Daniels A U, Samuelson K M, Rusin K A
Foot Ankle. 1981 Jul;2(1):5-14. doi: 10.1177/107110078100200102.
The curvature and extent of a joint surface largely determine the type and range of motion possible. The talonavicular surface anatomy of 10 human foot specimens has been determined quantitatively, and the data have been compared with the design parameters for a prototype prosthetic joint. It was found that, in general, the natural talus as compared with the navicular was slightly larger in surface area and in mean arc length, but slightly smaller in mean radius of curvature. The arc length of the joint was found to be generally slightly longer along an axis positioned from slightly medial of dorsal to slightly lateral of ventral. In contrast, no general orientation of the radius of curvature was observed. Also, it was found that the congruency between the talus and navicular surfaces, as indicated by corresponding radii of curvature, varied widely. In comparison to the human specimens, a previously designed prototype talonavicular prosthesis proved somewhat smaller in radius, arc length, and surface area. Experimental studies related to other prosthesis design parameters, besides type and range of motion, are in progress.
关节面的曲率和范围在很大程度上决定了可能的运动类型和范围。已对10例人类足部标本的距舟关节面解剖结构进行了定量测定，并将数据与一种原型人工关节的设计参数进行了比较。结果发现，一般而言，与舟骨相比，天然距骨的表面积和平均弧长略大，但平均曲率半径略小。发现关节的弧长沿从背侧略内侧到腹侧略外侧定位的轴通常略长。相比之下，未观察到曲率半径的一般取向。此外，发现距骨和舟骨表面之间的一致性（由相应的曲率半径表示）差异很大。与人类标本相比，先前设计的原型距舟假体在半径、弧长和表面积方面略小。除了运动类型和范围之外，与其他假体设计参数相关的实验研究正在进行中。
