title: [Bony changes at the femur side after hip joint replacement: radiologic analysis of 80 hip joints].
abstract: The authors, according to Amstutz, studied the roentgenographs of 80 postoperation cases of cemented hip joint replacement performed more than two years-ago. There were bone changes in 64 cases (80%), of them, sclerosis of bone in 32 cases (40%), atrophy of bone in 25 cases (31%), absorption of bone in 24 cases (30%), thickness of bone cortex in 18 cases (22%), enlargement of medullary cavity in 12 cases (15%), periosteum reaction in 8 cases (10%), and thinness of bone cortex in 1 case (1.3%). Most of them usually occurred in the sixth month to the second year post-operation and located mainly at the 1, 4, 5 and 7 regions. The authors think that the most important cause is the unbalance of biologic stress, and other factors are elasticity and hardness of prosthesis, frictional force, cemented of the stem, etc.
authors.affiliation: First Teaching Hospital, Beijing Medical University.
authors.forename: L C
authors.initials: LC
authors.lastname: Wen
authors.forename: Z T
authors.initials: ZT
authors.lastname: Ma
mesh_terms: D000328:Adult; D000368:Aged; D001284:Atrophy / Q000209:etiology; D001862:Bone Resorption / Q000209:etiology; D005260:Female; D005265:Femoral Neck Fractures / Q000601:surgery; D005269:Femur / Q000000981:diagnostic imaging / Q000473:pathology*; D006621:Hip Joint / Q000000981:diagnostic imaging*; D006622:Hip Prosthesis / Q000009:adverse effects*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010026:Osteosclerosis / Q000209:etiology; D011859:Radiography