Albert Key (1932) described a method of amthrodesis of the tuberculous knee joint in which the cut bone surfaces were compressed against each other after excision of the joint. He had previously been impressed with the difficulty of securing bone union in this condition, but in five cases treated with compression he reported that union was achieved ‘ ‘ in an unusually short period of time. “ Hi...

Experimental determination of the elastic modulus and ultimate strength of human tibial trabecular bone as a function of metaphyseal location is presented. A 1 cm cubic matrix with planes parallel to the subchondral plate was defined on five fresh frozen cadaver tibias. Approximately 400, 7 mm X 10 mm cylindrical bone plugs were cut from the locations defined by the matrix and tested in uniaxia...

The toughness of bone is an important feature in preventing it from fracturing. We consider the notch sensitivity in impact, and the associations between brittleness, notch sensitivity and post-yield energy absorption of mammalian mineralized tissues. Specimens of bone-like tissues covering a wide range of mineralization were broken, either notched or un-notched, in impact. The greater the mine...

conclusion for the identification of nasal bone fractures, ct was significantly superior to conventional radiography. although a staff radiologist showed better values in the identification of nasal bone fracture and differentiation between depressed and non-depressed fractures than a trainee, there was no statistically significant difference in the interpretation of conventional radiography an...

The ultimate ambition of a robotic system in surgical theater has to be the safety of the involved humans means: patient, physicians, nurses. In order to provide that claim the criteria of ergonomics, redundancy, short reaction time, and accuracy must be met. In contrast to many other surgical robotic applications we are studying complex bone cut trajectories which require several distinct orie...

T change in the refractive and stain­ ing properties of bone which occurs after pressure is applied to it was first described by Dreyer1 who applied pressure to the skull? of dead Vervet monkeys by strapping elastic bands under tension around them. The refractive and staining properties of the inner and outer tables of the calvaria of untreated monkeys differ in many sections cut from these bon...

Orthopaedic surgeons use a variety of instruments to help correct, treat, and heal bone disease. The development of these instruments mirrors the history of orthopaedic surgery. The history of bonesetting, the treatment and replacement of joints, and of those who performed these techniques, appears to originate deep in antiquity. Changing ideas within medicine and surgery over the last 200 year...