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RCT Comparing the DEXA Results of the HA-Omnifit Versus the Symax Uncemented Hip Stem

This study has been completed.
Stryker European Operations BV
Information provided by (Responsible Party):
Maastricht University Medical Center Identifier:
First received: September 25, 2012
Last updated: NA
Last verified: September 2012
History: No changes posted
Thr purpose of this study is to compare the clinical and radiological results, as well as the femur bone density measurements of two uncemented total hip prostheses during 5 years of follow up.

Condition Intervention Phase
Patients With Osteoarthritis of the Hip Joint Elligable for a Uncemented Hipprosthesis Procedure: uncemented total hip arthroplasty Phase 4

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single (Participant)
Primary Purpose: Treatment
Official Title: A Randomized Comparative Study to Evaluate the Performance and Confirm the Safety of the Diocom Hip Syhstem in Cementless Hip Arthroplasty

Resource links provided by NLM:

Further study details as provided by Maastricht University Medical Center:

Primary Outcome Measures:
  • short term bone remodeling [ Time Frame: 6 times within 2 years ]
    Bone remodeling is determined by measuring the Bone mineral density during time

  • complications and reoperations [ Time Frame: during 5 years ]
    Reporting all complications and reoperations of the two different hip prostheses

Secondary Outcome Measures:
  • clinical performance [ Time Frame: 9 times within 5 years ]
    Comparison of the clinical performance of the two different hip prostheses

  • Radiological evaluation [ Time Frame: 9 times within 5 years ]
    Evaluation of Xrays according to the engh classifications

Other Outcome Measures:
  • patient satisfaction [ Time Frame: 9 times within 5 years ]
    comparison of patient satisfaction between the two different prostheses

Enrollment: 50
Study Start Date: April 2003
Study Completion Date: July 2009
Primary Completion Date: July 2009 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Active Comparator: HA-Omnifit
Patients who receive a HA-Omnifit uncemented hip stem
Procedure: uncemented total hip arthroplasty
Active Comparator: Symax hip stem
Patients with the Symax uncemented hip stem
Procedure: uncemented total hip arthroplasty

Detailed Description:

It is of great importance for the function of uncemented total hip arthroplasty that the anchorage of the prosthesis in the bone of the femur is sufficient. This is of great importance in the prevention of stress shielding of the bone and to insure tranfer of forces from the prosthesis to the femur.

The symax hip stem is developed to optimize stress tranfer to bone and insure mechanical stability.

In this study the symax hip stem is compared to the HA_Omnifit hip stem (a frequently used and long term evaluated uncemented hip prosthesis) During the fist two years of follow up DEXA mesurments of bone mineral density are performed. Also patient satisfaction, patient fuction score and radiological evaluation measurements are done during 5 years of follow up.

Our primary objective is: comparison of the short term bone remodelling surrounding the Symax hip stem to the short term remodeling surrounding the Stryker Omnifit HA hip stem measured by bone densitometry, clinical and radiographic evaluation.


Ages Eligible for Study:   18 Years to 75 Years   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:Male or non pregnant female patients >18 years

  • Patient with degenerative or traumatic changes to hip requiring hip replacement
  • Patient with BMI<35
  • Patient signed informed consent

Exclusion Criteria:

  • chronic anti-inflammatory medication use> 3 months
  • revision surgery to the affected femur
  • Cancer therapy including immunosuppression, chemotherapy and radiation
  • Pathological fractures, delayed ossification or non-union is likely to occur
  Contacts and Locations
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Please refer to this study by its identifier: NCT01695213

Sponsors and Collaborators
Maastricht University Medical Center
Stryker European Operations BV
Study Director: Lodewijk van Rhijn azM
  More Information

Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Maastricht University Medical Center Identifier: NCT01695213     History of Changes
Other Study ID Numbers: Symax DEXA study
MEC 02-072 ( Other Identifier: METC MUMC Maastricht )
Study First Received: September 25, 2012
Last Updated: September 25, 2012

Keywords provided by Maastricht University Medical Center:
uncemented hip
bone remodeling
clinical evaluation

Additional relevant MeSH terms:
Osteoarthritis, Hip
Joint Diseases
Musculoskeletal Diseases
Rheumatic Diseases processed this record on September 21, 2017