Osteoarthrosis Clinical Trial
Official title:
A Comparison of Two Total Hip Replacements: Hip Resurfacing System Versus Mallory-Head/Exeter
The purpose of this study is to compare two total hip replacement systems: Hip Resurfacing System (ReCap) versus Mallory-Head/Exeter.
In Denmark approximately 7000 primary hip replacements are implanted yearly, and the
incidence is rising with the increasingly aging population. For older patients, the
incidence of later revisions of hip implantation is low. Unfortunately, this is not true for
younger patients. Approximately 20% of patients under 55 years of age at the time of surgery
must have the hip implant renewed within 10 years.
This is primarily because of the wear generated by polyethylene debris. The polyethylene is
associated with osteolysis in the proximity of the prosthesis leading to failure of the
prosthesis.
This unsatisfactory result has led to the development of an alternative hip prosthesis
especially to benefit younger and physically active people. The new prosthesis should
produce less inflammatory debris and less osteolysis induced failure.
To avoid the polyethylene particles, a new type of prosthesis has been made articulating
metal on metal. The Hip Resurfacing System consists of an alloy of chrome - cobalt -
molybdenum. Another point of interest for this prosthesis is also the size of the
articulating surfaces which are bigger than usual. This will theoretically participate in
the generation of metal ions.
Study objectives:
- This randomised prospective study will investigate the emission of Co-, Cr- and Mb-ions
from Hip Resurfacing System and Mallory-Head/Exeter implants, respectively. The
emission is measured as the ion concentration in the urine and is correlated to the
inflammatory response in fasting plasma before and after the operation.
- To assess the walking pattern postoperatively using a 3D gait analysis, Vicon Polygon.
- To assess the postoperative recovery using the Harris hip score and visual analogue
scale.
- The migration of acetabular 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, 24 months,
and 5 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.
;
Allocation: Randomized, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Parallel Assignment, Masking: Single Blind (Outcomes Assessor), Primary Purpose: Treatment
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