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Protective rings are a valuable adjunct in revision acetabular surgery. Two types of rings are used. The roof ring, which is the smaller of the 2 rings, provides support from the ilium to the inferomedial part of the acetabulum. The reconstructive ring or cage provides support from the ilium to the ischium. Both devices can be used to protect morcellized or structural bone–graft. The roof ring can...
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