Abstract
Introduction and purpose: The ARC-2F cup used in this study is made of a rough titanium alloy with HA coating. It is a hemispherical cup fixed by means of a thread and screws. The study analyzes the cup’s long term clinical and radiological performance.
Materials and methods: 51 cups were studied in 49 patients. Mean follow-up was 9 years and 10 months (min. 7– max. 13). The patients’ mean age was 62.2 years, 27 were female and 22 were male. The preop diagnosis was: cup movement in 25 uncemented cups and 16 cemented ones; 8 cups with partial protrusions and 2 infections. 19.6% had segmentary bone defects, 37.3% had cavitary bone defects and 43.1% had a combination of the two, according to the AAOS classification. An autologous graft (either freeze-dried or of bank origin) was used in 72.5% of cases. Use was made of the Johnston et al. clinical and radiological protocol and of Merle D’Aubigne’s score.
Results: 76.5% of patients had no pain, 60.8% of results were excellent, 29.4% good, 7.8% fair and 2% poor. A total of 50 cups were osseointegrated; there had been two migrations in the first three months and 1 cup had moved, but no cups had to be re-revised. The number of radiolucent lines was maximal in the V zone (5.9%) – this includes the displaced cup. As regards complications, there were three dislocations and 5.9% of patients presented with pelvic osteolysis.
Conclusions: Use of the ARC-2F cup leads to excellent results in revision surgery since it is conducive to good primary fixation and a degree of osseointegration with is not lost in the long-term.
The abstracts were prepared by Dr. E. Carlos Rodríguez-Merchán, Editor-in-Chief of the Spanish Journal of Orthopaedics and Traumatology (Revista de Ortopedia y Traumatología). Correspondence should be sent to him at Sociedad Española de Cirugía Ortopédica y Traumatología (SECOT), Calle Fernández de los Ríos, 108, 28015-Madrid, Spain
