One hundred twenty two hidroxyapatite-coated acetabular implants, 45 threaded
and 77 fixed with screws, were reviewed. The average follow-up period was 3.8 years. The
results have been very encouraging, obtaining 9 3% of excellent and good results with threaded
cups and 8 3% when fixed with screws. Threaded cups had better scores for avascular necrosis
(p<0.01) and primary osteoarthrosis (p<0.05). The worse results were achieved for patients
with revisions and inflamatory diseases. No evidence of loosening was found. The placement of
threaded cups was more horizontal. Male sex was associated with developing of heterotopic ossification.
There were 7% of dislocations associated with a longes distance from the teardrop
and as shorter length of the calcar from the lesser trochanter.

One hundred twenty two hidroxyapatite-coated acetabular implants, 45 threaded
and 77 fixed with screws, were reviewed. The average follow-up period was 3.8 years. The
results have been very encouraging, obtaining 9 3% of excellent and good results with threaded
cups and 8 3% when fixed with screws. Threaded cups had better scores for avascular necrosis
(p<0.01) and primary osteoarthrosis (p<0.05). The worse results were achieved for patients
with revisions and inflamatory diseases. No evidence of loosening was found. The placement of
threaded cups was more horizontal. Male sex was associated with developing of heterotopic ossification.
There were 7% of dislocations associated with a longes distance from the teardrop
and as shorter length of the calcar from the lesser trochanter.