Prospective study of a cementless total hip arthroplasty with a collum femoris preserving stem and a trabeculae oriented pressfit cup: minimun 6-year follow-up Robot-assisted primary cementless total hip arthroplasty with a short femoral stem: a prospective randomized short-term outcome study Reproducibility of femoral offset following short stem and straight stem total hip arthroplasty. Robot-assisted primary cementless total hip arthroplasty with a short femoral stem: a prospective randomized short-term outcome study. A prospective cohort study on the short collum femoris-preserving (CFP) stem using RSA and DXA Bone remodelling around the Metha short stem in total hip arthroplasty: a prospective dual-energy X-ray absorptiometry study No Difference in Periprosthetic Bone Loss and Fixation Between a Standard-Length Stem and a Shorter Version in Cementless Total Hip Arthroplasty. A Randomized Controlled Trial. Cementless primary total hip replacement. Four to eight year results with the Zweymüller-Alloclassic prosthesis. Primary total hip arthroplasty with a proximally porous-coated femoral stem. Failure of the Uncoated Titanium ProxiLock Femoral Hip Prosthesis Comparison of Bone Remodeling Between an Anatomic Short Stem and a Straight Stem in 1-Stage Bilateral Total Hip Arthroplasty. The validity of a novel radiological method for measuring femoral stem version on anteroposterior radiographs of the hip after total hip arthroplasty. Differences in stability and bone remodeling between a customized uncemented hydroxyapatite coated and a standard cemented femoral stem A randomized study with use of radiostereometry and bone densitometry. [Two-year results of a modular short hip stem prosthesis--a prospective study]. [Clinical outcome following robotic assisted versus conventional total hip arthroplasty: a controlled and prospective study of seventy-one patients]. Primary Total Hip Arthroplasty with a Porous-Coated Acetabular Component. Seven-to-Ten-Year Results* Comparison of mid-term clinical outcomes after primary total hip arthroplasty with Oxinium vs cobalt chrome femoral heads.
Aim Tissue sparing hip prostheses are becoming more and more popular especially for the treatment of younger patients . The objective of this study was to evaluate the clinical and radiological results after insertion of a tissue sparing hip prosthesis . Method In 47 consecutive non-selected patients ( 50 hips ) , the clinical and radiographic results of cementless total hip arthroplasty using a collum femoris preserving stem , a pressfit cup and an alumina – polyethylene pairing were prospect ively evaluated . The mean age at index-surgery was 58 ( 36–82 ) years , there were 38 women and 9 men . After a mean follow-up of 6.8 years ( minimum 6.1 years ) , two patients had died and one patient underwent revision surgery due to aseptic loosening of the stem . Results The overall survival rate of the acetabular component was 100 % and of the femoral component 98 % . The mean Harris hip score at follow-up was 94 points . Conclusion The mid-term survival with this type of total hip arthroplasty is excellent and compares equal with uncemented straight stems in this age group Abstract Background : Recently , two topical issues in total hip arthroplasty ( THA ) have been robot-assisted surgery and use of a short stem . The purpose of this study was to evaluate the effects of robotic milling on the accuracy of short femoral stem positioning and on the short-term clinical outcome in THA using a prospect i ve , r and omized design . Methods : We r and omized 54 patients into two groups , either robotic milling group or manual rasping group .  The patients were assessed clinical ly and radiographically at 8 weeks , 5 months , 12 months , and 24 months . Results : Robotic milling group had a significantly longer operation time , requiring on average 8.9 min for registration and 11.2 min for milling . On the other h and , robotic milling group showed superior results in terms of stem alignment and leg length e quality . Two intraoperative femoral fractures occurred only in manual rasping group . Harris hip scores and WOMAC scores at 24 months postoperatively were similar in both groups . No complications including stem loosening , infection , nerve palsy , or dislocation were encountered in either group during the follow-up period . Conclusions : The present study suggested that robot-assisted short stem THA could increase the accuracy of stem alignment , improve leg length e quality , and help reduce the risk of intraoperative femoral fracture as compared with manual rasping . However , the clinical outcome scores did not differ between the two groups at the time of short-term follow-up . Long-term follow-up is needed to determine whether there will be a long-term clinical relevance of robot-assisted implantation of short femoral stems in THA Bone stock-preserving short stem prostheses have gained importance in  total hip arthroplasty ( THA ) with the use of minimally invasive surgical procedures . Because of their metaphyseal fixation and their dependency on the calcar radius , it is unknown whether the femoral offset can be reproduced with the same accuracy following short stem vs st and ard stem THA . This study clarifies whether it is possible to restore the femoral offset using a short stem prosthesis ( Fitmore ; Zimmer , Warsaw , Indiana ) compared with a conventional straight stem prosthesis ( CLS ; Zimmer ) following minimally invasive implantation using an anterolateral approach . In a prospect i ve , r and omized , double-blinded study , 80 patients underwent THA using a short stem ( SS group ; n=40 ) or CLS implant ( control group ; n=40 ) . Follow-up examinations were conducted 6 weeks postoperatively . Radiological and functional outcomes were measured . Subjective assessment of quality of life was evaluated using the Harris Hip Score ( HHS ) , the Short Form 36-item health survey ( SF-36 ) , and the Western Ontario and McMaster Universities Osteoarthritis Index ( WOMAC ) . Pre- and postoperative comparison of the groups ' change in offset showed no significant differences ( SS group difference from pre- to postoperative , 6.1±6.5 mm ; control group difference from pre- to postoperative , 6.5±7.1 mm ; P=.93 ) . Group comparison after 6 weeks revealed no significant differences in HHS , SF-36 , or WOMAC . Based on these data , an equivalent reproducibility of the femoral offset was demonstrated following short stem and straight stem THA using a minimally invasive anterolateral approach . If the long-term results of short stems show a comparable survival , they represent a sensible alternative to st and ard stems BACKGROUND Recently , two topical issues in total hip arthroplasty ( THA ) have been robot-assisted surgery and use of a short stem . The purpose of this study was to evaluate the effects of robotic milling on the accuracy of short femoral stem positioning and on the short-term clinical outcome in THA using a prospect i ve , r and omized design . METHODS We r and omized 54 patients into two groups , either robotic milling group or manual rasping group .  The patients were assessed clinical ly and radiographically at 8 weeks , 5 months , 12 months , and 24 months . RESULTS Robotic milling group had a significantly longer operation time , requiring on average 8.9 min for registration and 11.2 min for milling . On the other h and , robotic milling group showed superior results in terms of stem alignment and leg length e quality . Two intraoperative femoral fractures occurred only in manual rasping group . Harris hip scores and WOMAC scores at 24 months postoperatively were similar in both groups . No complications including stem loosening , infection , nerve palsy , or dislocation were encountered in either group during the follow-up period . CONCLUSIONS The present study suggested that robot-assisted short stem THA could increase the accuracy of stem alignment , improve leg length e quality , and help reduce the risk of intraoperative femoral fracture as compared with manual rasping . However , the clinical outcome scores did not differ between the two groups at the time of short-term follow-up . Long-term follow-up is needed to determine whether there will be a long-term clinical relevance of robot-assisted implantation of short femoral stems in THA 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 Purpose On the basis of positive clinical results with mid- and long-term follow-up using the Mayo short stem , the Metha neck-preserving stem ( BBraun , Aesculap , Tuttlingen , Germany ) was introduced . The purpose of this study was to vali date the implant design by direct acquisition of bone remodelling data from total hip arthroplasty ( THA ) recipients using dual-energy X-ray absorptiometry ( DEXA ) . Methods After power analysis , 25 patients were included in this prospect i ve study . Patients were examined clinical ly and underwent DEXA examinations preoperatively and postoperatively at one week , six months and one and two years after THA . Gruen zones were adapted to the short stem design ( R1–R7 ) . Results The Harris Hip Score ( HHS ) increased significantly by 31 points . No stem had to be revised . Bone mineral density ( BMD ) in the greater trochanter decreased significantly from 0.78 g/cm2 postoperatively to 0.72 g/cm2 two years after surgery . Marginal changes were seen in the lateral distal regions ( R4–R5 ) . In the minor trochanter region , BMD increased significantly after two years by 12.9 % . In the calcar region , BMD exceeded the baseline value by 6.1 % two years after implantation . Conclusions Stress shielding seems to occur at the greater trochanter due to the vast cross-section of the implant . However , the aim of proximal load transfer of the Metha stem seems to be partially achieved . DEXA analysis revealed a concentrated load distribution on the medial portion of the femur , which is an important region to guarantee long-term implant survival BACKGROUND Cementless femoral stems in total hip arthroplasty provide dependable clinical and radiographic results in the treatment of osteoarthritis . Stem length might affect the preservation of proximal bone stock and stability . We hypothesized that a shorter stem decreases proximal bone loss without affecting implant stability . METHODS We r and omly assigned 60 patients aged between 50 and 70 years to either a st and ard cementless femoral stem or a 35-mm shorter version . Patients were followed with dual-energy X-ray absorptiometry , radiostereometric analysis , Harris hip score , Western Ontario and McMaster Universities Osteoarthritis Index score , and clinical follow-up at 3 , 6 , 12 , and 24 months . The trial is registered on Clinical Trials.gov/. RESULTS After 24 months , short stems had on average 3.8 % ( 95 % confidence interval , 1.2%-8.9 % ) more bone loss in zone 1 compared to st and ard stems ( P = .14 ) . In zone 7 , the bone loss was on average 6.5 % ( 95 % confidence interval , 6.6%-19.7 % ) higher compared to st and ard stems ( P = .33 ) . After 24 months , st and ard stems had migrated 0.93 mm ( range , 0.25 - 4.66 mm ) and short stems 0.93 mm ( range , 0.17 - 2.96 mm ; Student t-test after log transformation , P = .3 ) . Patient-reported outcome measures were similar in both groups . One patient in the st and ard stem group was diagnosed with infection , one with a posterior dislocation , and one with a deep venous thrombosis . No stems were revised . CONCLUSION There were no statistically significant differences in periprosthetic bone loss or fixation between the stems at 24 months One hundred and twenty-nine consecutive cementless primary total hip arthroplasties with Zweymüller-Alloclassic grit-blasted titanium components  were evaluated prospect ively at an average follow-up of 5.9 years . The clinical results were grade d as excellent or good in 116 hips ( 90 % ) , fair in 12 , and poor in one due to a fracture of the femoral shaft at operation leading to early stem loosening and delayed ring loosening . Failure was defined as definite aseptic loosening , and the final survivorship at 8 years was 99.3 % for the SL-stem , and 99.1 % for the CSF-threaded cup . These early results compare favourably with those of total hip arthroplasties using new cementing techniques BACKGROUND The use of cementless , proximally porous-coated femoral stems for total hip arthroplasty has increased in popularity . The purpose of the present report was to examine the five to ten-year results associated with the use of a so-called second-generation circumferentially proximally porous-coated titanium-alloy stem . METHODS Between 1991 and 1994 , 123 Harris-Galante Multilock femoral stems were implanted in 101 patients . The average age of the patients at the time of surgery was 53.8 years . The patients were followed prospect ively and were reevaluated at a minimum of five years postoperatively . No patient was lost to follow-up . Twenty-five patients ( thirty hips ) were interviewed by telephone , and four patients ( five hips ) died during the study period because of problems that were unrelated to the operation . The remaining seventy-two patients ( eighty-eight hips ) had a minimum of five years of clinical and radiographic follow-up . RESULTS The average duration of follow-up was seventy-eight months . At the time of the most recent follow-up , the average Harris Hip Score was 95 points . Eighty-seven ( 99 % ) of eighty-eight stems were biologically stable , with eighty-four hips ( 95 % ) having osseous ingrowth and three hips ( 3 % ) having stable fibrous fixation . One stem was revised because of loosening . Thirty-three hips ( 38 % ) had minimal proximal osteolysis , and no hip had diaphyseal osteolysis . Seventy-two hips ( 82 % ) had some degree of stress-shielding in the proximal metaphysis , but only two hips had cortical resorption . None of these patients required additional surgery , and all reported a satisfactory outcome . CONCLUSIONS Given the young age and high activity level of these patients , this stem fared well : the levels of patient function and satisfaction were high , the rates of loosening and revision were very low , and distal osteolysis did not occur . Osseous fixation occurred reliably . Proximal stress-shielding was seen but did not seem to be clinical ly important New prostheses should be evaluated for stability and clinical performance . In a prospect i ve r and omized clinical trial , we implanted 22 titanium ( Ti ) and 20 hydroxyapatite-coated ( HA ) ProxiLock femoral hip prostheses during total hip arthroplasty in 42 patients . The patients were followed for 24 months with clinical , radiographic and radiostereometric analysis . Full weightbearing was allowed immediately postoperatively . One patient with a titanium stem was lost to followup . During the first two months , 34 of the 41 stems subsided and /or rotated towards retroversion , regardless of stem type . At the 24-month followup 35 of the 41 prostheses were either fully stabilized ( 16 HA and 11 Ti stems ) or had clinical irrelevant migration ( four HA and four Ti stems ) . Six Ti prostheses showed continuous migrations with maximums of 4.7 mm translation and 12.2 ° retroversion ; four of these were revised , the other two had no clinical complaints . Clinical relevance : The migration pattern we found indicates insufficient primary fixation of the ProxiLock stem in an immediate full weightbearing protocol . The HA coating improves the secondary stability of the prosthesis compared to the uncoated stem . Early migration is associated with an increased risk of possible future loosening and revision , and therefore we discontinued the use of this prosthesis . Level of Evidence : Therapeutic Level I. See Guidelines for Authors for a complete description of levels of evidence BACKGROUND Femurs of dysplastic hips exhibit specific abnormalities , and use of modular or specially design ed components is recommended . An anatomic short stem was previously design ed specifically for dysplastic hips using 3-dimensional data acquired from dysplastic patients . To investigate effects of stem geometry on bone remodeling , we undertook a prospect i ve , r and omized study of patients who had undergone 1-stage bilateral total hip arthroplasty ( THA ) with the anatomic short stem on one side and a conventional straight stem on the other . METHODS The study included 36 patients who underwent the above THA procedure . We assessed bone mineral density as well as the presence of cancellous condensation or bony atrophy due to stress shielding based on the analysis of Gruen 's zones and newly defined equal-interval zones , at an average follow-up period of 9.2 years . RESULTS All stems were bone ingrown stable . Cancellous condensation was observed more proximally , and areas of bone atrophy were narrower on the anatomic short stem side than on the straight stem side . Bone mineral density values reflected results of cancellous condensation and stress shielding and were higher in more proximal zones on the anatomic short stem side than on the straight stem side . CONCLUSION Although radiographic results indicated good midterm outcomes of THA with both stems , the loading pattern differed . The anatomic short stem achieved its design purpose in terms of proximal fixation and load transfer and led to better preservation of the proximal femur Femoral stem version has a major influence on impingement and early post-operative stability after total hip arthroplasty ( THA ) . The main objective of this study was to evaluate the validity of a novel radiological method for measuring stem version .  Anteroposterior ( AP ) radiographs and three-dimensional CT scans were obtained for 115 patients ( female/male 63/72 , mean age 62.5 years ( 50 to 75 ) ) who had undergone minimally invasive , cementless THA .  Stem version  was calculated from the AP hip radiograph by rotation-based change in the projected prosthetic neck-shaft ( NSA * ) angle using the mathematical formula ST = arcos [ tan ( NSA * ) / tan ( 135 ) ] . We used two independent observers who repeated the analysis after a six-week interval . Radiological measurements were compared with 3D-CT measurements by an independent , blinded external institute . We found a mean difference of 1.2 ° ( sd 6.2 ) between radiological and 3D-CT measurements of stem version . The correlation between the mean radiological and 3D-CT stem torsion was r = 0.88 ( p < 0.001 ) . The intra- ( intraclass correlation coefficient ≥ 0.94 ) and inter-observer agreement ( mean concordance correlation coefficient = 0.87 ) for the radiological measurements were excellent . We found that femoral tilt was associated with the mean radiological measurement error ( r = 0.22 , p = 0.02 ) . The projected neck-shaft angle is a reliable method for measuring stem version on AP radiographs of the hip after a THA . However , a highly st and ardised radiological technique is required for its precise measurement The custom made Unique stem is design ed to fit closely to the metaphyseal region of the femur in order to obtain maximum mechanical stability and optimal load transfer . Thirty-seven patients ( 38 hips ) with non-inflammatory arthritis were r and omized to the uncemented custom made Unique stem or the Elite Plus stem inserted with cement . The patients have been followed clinical ly as well as with radiostereometry ( RSA ) and Dual-energy X-ray Absorptiometry ( DXA ) for 2 years . After 2 years the RSA result showed minimal translation and rotation for the Unique stem while the Elite Plus rotated slightly ( mean 1.05 degrees ) into retroversion . Compared to previous studies the Elite Plus was as stable as the Charnley prosthesis . The DXA results showed a significantly higher proximal and total ( 10 % for the Unique versus 5 % for Elite ) bone loss for the Unique stem compared to the Elite Plus . Thus the optimal proximal press-fit of the custom made stem did secure a stable fixation , but did not decrease the proximal bone loss AIM The short-term results of a prospect i ve , consecutive series of 50 cementless modular short hip stem endoprostheses  are reported . METHOD 48 cases were available for clinical and radiological follow-up at an average time of 2.4 years post-op . One patient did not consent to a follow-up investigation , 1 early revision was necessary 4 weeks post-op after a fall precipitating a periprosthetic fracture . RESULTS The average age at the time of THA was 54 years and the Harris hip score reached 95 points at the time of follow-up . One implant had aseptic loosening and 1 implant was revised due to a failure of the modular titanium neck adapter . An equal number of patients received modular neck adapters with neutral or 7.5 degrees retroversion . No 140 degrees neck and no anteverted neck adapters were used . Radiological results of the 2/3 porous coated hip stem showed a metaphyseal bone remodelling with hypertrophies in coated Gruen zones 3 ( 17 % ) and 6 ( 46 % ) and marked spot welds and increased bone density ( 86 % ) in the distal area of the coating . Primary implant migration between 2 and 10 mm was present in 7 cases due to a low osteotomy and implant position combined with an implant undersizing and lack of proximal-lateral support . At the time of the last follow-up these cases had no clinical symptoms with an average HHS of 96 points and with full bony integration . CONCLUSION Our results support the use of the investigated short hip stem for THA when the femoral bone quality and morphology support the metaphyseal anchoring concept . The surgical technique must avoid a stem position without proximal-lateral cortical contact to the femoral osteotomy , as this reduces primary implant stability . Further follow-up is necessary to vali date the long-term success of this procedure AIM Robotic assisted total hip arthroplasty  remains controversial , since wider exposure of the proximal femur and placement of the leg in maximal hip adduction and external rotation using a rigid leg-holder apparatus may impair significantly the hip abductors . Consequently , it is the purpose of this study to analyse and report both clinical outcome and hip abductor function following robotic assisted versus conventional total hip arthroplasty . MATERIAL AND METHODS 36 robotic-assisted ( CASPAR , Orto-Maquet , Rastatt , Germany ) and 35 conventional cementless total hip arthroplasties  were followed on average for 18 months regarding incidence of complications , Harris hip score , the scoring system according to Merle d'Aubigné and Postel , hip abductor function ( using a spring-balance ) , and incidence of Trendelenburg 's sign ( according to the Kuhfuss-classification ) . Statistical analysis was performed in case of continuous data using the t test and the Mann-Whitney test , respectively , and in case of categorical data using Fisher 's exact test and the chi-squared test , respectively . The level of significance was set as p < 0.05 . RESULTS Average duration of surgery ( CASPAR : 100.6 min ; conventional : 51.5 min ; p < 0.0001 ) as well as average loss of haemoglobin ( CASPAR : 4.5 mg/dL ; conventional : 3.3 mg/dL ; p = 0.0002 ) differed significantly , whereas the incidence of complications ( CASPAR : two dislocations , one sciatic paresis , one deep infection ; conventional : one dislocation , two fissures ) , revision rate ( CASPAR : 5.6 % ; conventional : 2.9 % ) , and incidence of heterotopic ossifications ( CASPAR : 30.6 % ; conventional : 17.1 % ) was comparable following both procedures ( p > 0.05 ) . Improvement of the Harris hip score also was comparable in both groups ( CASPAR : 40.9 to 86.1 points ; conventional : 39.5 to 88.0 points ; p = 0.21 ) , whereas improvement of the score according to Merle d'Aubigné and Postel was significantly greater following the manual procedure ( CASPAR : 10.1 to 16.0 points ; conventional : 8.3 to 16.6 points ; p < 0.0001 ) . Differences between the two groups were also significant regarding hip abductor function ( CASPAR : 76.1 % ; conventional : 93.8 % of the contralateral hip ; p < 0.0001 ) and incidence of Trendelenburg 's sign ( CASPAR : 61.1 % ; conventional : 25.7 % ; p = 0.0014 ) . CONCLUSION The significant functional impairment following robotic assisted THA should be taken critically into consideration prior to initiating such procedure One hundred and eighty-four patients who had been managed , between 1984 and 1985 , with a total of 204 consecutive primary total hip arthroplasties with insertion of a Harris-Galante type-I acetabular component without cement were prospect ively studied . There were eighty-two men ( 45 per cent ) and 102 women ( 55 per cent ) . The mean age at the time of the operation was fifty-two years ( range , twenty to eighty-four years ) . One hundred and fifty-seven patients ( 173 hips ) were available for clinical review at a mean of 104 months ( range , seventy-eight to 126 months ) . At this time , the mean preoperative Harris hip score of 52 points ( range , 12 to 79 points ) had improved to a mean of 90 points ( range , 44 to 100 points ) . Two patients ( two hips ) had had an exchange of an excessively worn polyethylene liner . One patient ( one hip ) had had débridement and grafting of an area of massive retroacetabular osteolysis . Two stable acetabular components ( 1 per cent ) had been revised at the time of femoral revision . None of the cups had been revised because of aseptic loosening . Radiographic examination of 150 patients ( 165 hips ) at a mean of 104 months ( range , seventy-eight to 126 months ) revealed that 156 cups ( 95 per cent ) were stable . Eight cups ( 5 per cent ) were considered to be possibly unstable , with a radiolucent line between the prosthesis and the bone that was one millimeter wide or less in at least four of five zones ; two of the eight had a complete radiolucent line in all zones . One component , which had been implanted with a bulk allograft from a femoral head , migrated more than two millimeters in the first two years and then stabilized without complication . Osteolysis was seen in seven acetabula ( 4 per cent ) and was limited to the periphery of the cup in six . Survivorship analysis at ten years revealed that the acetabular component had a 99 per cent chance of survival ( 95 per cent confidence interval , 0.98 to 1.0 ) with revision or aseptic loosening as the end point and a 97 per cent chance of survival ( 95 per cent confidence interval , 0.95 to 1.0 ) with revision , aseptic loosening , or reoperation because of a problem related to the acetabular component as the end point The purpose of this investigation was to assess the midterm clinical outcomes after implantation of Oxinium ( OX ) vs cobalt-chrome ( CC ) femoral heads .  Primary total hip arthroplasty ( THA ) procedures were performed in 100 patients . After r and omization , half of the patients received OX femoral heads and half received CC femoral heads . At a minimum follow-up of 2-years , stem survival was 98 % for both groups . The mean Harris Hip score was 92 for OX and 92.5 for CC , with mean WOMAC scores of 84.9 and 87 , respectively . For SF-12 , the OX group had mean physical and mental component scores of 45.2 and 53.8 and the CC group 49.2 and 52.6 , respectively . At a minimum follow-up of 2 years , clinical outcomes for THA procedures using OX and CC femoral heads appear equivalent
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 .