[Theoretical principles of the cement-free prosthetic technic].
For long-term cementless fixation of prostheses compression stress transfer between bone and prosthesis is desirable. Shear stress and relative movement between implant and bone lead to bone resorption and implant loosening. A compression stress can be achieved by a suitable force transmission, a form-closed press fit and a suitable prosthesis surface. A ripped, rough or porous surface can transfer shear and tensile stress into compression stress at the interface. A force locking anchorage of the prosthesis can produce a prestressed fixation which supports the growing of the bone into the prosthesis surface. Stiff prostheses lead to a stronger stress protection and atrophy of the bone which favors the fatigue fracture of bone trabeculae.
Abteilung für Unfallchirurgie, Hand-, Plastische- und Wiederherstellungschirurgie Universität Ulm.
L
L
Claes
D001696:Biomechanical Phenomena; D001843:Bone Cements / Q000008:administration & dosage*; D006622:Hip Prosthesis; D006801:Humans; D011183:Postoperative Complications / Q000209:etiology; D011474:Prosthesis Design; D011475:Prosthesis Failure
D001843:Bone Cements
Theoretische Grundlagen der zementfreien Prothesentechnik.