[Stress on the normal and pathologic wrist joint].
The wrist joint is generally stressed by external forces. The resultant of these external forces produces the pressure in the joint which evokes pressure stresses within the supporting tissues of the joint. As was shown by Pauwels (1973) the density of the subchondral bone is adapted to articular stress distribution. The zone of subchondral bone can be seen as the morphological equivalent of the specific joint stress. This paper shows by means of density analyses and pressure measurements that in contrast to earlier opinions joint pressure is transmitted both by the lunate and the scaphoid bones. It seems that the physiological stress is even higher in the scaphoid than in the lunate bone. The force transmission between the lunate and the ulnar disc is less pronounced. The analysis of the lunatal trabecular architecture leads to the suggestion that the lunate is stressed differentially in the radio-ulnar plane. In pathological conditions of the wrist joint (perforation of the disc, ulnar shift, Kienböck's disease, ulna minus variant) the pressure and the density distribution are adapted to the pathomorphology in each case.
Koebke
J
J
Anatomischen Institut der Universität zu Köln.
Fehrmann
P
P
Mockenhaupt
J
J
D000368:Aged; D000369:Aged, 80 and over; D001696:Biomechanical Phenomena; D002348:Carpal Bones / Q000503:physiopathology*; D005260:Female; D006801:Humans; D007592:Joint Diseases / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D010007:Osteochondritis / Q000503:physiopathology; D010026:Osteosclerosis / Q000503:physiopathology; D014457:Ulna / Q000503:physiopathology; D014954:Wrist Injuries / Q000503:physiopathology; D014955:Wrist Joint / Q000503:physiopathology*
Zur Beanspruchung des normalen und des pathologischen Handgelenks.