The aim of this study is to further investigate the clinical and radiological importance of design changes in cementless hip prosthesis. The investigators have earlier evaluated the classical Furlong HAC total hip prosthesis and a first design change Furlong Active. Now a further development, Furlong Evolution, is to be evaluated. This prosthesis, furthermore, comes with and without a collar, and the investigators are going to randomize between the two. The investigators hypothesize that the new design will be easier to implant and will present equal or less migration than the older designs which would imply a favourable outcome in the long term. The investigators further hypothesize that the collar play no major part for the long term migration and bone remodelling. We will now do a 10 year follow up of the patients including RSA, DXA and PROMS
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
SINGLE
Enrollment
50
The stem has two versions, one with and one without a collar. The classical Furlong HAC had a collar.
Department of Orthopedics, Skane University Hospital, Lund University
Lund, Skåne County, Sweden
Radiostereometric Analysis (RSA)
This will measure the change in migration (translation and rotation around the x-, y-, and z-axis of the hip) over time. The migration pattern the first 2 years can predict the long term outcome.
Time frame: The first postoperative day, 14 days, 3 months, 1, 2, 5 and 10 years
Dual-energy X-ray absorptiometry (DXA)
This will measure the change in bone density around the prosthesis during the first important year. This will tell if there is a bone resorption around the stem or cup.
Time frame: 14 days postoperatively and after 1, 5 and 10 years
General health questionnaire
EuroQol (EQ-5D) - a standardized instrument for use as measure of general health outcome over time
Time frame: Preoperatively (3-4 weeks) and 1, 2, 5 and 10 years postoperatively
Hip specific health questionnaire
Hip disability and Osteoarthritis Outcome Score (HOOS) - this is a hip specific questionnaire that will measure how the operation has affected the patients function and pain situation.
Time frame: Preoperatively (3-4 weeks) and 1, 2, 5 and 10 years postoperatively
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