Abstract
We assessed the clinical and radiographic results of 40 porous-coated acetabular cups with an Acetabular Cup System polyethylene liner over a minimum 14-year follow-up. Femoral head penetration was estimated using a software package. Fifteen cups were revised, 11 due to polyethylene liner rupture. All cups but two were radiographically stable, and 11 hips showed acetabular osteolysis. The overall femoral head penetration rate in hips without liner fracture with reference to the early penetration point was 0.1188±0.070 mm per year. Polyethylene liner fractures were associated with higher early femoral head penetration (P<0.0001) and a vertical cup position (P=0.0016). The 14-year survival without cup revision for any reason was 63.9%, 71.8% with no ACS polyethylene liner fracture and 65.3% with no acetabular osteolysis. Most cups showed a good clinical outcome in general, but major Acetabular Cup System liner failure and osteolysis were frequent. Patients with the ACS cups still in place should be monitored closely.
Résumé
Nous présentons les résultats de 40 cupules acétabulaires à revêtement poreux avec un noyau en polyéthylène « Acetabular Cup System » (ACS), à un recul minimum de 14 ans. La pénétration de la tête fémorale était estimée par un logiciel particulier. Quinze cupules étaient révisées dont 11 à cause d’une rupture du polyéthylène. Toutes les cupules sauf 2 étaient radiologiquement stable et 11 hanches montraient une ostéolyse acétabulaire. La vitesse de pénétration de la tête dans les cupules sans rupture était de 0,1188±0,070 mm par an. Les ruptures du polyéthylène étaient en rapport avec une importante pénétration précoce (P<0,0001) et une position verticale de la cupule (P=0,0016). La survie sans révision à 14 ans était de 63,9%, sans rupture du PE de 71,8% et sans ostéolyse de 65,3%. La plupart des cupules avaient une bonne évolution clinique mais la faillite du noyau en polyéthylène et l’ostéolyse étaient fréquentes. Les patients porteurs de cupule ACS doivent être suivis minutieusement.
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Garcia-Rey, E., Garcia-Cimbrelo, E. Long-term results of uncemented acetabular cups with an ACS polyethylene liner. A 14–16-year follow-up study. International Orthopaedics (SICOT) 31, 205–210 (2007). https://doi.org/10.1007/s00264-006-0151-6
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DOI: https://doi.org/10.1007/s00264-006-0151-6