Radiographic evaluation of developing instability of the Mecron cementless, threaded acetabular prostheses.
| Autor: | Seelen JL; Department of Diagnostic Radiology, Maria Hospital, Tilburg, The Netherlands., Bruijn JD, Kingma LM, Bernoski FP, Bloem JL |
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| Jazyk: | angličtina |
| Zdroj: | RoFo : Fortschritte auf dem Gebiete der Rontgenstrahlen und der Nuklearmedizin [Rofo] 1995 Sep; Vol. 163 (3), pp. 197-202. |
| DOI: | 10.1055/s-2007-1015973 |
| Abstrakt: | Purpose: To evaluate radiographically the history of the Mecron acetabular prosthesis. Material and Methods: The pelvic radiographs of 350 consecutive patients with a smooth threaded acetabular prosthesis type Mecron were retrospectively evaluated (follow-up 1 to 6 years, mean 4 years). A demarcation zone seen at the medial side of the prosthesis was graded from 0 (absent) to 3 (severe). Prostheses with grades 0 and 1 were considered stable and those with grade 3 with or without migration were presumed to be unstable. Results: At five years, 62 (62%) of the cups were unstable and only 23 (23%) were stable. The rate of migration was unacceptably high, and seen in 43 (43%) patients. Migration was only seen in prosthesis with a grade 3 demarcation. Conclusions: Demarcation visible on radiographs is an important sign of instability of the prosthesis. With the grading system it is possible to evaluate radiographically the history of the prosthesis. |
| Databáze: | MEDLINE |
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