Weber U, Hoschek J
Arch Orthop Trauma Surg (1978). 1979 Oct;95(1-2):95-104. doi: 10.1007/BF00379176.
The motility of a healthy hip joint normally seems to be better than the motility of an endoprosthesis. The movement of all models of endoprostheses must fulfill minimum requirements as well in total motility as in each way. The arithmetical investigation of the motility of commercial total endoprostheses shows good locomotion for most cases. Decisive is the relation between prosthesis head- and prosthesis neck diameter. Insufficient motility of endoprosthetic models results if especial--redundant--constructive details of the socket are selected. It seems to be more problematical to produce double cup endoprostheses which reveal sufficient function. Normally the motility of double cup prostheses must be essentially less than that of total endoprostheses or of a healthy hip joint. A special implant technique and various constructive assumptions are necessary to reach a sufficient functional result.
健康髋关节的活动度通常似乎优于人工关节的活动度。所有型号的人工关节的运动在总体活动度以及各个方面都必须满足最低要求。对市售全髋关节假体活动度的算术研究表明，大多数情况下其运动良好。关键在于假体头直径与假体颈直径之间的关系。如果选择了髋臼的特殊——多余的——结构细节，人工关节模型的活动度就会不足。制造具有足够功能的双杯髋关节假体似乎更成问题。通常，双杯假体的活动度必须明显小于全髋关节假体或健康髋关节的活动度。要获得足够的功能效果，需要特殊的植入技术和各种结构设想。
