title: [Endoprosthesis and bone reaction].
abstract: Prosthetic implants cause a reaction on the part of the surrounding bone. Bone reaction can be interpreted as a dynamic response of the internal bone architecture to stress and strain. On the other hand, instability at the bone-implant interface or biological reactions to wear particles may lead to bone resorption. Standard X-ray examination has remained the most important tool for evaluation of the bone-implant relationship. Knowledge of the radiological features of bone remodelling and bone reaction is therefore a prerequisite for the orthopaedic surgeon. Based on eight case reports after prosthetic replacement of the hip, important radiological signs of bone reaction are presented. If possible a biomechanical or biological explanation is attempted. The information drawn from these cases, as well as from the current literature, suggests that after prosthetic joint replacement routine X-ray follow-up is required, even in asymptomatic patients, and that progressive osteolysis requires early operative revision, even if there are no acute clinical problems.
mesh_terms: D000368:Aged; D001846:Bone Development; D016723:Bone Remodeling; D001862:Bone Resorption / Q000503:physiopathology; D002648:Child; D005260:Female; D005269:Femur / Q000000981:diagnostic imaging; D006621:Hip Joint / Q000000981:diagnostic imaging; D006622:Hip Prosthesis; D006801:Humans; D007593:Joint Instability / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D016348:Osseointegration; D011859:Radiography; D012086:Reoperation; D013314:Stress, Mechanical
vernacular_title: Endoprothetik und Knochenreaktion.