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KMID : 0386719940060020250
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Journal of the Korean Hip Society
1994 Volume.6 No. 2 p.250 ~ p.256
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Total Hip Reploacement in the Deficient Acetabulum Using Acetabular Roof Reinforcement Ring with Hook
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Abstract
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Severe deficiency of pelvic bone stock makes it difficult to place the acetabular component in a biomechanically site of the hip and on bone of sufficient strength and quality to provide long-term fexation.
The 11 Acetabular roof reinforcement ring with hook(Protek AG. Berne, Switzerland) were placed in 9 men and 1 woman. One patient had bilateral ring.
The morsellised or wafer-shaped bone grafts were packed into bone defects. Cement is used only to secure polythylene cup to the acetabular ring, not to provide fixation of the ring and polyethylene cup to bone.
The average age at operation was 50 years. The average follow-up was 1.3 years(9months to 2 and half years).
Bone deficiencies were classified as cavitary deficiency (7 hips) and combined deficiency (4 hips) according to the AAOS clasification system.
The grafted bone appeared to be healing or incorporating in all cases as shown by radiographic remodeling and a more homogenous trbecullar appearance without significant graft resorption.
There was no loosening of the acetabular roof reinforcement ring with hook or the polyethylene sockets, nor was there material failure in the last evaluation of the hips.
Although the length of follow-up may not be sufficient, reconstruction of the acetabular bone defect with acetabular roof reinforcement ring with hook combined with autogenous or homogenous grafts is useful method especially in
extensive
cavitary deficiency and central segmental deficiency
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