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 .
Primary Total Hip Arthroplasty with a Second-Generation Cementless Total Hip Prosthesis in Patients Younger Than Fifty Years of Age
Background : The early experience with cementless total hip replacement led to design modifications to increase the initial press-fit and stability of the femoral component , to reduce the diameter of the femoral head , and to improve the acetabular component , including the locking mechanism of the shell and the quality of the polyethylene liner . We performed a prospect i ve study to assess the results in young patients who had been followed for a minimum of eight years after treatment with a primary total hip arthroplasty with a second-generation cementless prosthesis . Methods : Eighty patients ( 118 hips ) were included in the study . There were fifty-eight men and twenty-two women ; the mean age at the time of the operation was 46.8 years ( range , twenty-one to forty-nine years ) . We used a cementless Duraloc series-100 or 1200 acetabular component with or without screw fixation , a polyethylene liner with a 22-mm inner diameter , and a cementless Profile femoral component in all hips . The average duration of follow-up was 9.8 years ( range , eight to eleven years ) . Clinical follow-up ( with use of the Harris hip score ) and radiographic follow-up were performed at six weeks ; at three , six , and twelve months ; and yearly thereafter . Linear and volumetric wear were measured , and bone-remodeling and osteolysis were assessed . Results : The average Harris hip score improved from 48.8 points preoperatively to 92 points at the final follow-up examination . The prevalence of transitory thigh pain was 10 % ( twelve of 118 hips ) . There was no aseptic loosening . One hip was revised because of recurrent dislocation . The average amount of linear wear was 1.18 mm , and the average wear rate was 0.12 mm/yr . Fourteen hips ( 12 % ) had osteolysis in the calcar femorale and eleven hips ( 9 % ) had acetabular osteolysis , but all of the osteolytic lesions were < 1 cm 2 . Conclusions : The mechanical fixation of the anatomic fit cementless Profile stem was excellent in this study of young patients who were particularly difficult to treat because of a high prevalence of osteonecrosis and developmental dysplasia . Although there was no aseptic loosening of the components and a relatively low prevalence of osteolysis , there was a high rate of linear wear of the polyethylene liner . Level of Evidence : Therapeutic study , Level IV ( case series [ no , or historical , control group ] ) . See p. 2 for complete description of levels of evidence
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 .