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. 2007 Jun;31(3):293-6.
doi: 10.1007/s00264-006-0189-5. Epub 2006 Aug 19.

Cementless acetabular component inserted without screws - the effect of immediate weight-bearing

F Y Ng  1 , Y Zhu, K Y Chiu
Affiliations

Cementless acetabular component inserted without screws - the effect of immediate weight-bearing

F Y Ng et al. Int Orthop. 2007 Jun.

Abstract
in English, French

Seventy-four total hip arthroplasties using a cementless acetabular component without holes for supplemental screw fixation were evaluated during a follow-up period of 2-6 years. Immediate full weight-bearing walking was allowed after the operation. A comparison of anteroposterior (AP) radiographs of the pelvis taken in the early postoperative period and when the patient returned for the final follow-up revealed that there was no migration of the acetabular component. Based on the early postoperative radiographs and using the zones described by Martell et al. [J Bone Joint Surg (1993) 75-A:554-571], gaps between the acetabular component and the bone occurred at zone A2 in three hips (4.1%), at zone B1 in 12 hips (16.2%), and at zone B2 in seven hips (9.5%). The final follow-up radiographs, however, revealed only one hip to have a gap of 1.1 mm at zone B2; the majority of the gaps had disappeared. The results suggest that immediate weight-bearing walking did not result in the migration of the cementless acetabular component.

74 prothèses totales de hanche utilisant une cupule sans ciment avec vis additionnelles ont été évaluées après un suivi de 2 à 6 ans. Les patients ont été mis en charge immédiatement après l’intervention. Des radiographies de face, réalisées en post opératoire immédiat et au dernier suivi ont été réalisées pour cette étude. Nous n’avons constaté aucune migration de la cupule. Nous avons constaté en utilisant la classification de Martell et al. (1993) que de petits liserés entre la cupule et l’os présents en zone A2 dans 3 hanches (4.1%), en zone B1 dans 12 hanches (16.2%) et en zone B2 7 hanches (9.5%), sur les radiographies post opératoires immédiates ont disparu pour la grande majorité d’entre eux au recul final. Seule une hanche a montré 1 liseré résiduel de 1.1 mm en Zone B2. Ces résultats nous indiquent que la mise en charge immédiate, après la mise en place d’une cupule non cimentée avec vis additionnelles n’entraîne pas de migration du composant acétabulaire.

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Figures

Fig. 1
Fig. 1
The Duraloc 100 Polished HA acetabular component has hydroxyapatite plasma sprayed onto the porous coating. There is no screw hole and no stabilising spike or peg. The apex hole can be plugged to occlude access of polyethylene wear debris into the acetabular fixation interface
Fig. 2
Fig. 2
The lateral opening angle (A) of the acetabular component was subtended by a horizontal line touching the lowest points of the two tear drops and a line joining the superolateral and infeomedial corners of the acetabular component. The mid point of the latter line was identified, and its horizontal (H) and vertical (V) distances from the lowest point of the corresponding teardrop were measured
Fig. 3
Fig. 3
A 65-year-old patient had left THA for developmental dysplasia of the hip. Gaps (1.3 mm in thickness) were present at zones B1 and B2 in the postoperative radiograph (1 week; left); the 3-year postoperative radiograph revealed a gap (1.1 mm in thickness) at zone B2 (right). There was no change in the lateral opening angle and the horizontal and vertical positions of the acetabular component
Fig. 4
Fig. 4
A 30-year-old male patient had left THA for ankylosing spondylitis. Gaps (0.5 mm in thickness) were present at zones A2 and B1 in the first postoperative radiograph (1 week; (left); In the 5-year postoperative radiograph, the gaps were invisible (right)
See this image and copyright information in PMC

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