High long-term loosening rate of conical screw cups
| Autor: | Christian Hendrich, Derya Ak, Ulf Sauer, Stephan Kirschner, Helge Schmitz, John M Martell |
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| Rok vydání: | 2007 |
| Předmět: |
Adult
Male medicine.medical_specialty Chirurgie orthopedique Arthroplasty Replacement Hip Bone Screws Dentistry Prosthesis Design Osseointegration Medicine Humans Orthopedics and Sports Medicine Prospective Studies Survival rate Titanium business.industry Acetabulum General Medicine Middle Aged equipment and supplies Surgery Prosthesis Failure Orthopedic surgery Female Implant Hip Prosthesis business Follow-Up Studies |
| Zdroj: | Acta orthopaedica. 77(6) |
| ISSN: | 1745-3674 |
| Popis: | Background Acetabular screw cups seem to give high primary stability. We analyzed the migration and loosening behavior of a first-generation screw cup in a longterm follow-up.Patients and methods We examined 92 uncemented titanium alloy conical screw cups prospectively. Implant migration was assessed with a digital high-precision method (EBRA) with an accuracy of 1.0 mm.Results After mean 11 (0.5–18) years, 87 patients were available for examination and 5 patients had died. 32 implants had been revised and 7 cases showed radiographic evidence of loosening. The 10-year survival rate was 71%. Migration of more than 1 mm occurred in 53 hips. Implant survival was strongly associated with an annual migration of greater than 0.2 mm.Interpretation The long-term behavior of this cup is not satisfactory. In spite of extraordinarily high primary implant stability, secondary osseointegration of this cup often fails. The annual migration rate represents a valid parameter for prediction of implant survival. |
| Databáze: | OpenAIRE |
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