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Migration of porous coated acetabular prostheses fixed with screws: Roentgen stereophotogrammetric analysis
Author(s) -
Kärrholm Johan,
Snorrason Finnur
Publication year - 1992
Publication title -
journal of orthopaedic research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.041
H-Index - 155
eISSN - 1554-527X
pISSN - 0736-0266
DOI - 10.1002/jor.1100100612
Subject(s) - radiodensity , prosthesis , roentgen , fixation (population genetics) , medicine , radiography , orthodontics , dentistry , surgery , nuclear medicine , population , environmental health
The fixation of screw‐fixed, porous‐coated acetabular prostheses was studied during 2 years in 21 patients (22 hips) using repeated roentgen stereophotogrammetric measurements. Migration of the center of the prostheses and/or tilting were recorded in five cups after 6 months. Two years after operation, migration was recorded in three, migration and rotation in six, and only rotation in three cups. Bone quality, prosthetic position, and immediate postoperative radiographic appearance of the prosthesis‐bone interface did not correlate with the occurrence of migration. Narrow radiolucent zones had developed in half of the patients after 2 years and was associated with proximal migration. Micromovements of screw‐fixed, press‐fit cups seem to start later compared with previously presented results from cemented acetabular prosthesis.