Abstract:

Introduction: Initial stability with press-fit cups can be achieved in a number of ways based on the design of the cup. With line-to-line fit, screws fixation, press-fit of 1 to 2 mm which is obtained by an oversized hemispherical cup, initial stability can be achieved with the dual-radius press-fit cups, which have an equatorial diameter 1 to 2 mm greater than that of the polar diameter, to ensure a good press-fit and to provide adequate initial stability for bone ingrowth to occur reliably.
Methods: Between January 2002 and January 2008, 400 total hip replacements (THRs) were carried out. We examined the first 150 consecutive primary THRs. In all hips, the acetabular component was the dual radius Trident ™ AD shell (Stryker Orthopaedics, Mahwah, New Jersey ).
Results: The median duration of follow-up was 6,2 yrs (range, 5 to 7 yrs). The median post-operative Harris Hip Score for 150 hips was 90.5 (range, 51 to 98). At the time of the latest follow-up, there was a bony incorporation of all components; we found no definite evidence of radiographic loosening and no signs of radiolucency.
Conclusion: According to the encouraging.

Authors:

Enrico Bonicoli, MD, Consultant Orthopedic Surgeon, 1st Department of Orthopaedic Surgery, Alessandro Baluganti, MD, Resident, 1st Department of Orthopaedic Surgery, Lorenzo Andreani, MD, Resident, 1st Department of Orthopaedic Surgery, Nicola Piolanti, MD,Resident, 1st Department of Orthopaedic Surgery, Michele Lisanti, MD, Professor of Orthopaedic Surgery and Chief, 1st Department of Orthopaedic Surgery of Pisa, University of Pisa, Italy

PMID: 23109072

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