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To investigate the effects of patient bone mass differences on the stability of unicondylar knee arthroplasty (UKA) prostheses.
A UKA finite element model was established to quantify the effects of five different bone quality conditions on the proximal tibial von Mises stress, bone-prosthesis fixation interface contact stress, and bone-prosthesis fixation interface micromotion, using the medial knee force and joint motion predicted by the individualized UKA musculoskeletal multibody dynamics model as boundary conditions.
The influences of bone strength on the proximal tibia von Mises stress and bone-prosthesis fixation interface contact stress were not obvious, and the difference in peak values of the proximal tibia von Mises stress between two groups of models with the largest difference in bone strength was not more than 5%, and the difference in peak values of the bone-prosthesis fixation interface contact stress was only 2.37 MPa. However, the influence of bone strength on the bone-prosthesis fixation interface micromotion was significant, and the weaker bones were more prone to cause the bone-prosthesis fixation interface micromotion. However, bone strength had a significant effect on the bone-prosthesis fixation interface micromotion, and weak bone was more likely to cause changes in the bone-prosthesis fixation interface micromotion. Compared to patients with the neutral bone quality, the prosthesis fixation interface micromotion increased by 84.67% at 20% gait cycles for patients with the weakest bone quality.
UKA patients with a weaker bone quality have a higher risk of prosthesis loosening. It is recommended that surgeons should carefully choose their surgical strategy in order to reduce the rate of postoperative revision in UKA.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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