We found moderate to strong evidence that no adverse effects on subsidence and osseous integration of the femoral stem after uncemented THA occur after immediate UWB .
The aim of this systematic review was to find evidence -based support in the literature to allow immediate unrestricted weight bearing after  primary uncemented total hip arthroplasty ( THA ) .
Accelerated rehabilitation programs for THA are becoming increasingly popular to shorten hospital stay and to facilitate rapid restoration of function .
The goals of these rehabilitation programs could be more easily achieved if immediate unrestricted weight bearing ( UWB ) could be allowed after a THA .
So far , however , immediate weight bearing is frequently contraindicated in widely accepted protocol s for uncemented THA due to fear for subsidence and absence of osseous integration of the femoral stem .
Thus , frequently protected weight bearing and restricted activities are still advocated for at least 6 weeks after surgery .
In addition , we analyzed the literature to come to a recommendation on gait pattern and walking aid .
The effect of early weight bearing on migration pattern of the uncemented CLS stem in total hip arthroplasty.
Forty-two patients ( younger than 65 years ) with osteoarthritis were operated on with an uncemented CLS stem and r and omized to early unrestricted weight bearing combined with intensive physiotherapy or to partial weight bearing combined with self-training . Radiostereometric analysis showed 1.2 ( + 0.11 to -6.76 ) mm subsidence of the stem at 24 months in both groups . There was no significant difference in the migration pattern between the unrestricted and partial weight bearing groups . Actual loading on the operated leg , measured with the F-scan system , did not influence the migration of the stem . There was a strong correlation between the average subsidence at 3 and 24 months ( r = 0.96 ) . Early full weight bearing and active rehabilitation can be used for the uncemented CLS stem without increased risk of early loosening
We found moderate to strong evidence that no adverse effects on subsidence and osseous integration of the femoral stem after uncemented THA occur after immediate UWB .
The aim of this systematic review was to find evidence -based support in the literature to allow immediate unrestricted weight bearing after  primary uncemented total hip arthroplasty ( THA ) .
Accelerated rehabilitation programs for THA are becoming increasingly popular to shorten hospital stay and to facilitate rapid restoration of function .
The goals of these rehabilitation programs could be more easily achieved if immediate unrestricted weight bearing ( UWB ) could be allowed after a THA .
So far , however , immediate weight bearing is frequently contraindicated in widely accepted protocol s for uncemented THA due to fear for subsidence and absence of osseous integration of the femoral stem .
Thus , frequently protected weight bearing and restricted activities are still advocated for at least 6 weeks after surgery .
In addition , we analyzed the literature to come to a recommendation on gait pattern and walking aid .