Lew W D, Lewis J L
J Bone Joint Surg Am. 1982 Jun;64(5):734-9.
We used buckle transducers in conjunction with a mathematical model to investigate the mechanics of the cruciate ligaments during flexion of knees containing prostheses with differing component geometries. With normal component placement and both cruciate ligaments intact, the full range of flexion is restricted in a knee with the conforming, single radius-of-curvature geometric prosthesis because of large constraint forces in the posterior cruciate ligament. Ligament incompatibility is avoided with multicurvature designs, as represented by the kinematic prosthesis. Low conformity of components allows anterior-posterior displacements to accompany flexion, which provides for a full range of flexion and allows cruciate ligament forces to approach those of a normal knee.
This analysis points out that special precautions must be taken to avoid ligament constraint forces (and potential loosening) if an implant with highly conforming components is used when both cruciate ligaments are intact. The information presented here, relating implant geometry to cruciate ligament mechanics, must be considered when choosing an appropriate prosthetic design to ensure ligament compatibility in the presence of one, both, or no cruciate ligaments.
我们使用扣式换能器结合数学模型，来研究在膝关节屈曲过程中，包含不同部件几何形状假体的十字韧带力学。在正常部件放置且两条十字韧带均完整的情况下，具有顺应性、单一曲率半径几何形状假体的膝关节，由于后交叉韧带中的巨大约束力，其全范围屈曲受到限制。多曲率设计（如运动型假体所示）可避免韧带不相容性。部件的低顺应性允许前后位移伴随屈曲，这提供了全范围的屈曲，并使十字韧带力接近正常膝关节的力。
该分析指出，如果在两条十字韧带均完整时使用具有高度顺应性部件的植入物，必须采取特殊预防措施以避免韧带约束力（以及潜在的松动）。在选择合适的假体设计以确保在存在一条、两条或没有十字韧带的情况下韧带相容性时，必须考虑此处呈现的将植入物几何形状与十字韧带力学相关联的信息。
