Polyethylene wear debris from metal-on-polyethylene articulations are one of the main causes of periprosthetic bone loss and non-infectious loosening in total hip arthroplasty. Ceramic articulations have a very low wear rate when measured in the laboratory and the investigator's hypothesis is that hip arthroplasty with an all ceramic articulation will have less osteolysis and wear in addition to equally good fixation and clinical outcome compared to the same hip arthroplasty design with a metal-on-polyethylene joint.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
SINGLE
Enrollment
104
Osteolysis frequency change between 7 and 15 years
Osteolysis frequency (%) measured with computed tomography,
Time frame: Change between 7 to 15 years after surgery
Osteolysis size change between 7 and 15 years
Osteolysis size (cm3) measured with computed tomography
Time frame: Change between 7 and 15 years after surgery
Articulation wear at 7 years
Articulation wear as measured with radiostereometry, mm/year
Time frame: At 7 years after surgery
Articulation wear at 15 years
Articulation wear as measured with radiostereometry, mm/year
Time frame: 15 years after surgery
Implant fixation at 7 years
Stem and cup translation (mm/year) and rotation (degrees/year) measured with radiostereometry
Time frame: 7 years after surgery
Implant fixation at 15 years
Stem and cup translation (mm/year) and rotation (degrees/year) measured with radiostereometry
Time frame: At 15 years after surgery
Clinical function at 7 years
Harris Hip Score (0-100)
Time frame: 7 years after surgery
Clinical function at 15 years
Harris Hip Score (0-100)
Time frame: 15 years after surgery
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