Our results suggest that compared with CS , SS may provide superior bone remodelling and similar survival rates and clinical outcomes .
However , the short-term follow-up of the included studies was inadequate to determine the long-term performance of SS
OBJECTIVE Cementless total hip arthroplasty (  THA ) is associated with reliable clinical results and high patient satisfaction .
Short-stem prostheses ( SS ) were design ed to achieve superior preservation of proximal bone stock and stability compared with those of conventional-stem prostheses ( CS ) .
This meta- analysis was conducted to determine the proximal bone remodelling , revision rate , Harris Hip Score , radiolucent line and maximum total point motion values of both SS and CS for primary THA .
Lower periprosthetic bone loss and good fixation of an ultra-short stem compared to a conventional stem in uncemented total hip arthroplasty
Background and purpose — We hypothesized that an ultra-short stem would load the proximal femur in a more physiological way and could therefore reduce the adaptive periprosthetic bone loss known as stress shielding . Patients and methods — 51 patients with primary hip osteoarthritis were r and omized to total hip arthroplasty ( THA ) with either an ultra-short stem or a conventional tapered stem . The primary endpoint was change in periprosthetic bone mineral density ( BMD ) , measured with dual-energy x-ray absorptiometry ( DXA ) , in Gruen zones 1 and 7 , two years after surgery . Secondary endpoints were change in periprosthetic BMD in the entire periprosthetic region , i.e. Gruen zones 1 through 7 , stem migration measured with radiostereometric analysis ( RSA ) , and function measured with self-administered functional scores . Results — The periprosthetic decrease in BMD was statistically significantly lower with the ultra-short stem . In Gruen zone 1 , the mean difference was 18 % ( 95 % CI : −27 % to −10 % ) . In zone 7 , the difference was 5 % ( CI : −12 % to −3 % ) and for Gruen zones 1–7 the difference was also 5 % ( CI : −9 % to −2 % ) . During the first 6 weeks postoperatively , the ultra-short stems  migrated 0.77 mm more on average than the conventional stems . 3 months after surgery , no further migration was seen . The functional scores improved during the study and were similar in the 2 groups . Interpretation — Up to 2 years after total hip arthroplasty , compared to the conventional tapered stem the ultra-short uncemented anatomical stem induced lower periprosthetic bone loss and had equally excellent stem fixation and clinical outcome
Our results suggest that compared with CS , SS may provide superior bone remodelling and similar survival rates and clinical outcomes .
However , the short-term follow-up of the included studies was inadequate to determine the long-term performance of SS
OBJECTIVE Cementless total hip arthroplasty (  THA ) is associated with reliable clinical results and high patient satisfaction .
Short-stem prostheses ( SS ) were design ed to achieve superior preservation of proximal bone stock and stability compared with those of conventional-stem prostheses ( CS ) .
This meta- analysis was conducted to determine the proximal bone remodelling , revision rate , Harris Hip Score , radiolucent line and maximum total point motion values of both SS and CS for primary THA .