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Browsing by Author "Fonseca, RL"

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  • Favorable outcome of total hip arthroplasty with insufficient bone coverage of the roof reinforcement ring
    Publication . Judas, F; Lucas, F; Fonseca, RL
    INTRODUCTION: Total hip arthroplasty in patients with developmental dysplasia of the hip can be a complex procedure due to acetabular and proximal femoral deformities. PRESENTATION OF CASE: A 59-year-old male patient underwent a total hip arthroplasty for the treatment of end-stage dysplastic osteoarthritis. A roof reinforcement ring, a cemented polyethylene cup, and a cementless stem were used. A portion of the superior rim of the ring was uncovered by the host bone. Morsellized autogenous femoral-head graft was impacted to fill the space between the superior rim of the ring and the superior part of the dysplastic acetabulum. At the follow-up after 5-years, the patient had no complaints and was very satisfied with the operation result. The hip radiograph revealed no signs of instability of the acetabular component, and no bone graft resorption. DISCUSSION: Favorable results were described using metal rings and conical femoral stems for the treatment of the developmental dysplasia of the hip. The superior rim of the metal ring should be against host bone for 60% of its support. Despite the suboptimal implantation of the ring compromising, apparently, mechanical stability of the arthroplasty, the outcome was favorable. CONCLUSION: This result can be supported by the good fixation of the metal ring to the pelvis with screws, the adequate orientation of both components of the total hip arthroplasty, and the bone graft incorporation.
    2015Journal article Open access Show more
  • A technique to remove a stable all-polyethylene cemented acetabular liner in revision hip arthroplasty: A case report
    Publication . Judas, F; Lucas, FM; Fonseca, RL
    INTRODUCTION: The removal of a well-fixed acetabular component in a total hip arthroplasty can cause bone fractures, excessive bleeding, as well as extended bone loss. The reimplantation of a new acetabular component may be compromised. PRESENTATION OF CASE:We report a technique using 2 cork-screws for removal a stable cemented acetabular component for the treatment of a recurrent dislocation of a cemented total hip arthroplasty, due to acetabular malposition. DISCUSSION: A diversity of approaches and tools has been used for extraction ofthe acetabular prosthesis. Using 2 cork-screws it is possible to create fissures and fractures into the cement mantle, and greater manual control is obtained facilitating the manipulation of the acetabular component in different directions. The cup-cemented bond can be disrupted, the host bone is preserved and the risks of complications are minimized. CONCLUSION: This technique is simple, available in any environment, reproducible, non-costly, nontiming consuming and safe.
    2015Journal article Open access Show more