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To study the effect of medial collateral ligament (MCL) release on the squatting motion followling total knee arthroplasty (TKA) and provide reference data for ligament release during knee replacement surgery.
Based on CT and MRI images of a volunteer, a three-dimensional (3D) geometric anatomical model of the natural knee joint including bone tissues and major soft tissues was established. A finite element model of the artificial knee joint was established by simulating TKA surgery. The squatting motion after 30% release of the upper end, lower end, and both ends of the MCL was simulated, and motion characteristic data of the knee joint at flexion/extension angles from 0° to 135° were obtained.
The effects of ligament release at different locations on knee squatting motion varied. After releasing the lower end, the medial translation, posterior translation, superior translation, and adduction of the femur relative to the tibia increased by 13.74%, 3.83%, 9.74%, and 2.37%, respectively, while the external rotation decreased by 36.8%. After releasing the upper end, the medial translation and posterior translation increased by 10.65% and 10%, respectively, while the superior translation, adduction, and external rotation decreased by 4.52%, 33.89%, and 67.1%, respectively. After releasing both ends, the medial translation, posterior translation, and superior translation increased by 14.77%, 9.39%, and 22.56%, respectively, while the adduction and external rotation decreased by 15.62% and 47.3%, respectively.
After MCL released, the medial translation, anterior translation, superior translation, and abduction of the femur relative to the tibia increased, while the external rotation decreased. Releasing the lower end had the least effect on these femoral movements, showing an obvious advantage.
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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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