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A Comparison of Two Metal Surface Finishes on Femoral Components in Hip Arthroplasty

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00116038
Recruitment Status : Completed
First Posted : June 27, 2005
Last Update Posted : July 7, 2009
Kolding Sygehus
Aarhus University Hospital
Zimmer Biomet
Information provided by:
University of Aarhus

Brief Summary:
The purpose of this study is to compare metal surface finishes (proximal-coated titanium surface versus mid-coated titanium surface) on femoral components in hip arthroplasty.

Condition or disease Intervention/treatment Phase
Osteoarthritis Device: Femoral implant (Versys Fiber Metal Taper®) Not Applicable

Detailed Description:

In younger patients femoral components are most often implanted without the use of cement. A direct ingrowth of bone to the implant is crucial to the attainment of good results in those cases where cement is not employed.

The construction of a femoral implant, Versys Fiber Metal Taper®, by Zimmer includes a more extensive coating than previous femoral implants. The improved surface coating has been shown to provide these implants with better properties than those demonstrated by implants currently in general use.

Theoretically, the greater porous surface of mid-coated implants should:

  • Encourage bone ingrowth through improved osteoconductive properties, however more extensive coating might change the loss of bone due to stress shielding later in time
  • Improve anchorage of the implant due to the higher friction coefficient
  • Result in fewer postoperative complaints measured with the Harris Hip Score and visual analog scale scores

The migration of femoral components will be evaluated by RSA, performing radiostereometric analyses at the Orthopaedic Center, Aarhus University Hospital. The follow-up RSA will be scheduled for week 1, as well as 3 months, 12 months and 2 years after surgery. Bone mineral density around the implanted femoral component will be examined by DEXA scan at week 1, as well as 1 year and 2 years after surgery.

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Study Type : Interventional  (Clinical Trial)
Enrollment : 50 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double
Primary Purpose: Treatment
Official Title: A Comparison of Two Metal Surface Finishes (Proximal-Coated Titanium Surface Versus Mid-Coated Titanium Surface) on Femoral Components in Hip Arthroplasty
Study Start Date : January 2004
Actual Primary Completion Date : January 2007
Actual Study Completion Date : January 2007

Resource links provided by the National Library of Medicine

Primary Outcome Measures :
  1. migration of femoral components evaluated by RSA

Secondary Outcome Measures :
  1. BMD in the surrounding bone tissue of femoral components

Information from the National Library of Medicine

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Ages Eligible for Study:   50 Years to 70 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Patients with primary arthritis in the hip.
  • Patients with sufficient bone density to allow uncemented implantation of a femoral component.
  • Informed patient consent in writing.

Exclusion Criteria:

  • Patients with neuromuscular or vascular disease in the affected leg.
  • Patients found upon operation to be unsuited for uncemented acetabulum component.
  • Patients who regularly take non-steroid anti-inflammatory drugs (NSAID) and cannot interrupt intake for the postoperative phase of the study.
  • Patients with fracture sequelae.
  • Female patients of childbearing capacity.
  • Hip joint dysplasia.
  • Sequelae to previous hip joint disorder in childhood.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00116038

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Orthopaedic Center, Aarhus University Hospital,
Aarhus, Denmark, 8000
Sponsors and Collaborators
University of Aarhus
Kolding Sygehus
Aarhus University Hospital
Zimmer Biomet
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Principal Investigator: Kjeld Søballe, MD., Prof. Orthopaedic Center, Aarhus University Hospital, Aarhus, Denmark
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Responsible Party: Professor Kjeld Soballe, Aarhus University Hospital, Tage-Hansens Gade 2, 8000 Aarhus C Identifier: NCT00116038    
Other Study ID Numbers: 20030192
First Posted: June 27, 2005    Key Record Dates
Last Update Posted: July 7, 2009
Last Verified: July 2009
Keywords provided by University of Aarhus:
Hip arthroplasty
Additional relevant MeSH terms:
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Joint Diseases
Musculoskeletal Diseases
Rheumatic Diseases