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. 2006 Apr;30(2):84-90.
doi: 10.1007/s00264-005-0065-8. Epub 2006 Feb 28.

Ten-year follow-up of an anatomical hydroxyapatite-coated total hip prosthesis

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Ten-year follow-up of an anatomical hydroxyapatite-coated total hip prosthesis

V Canales Cortés et al. Int Orthop. 2006 Apr.

Abstract

We report our results after ten year follow-up of 107 consecutive ABG-I hip prostheses implanted between June 1990 and December 1992: Only 84 prostheses were still in the study after ten years, but only six patients had undergone surgical revision. We can consider our clinical outcomes as excellent, with a whole-implant survival rate greater than 96%, a mean Merle D'Aubigne and Postel score increasing from 7.97 before operation to 16.17 at ten year follow-up, and a personal subjective assessment as excellent or good in 82.14% of patients. However, radiographic outcomes are more worrying: around 90% of patients show a stress-shielding phenomenon and granulomatous lesions in the proximal femur, and more than 82% suffer polyethylene wear greater than one millimetre (mean 1.68 mm). We think that zirconia stem heads and hooded antiluxation PE inserts are determining factors in the process of PE wear and, secondarily, in cancellous bone resorption and bone osteolysis.

Nous rapportons les résultats, après dix ans de suivi, de 107 prothèses de hanche de type ABG-1, implantées entre juin 1990 et décembre 1992. Seulement 84 patients étaient toujours suivis, mais seulement 6 avaient eu une reprise chirurgicale. Nous considérons les résultats cliniques comme excellents avec une survie des implants de plus de 96%, un score de Merle d’Aubigné augmenté de 7,97 à 16,17 à dix ans et une appréciation subjective des patients bonne ou excellente dans 82,14% des cas. Cependant l’évolution radiologique est préoccupante : prés de 90% des patients montrent des phénomènes de stress shielding et des lésions granulomateuses du fémur proximal, et plus de 82% ont une usure du PE de plus de 1 mm (moyenne : 1,68). Nous pensons que la tête en Zircone et le rebord anti-luxation des inserts en PE sont déterminants dans l’usure et secondairement dans l’ostéolyse.

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Figures

Fig. 1
Fig. 1
Cancellous bone growth around acetabular cup at 1- and 10-year follow-up
Fig. 2
Fig. 2
Bone resorption around the acetabular cup at 1- and 10-year follow-up
Fig. 3
Fig. 3
Granulomatous lesions around the acetabular cup at 1- and 10-year follow-up
Fig. 4
Fig. 4
a Cancellous bone growth at 1- and 10-year follow-up: AP view. b Cancellous bone growth at 1- and 10-year follow-up: lateral view
Fig. 5
Fig. 5
a Bone resorption around the femoral stem: AP view. b Bone resorption around the femoral stem: lateral view

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