Table 8. Summary of registry study's findings.

Study	Outcome
Hailer et al. 2010	Uncemented THA had a higher risk of revision for any reason. Uncemented cup had a higher risk of cup revision due to aseptic loosening. Uncemented stem had a lower risk of stem revision due to aseptic loosening. No significant difference in the risk of revision due to infection between cemented and uncemented THA.
Weiss et al. 2011	Survival was better for the cemented stems with up to 3 years of follow-up. Decreasing age, multiple previous revisions, short stem length, standard neck offset and short head-neck length were risk factors for reoperation.
Mäkelä et al. 2010	Cementless stem had a higher survival rate at 15 years in patients aged >55 years. Polyethylene wear and osteolysis remain a serious problem for cementless cup designs with unplugged screw holes and low-quality liners.
Bordini et al. 2007	Cemented cups and stems have a higher risk of failure compared with uncemented ones. Worst survival of the prosthesis are associated with male patients, younger than 40 years, affected by sequelae of congenital diseases, operated by a surgeon who performed less than 400 total hip artroplasty.
NJR 2011	Revision rate for uncemented THRs is twice that of the cemented THRs at five years. The rate for hybrid THRs tends to lie between the rates for cemented and uncemented THRs.
Hooper et al. 2009	Fully-cemented THRs had a lower rate of revision while uncemented THRs had a lower rate <65 years. The rate of revision of the acetabular component was less in the uncemented and hybrid groups. The rate of revision of cemented and uncemented femoral components was similar, except in patients >75 years of age in whom revision of cemented femoral components was significantly less frequent. Revision for infection was more common in patients aged <65 years and in cemented and hybrid THRs. Dislocation was the most common cause of revision for all types of fixation and was more frequent in both uncemented acetabular groups. The experience of the surgeon did not affect the findings.