Artikel
Mobile bearing leads to less proximal medial tibial strain following UKA in comparison with fixed bearing in a cadaver setup
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Autoren
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Thomas J. Heyse
- ORTHOmedic Frankfurt Offenbach, Offenbach, Germany
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Geert Peersman
- ZNA Stuivenberg, Antwerpen, Belgium
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Orcun Taylan
- Institute for Orthopaedic Research and Training, KU Leuven, Pellenberg, Belgium
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Joshua Slane
- Department of Orthopaedics, Katholieke Universiteit Leuven, Pellenberg, Belgium
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Ben Vanthienen
- Department of Orthopaedics, Katholieke Universiteit Leuven, Pellenberg, Belgium
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Harry van Lenthe
- Institute for Orthopaedic Research and Training, KU Leuven, Pellenberg, Belgium
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Lennart Scheys
- Department of Orthopaedics, Katholieke Universiteit Leuven, University Hospital Pellenberg, Pellenberg, Belgium
| Veröffentlicht: | 6. November 2018 |
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Gliederung
Text
Objectives: Inexplicable pain to the medial proximal tibia is a frequent finding leading to revision after unicondylar knee arthroplasty (UKA). This study is an effort to find out, if there are any differences between mobile (MB) and fixed bearing (FB) UKA designs in terms of resulting strain in the medial proximal tibia as measured in an in vitro cadaver setup. It was hypothesized that MB UKA would result in lower bone strain
Methods: Five pairs of fresh-frozen full leg cadaver specimens were mounted in a kinematic rig that applied a dynamic squatting motion knee flexion after prior 3D CT. The rig allowed for 6 degrees-of-freedom at the knee while forces were applied to the quadriceps and hamstrings. During testing, an infrared camera system tracked the location of reflective markers attached to the tibia and femur with bicortical bone pins. Tibial cortical bone strain was measured with stacked strain gauge rosettes attached at predefined anterior and posterior positions on the medial cortex. Sensor outputs were recorded at 2000 Hz and synchronized with kinematic data prior and after pairwise implantation of MB and FB UKA directly comparing those between left and right knees from the same donor.
Results and conclusion: Bone strain values consistently increased with increasing flexion angle. FB UKA significantly increased strain in the anterior region of the medial tibial bone, while MB closely replicated strain values of the native knee.
Proximal tibial bone strain seems to be lesser following MB UKA in comparison with FB UKA. Clinical studies will have to show, if this translates into a higher rate of pain problems with FB UKA.
