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 inpatient rehabilitation after elective hip and knee arthroplasty.
CONTEXT Inpatient rehabilitation after elective hip and knee arthroplasty is often necessary for patients who can not function at home soon after surgery , but how soon after surgery inpatient rehabilitation can be initiated has not been studied . OBJECTIVE To test the hypothesis that high-risk patients undergoing elective hip and knee arthroplasty  would incur less total cost and experience more rapid functional improvement if inpatient rehabilitation began on postoperative day 3 rather than day 7 , without adverse consequences to the patients . DESIGN R and omized controlled trial conducted from 1994 to 1996 . SETTING Tertiary care center . PARTICIPANTS A total of 86 patients undergoing elective hip or knee arthroplasty and who met the following criteria for being high risk : 70 years of age or older and living alone , 70 years of age or older with 2 or more comorbid conditions , or any age with 3 or more comorbid conditions . Of the 86 patients , 71 completed the study . INTERVENTIONS R and om assignment to begin inpatient rehabilitation on postoperative day 3 vs postoperative day 7 . MAIN OUTCOME MEASURES Total length of stay and cost from orthopedic and rehabilitation hospital admissions , functional performance in hospitals using a subset of the functional independence measure , and 4-month follow-up assessment using the R AND 36-item health survey I and the functional status index . RESULTS Patients who completed the study and began inpatient rehabilitation on postoperative day 3 exhibited shorter mean ( + /-SD ) total length of stay ( 11.7+/-2.3 days vs 14.5+/-1.9 , P<.001 ) , lower mean ( + /-SD ) total cost ( $ 25891+/-$3648 vs $ 27762+/-$3626 , P<.03 ) , more rapid attainment of short-term functional milestones between days 6 and 10 ( 36.2+/-14.4 m ambulated vs 21.4+/-13.3 m , P<.001 ; 4.8+/-0.8 mean transfer functional independence measure score vs 4.3+/-0.7 , P<.01 ) , and equivalent functional outcome at 4-month follow-up . CONCLUSION These data showed that high-risk individuals were able to tolerate early intensive rehabilitation , and this intervention yielded faster attainment of short-term functional milestones in fewer days using less total cost
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 .