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 .
A prospective cohort study on the short collum femoris-preserving (CFP) stem using RSA and DXA
Background and purpose Short femoral stems have been introduced in total hip arthroplasty in order to save proximal bone stock . We hypothesized that a short stem preserves periprosthetic bone mineral density ( BMD ) and provides good primary stability . Methods We carried out a prospect i ve cohort study of 30 patients receiving the collum femoris-preserving ( CFP ) stem .  Preoperative total hip BMD and postoperative periprosthetic BMD in Gruen zones 1–7 were investigated by dual-energy x-ray absorptiometry ( DXA ) , stem migration was analyzed by radiostereometric analysis ( RSA ) , and the Harris hip score ( HHS ) was determined . Results 2 patients were excluded intraoperatively and 1 patient was revised due to a deep infection , leaving 27 patients for analysis . The mean HHS increased from 49 ( 24–79 ) preoperatively to 99 ( 92–100 ) after 2 years . DXA after 1 year showed substantial loss of BMD in Gruen zone 7 ( –31 % ) , zone 6 ( –19 % ) , and zone 2 ( –13 % , p < 0.001 ) compared to baseline BMD determined immediately postoperatively . The bone loss in these regions did not recover after 2 years , whereas the more moderate bone loss in Gruen zones 1 , 3 , and 5 partially recovered . There was a correlation between low preoperative total hip BMD and a higher amount of bone loss in Gruen zones 2 , 6 and 7 . RSA showed minor micromotion of the stem : mean subsidence was 0.13 ( 95 % CI : –0.28 to 0.01 ) mm and mean rotation around the longitudinal axis was 0.01º ( 95 % CI : –0.1 to 0.39 ) after 2 years . Interpretation We conclude that substantial loss in proximal periprosthetic BMD can not be prevented by the use of a novel type of short , curved stem , and forces appear to be transmitted distally . However , the stems showed very small migration — a characteristic of stable uncemented implants
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 .