

Methods

Intra-operative navigation data were collected from 29 consecutive cases that received a cemented TKA (HLS Noetos, Tornier SA, France) designed with an inter-condylar ‘third condyle’ that engages within the tibial insert beyond 35° flexion. Operations were guided by a non-image-based system (BLU-IGS, Orthokey Italia srl, Italy) that recorded relative femoral and tibial positions in native and implanted knees during: passive range of motion, anterior drawer test at 90° flexion, and varus–valgus stress tests at full extension and at 30° flexion.

Results

The total internal tibial rotation during flexion was similar for native (8.2 ± 4.2°) and implanted knees (8.0 ± 5.4°). The lateral femoral condyle was more posterior in implanted knees (1.2 ± 9.4 mm) than in native knees (9.5 ± 3.6 mm) throughout early flexion (p < 0.01), but this difference diminished beyond 100° flexion (n.s.). The implanted knees did not exhibit paradoxical external tibial rotation. Varus–valgus laxity in full extension was lower for implanted knees than for native knees (p = 0.0221), but at 30° flexion was almost identical for both native and implanted knees. Anteroposterior laxity was similar in implanted and native knees.

Conclusions

The ‘third condyle’ TKA provides similar anteroposterior and mediolateral stability to the natural knee. This feature granted an adequate balance between laxity and constraint to reproduce natural joint kinematics, including smooth femoral rollback, without causing paradoxical external tibial rotation.

Level of evidence

Comparative study, Level III.
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Metadaten
Titel
Comparison of stability and kinematics of the natural knee versus a PS TKA with a ‘third condyle’
verfasst von
Stefano Zaffagnini
Simone Bignozzi
Mo Saffarini
Francesca Colle
Bharat Sharma
Plamen Slavov Kinov
Maurilio Marcacci
David Dejour
Publikationsdatum
01.08.2014
Verlag
Springer Berlin Heidelberg
Erschienen in
Knee Surgery, Sports Traumatology, Arthroscopy / Ausgabe 8/2014
Print ISSN: 0942-2056
Elektronische ISSN: 1433-7347
DOI
https://doi.org/10.1007/s00167-014-3016-3

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