Radiographic evaluation of a monoblock acetabular component: a multicenter study with 2- to 5-year results

Serial radiographs of a porous tantalum monoblock acetabular cup design were evaluated for cup stability and signs of successful osteointegration. Of 574 primary consecutive total hip replacements in 542 patients performed by 9 surgeons at 7 hospitals, 414 cases were available for minimum 2-year fol...

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Bibliographic Details
Published in:The Journal of arthroplasty 2005-04, Vol.20 (3), p.369-378
Main Authors: Gruen, Thomas A, Poggie, Robert A, Lewallen, David G, Hanssen, Arlen D, Lewis, Randall J, O'Keefe, Thomas J, Stulberg, S David, Sutherland, Charles J
Format: Article
Language:English
Subjects:
Acetabulum - diagnostic imaging
Acetabulum - injuries
Acetabulum - surgery
Biomechanical Phenomena
Coated Materials, Biocompatible
Equipment Failure Analysis
Follow-Up Studies
Fracture Healing - physiology
Fractures, Bone - diagnostic imaging
Fractures, Bone - surgery
Hip Dislocation, Congenital - surgery
Hip Prosthesis
Humans
Osseointegration - physiology
Osteoarthritis, Hip - diagnostic imaging
Osteoarthritis, Hip - surgery
Osteolysis - diagnostic imaging
Postoperative Complications - diagnostic imaging
Prosthesis Design
Radiography
Tantalum
Titanium
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Summary:Serial radiographs of a porous tantalum monoblock acetabular cup design were evaluated for cup stability and signs of successful osteointegration. Of 574 primary consecutive total hip replacements in 542 patients performed by 9 surgeons at 7 hospitals, 414 cases were available for minimum 2-year follow-up. Follow-up averaged 33 months and ranged from 24 to 58 months. Postoperative radiographs revealed acetabular gaps in 100 zones in 80 (19%) hips: 29 in zone I, 67 in zone II, and 4 in zone III. At last follow-up, 84 (84%) of the zones with gaps completely filled in, and all 4- and 5-mm gaps filled in. There was no progression of any postoperative gap, no evidence of continuous periacetabular interface radiolucencies, no evidence of lysis, and no revisions for loosening. Although these short-term results are encouraging, further follow-up will be required to assess whether the monoblock design and the low modulus of elasticity of porous tantalum will reduce the incidence of periacetabular stress shielding and occurrence of osteolysis.
ISSN:0883-5403
DOI:10.1016/j.arth.2004.12.049