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 .
Early Migration Pattern of the Uncemented CLS Stem in Total Hip Arthroplasties
We performed this investigation to determine the possible migration starting immediately after surgery and the effect of different weightbearing regimens on the migration pattern of an uncemented hip stem ( CLS ) . Stem migration was determined with radiostereometry analysis with baseline when the patients still were anesthetized . Subsequent examinations were done up to 1 year . Twenty-nine patients ( mean age , 55 years ; range , 26 - 63 years ) were r and omized to either unrestricted weightbearing combined with intensive physiotherapy  from the first day after surgery or to partial weightbearing and a conservative training regimen for the first 3 months after surgery . At 1 week , subsidence was −0.03 mm in the unrestricted weightbearing group and 0.01 mm in the partial weightbearing group . At 1 year , subsidence was 1.01 mm in the unrestricted weightbearing group and 0.51 mm in the partial weightbearing group . One patient in the unrestricted weightbearing group had revision surgery because of aseptic loosening at 1.5 years after surgery . The CLS stem did not have any migration from the end the surgery until 1 week , but there was small migration from 1 week to 3 months after which the stem remained stable . The degree of early weightbearing did not affect the migration pattern . Level of Evidence : Level I , therapeutic study ( r and omized study ) . See the Guidelines for Authors for a complete description of levels of evidence
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 .