Mobile-bearing lateral unicompartmental knee replacement with the Oxford domed tibial component: an independent series. The results of Oxford unicompartmental knee arthroplasty in the United States Mid‐term results of Oxford phase‐3 medial unicompartmental knee arthroplasty for medial arthritis in Chinese patients The clinical outcome of minimally invasive Phase 3 Oxford unicompartmental knee arthroplasty: a 15-year follow-up of 1000 UKAs. Outcome of Unicondylar Knee Arthroplasty vs Total Knee Arthroplasty for Early Medial Compartment Arthritis: A Randomized Study. Oxford phase 3 unicompartmental knee replacement in Korean patients. Increased Risk of Osteoarthritis After Anterior Cruciate Ligament Reconstruction Minimally invasive Oxford phase 3 unicompartmental knee replacement: results of 1000 cases. Mobile vs. fixed bearing unicondylar knee arthroplasty: A randomized study on short term clinical outcomes and knee kinematics. Ten- to 15-year results of the Oxford Phase III mobile unicompartmental knee arthroplasty An 11- to 15-year clinical outcome study of the Advance Medial Pivot total knee arthroplasty: pivot knee arthroplasty. [Fixed-bearing versus mobile-bearing total knee arthroplasty: a prospective randomized clinical and radiological study]. Conventional versus computer-navigated TKA: a prospective randomized study Knee Arthroplasty With a Medially Conforming Ball-and-Socket Tibiofemoral Articulation Provides Better Function Mobile bearing UKA compared to fixed bearing TKA: a randomized prospective study. Fixed- versus Mobile-Bearing Total Knee Arthroplasty in Indian Patients Minimally invasive Oxford medial unicompartmental knee arthroplasty. A note of caution!
The Oxford mobile-bearing unicompartmental knee replacement ( UKR )  is an effective and safe treatment for  osteoarthritis of the medial compartment . The results in the lateral compartment have been disappointing due to a high early rate of dislocation of the bearing . A series using a newly design ed domed tibial component is reported . The first 50 consecutive domed lateral Oxford UKRs in 50 patients with a mean follow-up of three years ( 2.0 to 4.3 ) were included .  Clinical scores were obtained prospect ively and Kaplan-Meier survival analysis was performed for different endpoints . Radiological variables related to the position and alignment of the components were measured . One patient died and none was lost to follow-up . The cumulative incidence of dislocation was 6.2 % ( 95 % confidence interval ( CI ) 2.0 to 17.9 ) at three years . Survival using revision for any reason and aseptic revision was 94 % ( 95 % CI 82 to 98 ) and 96 % ( 95 % CI 85 to 99 ) at three years , respectively . Outcome scores , visual analogue scale for pain and maximum knee flexion showed a significant improvement ( p < 0.001 ) . The mean Oxford knee score was 43 ( SD 5.3 ) , the mean Objective American Knee Society score was 91 ( SD 13.9 ) and the mean Functional American Knee Society score was 90 ( SD 17.5 ) . The mean maximum flexion was 127 ° ( 90 ° to 145 ° ) . Significant elevation of the lateral joint line as measured by the proximal tibial varus angle ( p = 0.04 ) was evident in the dislocation group when compared with the non-dislocation group . Clinical results are excellent and short-term survival has improved when compared with earlier series . The risk of dislocation remains higher using a mobile-bearing UKR in the lateral compartment when compared with the medial compartment . Patients should be informed about this complication . To avoid dislocations , care must be taken not to elevate the lateral joint line Aims Approved by the Food and Drug Administration in 2004 , the Phase III Oxford Medial Partial Knee is used to treat anteromedial osteoarthritis ( AMOA ) in patients with an intact anterior cruciate ligament . This unicompartmental knee arthroplasty ( UKA ) is relatively new in the United States , and therefore long-term American results are lacking . Patients and Methods This is a single surgeon , retrospective study based on prospect ively collected data , analysing a consecutive series of primary UKAs using the  Phase III mobile-bearing Oxford Knee and Phase III instrumentation . Between July 2004 and December 2006 , the senior author ( RHE ) carried out a  medial UKA in 173 patients ( 213 knees ) for anteromedial osteoarthritis or avascular necrosis ( AVN ) . A total of 95 patients were men and 78 were women . Their mean age at surgery was 67 years ( 38 to 89 ) and mean body mass index 29.87 kg/m2 ( 17 to 62 ) . The mean follow-up was ten years ( 4 to 11 ) . Results Survivorship of the Oxford UKA at ten years was 88 % , using life table analysis . Implant survivorship at ten years was 95 % . The most common cause for revision was the progression of osteoarthritis in the lateral compartment . The mean knee score element of the American Knee Society Score ( AKSS ) was 50 pre-operatively and increased to 93 post-operatively . The mean AKSS function score was 56 pre-operatively rising to 78 post-operatively Conclusion This ten-year follow-up study of the Oxford UKA undertaken in the United States shows good survivorship and excellent function in a wide selection of patients with AMOA and AVN . Cite this article : Bone Joint J 2016;98-B(10 Suppl B):34–40 The purpose of this study was to evaluate the mid‐term results of an Oxford phase‐3 unicompartmental knee arthroplasty ( UKA ) for medial arthritis in Chinese patients There have been concerns about the long-term survival of unicompartmental knee arthroplasty ( UKA ) . This prospect i ve study reports the 15-year survival and ten-year functional outcome of a consecutive series of 1000 minimally invasive Phase 3 Oxford medial UKAs ( 818 patients , 393 men , 48 % , 425 women , 52 % , mean age 66 years ; 32 to 88 ) . These were implanted by two surgeons involved with the design of the prosthesis to treat anteromedial osteoarthritis and spontaneous osteonecrosis of the knee , which are recommended indications . Patients were prospect ively identified and followed up independently for a mean of 10.3 years ( 5.3 to 16.6 ) . At ten years , the mean Oxford Knee Score was 40 ( st and ard deviation ( sd ) 9 ; 2 to 48 ) : 79 % of knees ( 349 ) had an excellent or good outcome . There were 52 implant-related re-operations at a mean of 5.5 years ( 0.2 to 14.7 ) . The most common reasons for re-operation were arthritis in the lateral compartment ( 2.5 % , 25 knees ) , bearing dislocation ( 0.7 % , seven knees ) and unexplained pain ( 0.7 % , seven knees ) . When all implant-related re-operations were considered as failures , the ten-year rate of survival was 94 % ( 95 % confidence interval ( CI ) 92 to 96 ) and the 15-year survival rate 91 % ( CI 83 to 98 ) . When failure of the implant was the endpoint the 15-year survival was 99 % ( CI 96 to 100 ) . This is the only large series of minimally invasive UKAs with 15-year survival data . The results support the continued use of minimally invasive UKA for the recommended indications BACKGROUND With increasing number of patients with early osteoarthritis of knee opting for total knee arthroplasty ( TKA ) , there has been increase in patients dissatisfied with surgical outcomes . It is being presumed that offering unicondylar knee arthroplasty ( UKA ) to them would improve outcomes . METHODS Primary objective of our study was to look for any difference in patient-reported outcome and function at 2-year follow-up in patients undergoing UKA as compared to TKA .  Our study was a r and omized study with parallel assignment conducted at a high-volume specialized arthroplasty center . Eighty patients with bilateral isolated medial compartment knee arthritis were r and omized into simultaneous 2-team bilateral TKA ( n = 40 ) and UKA ( n = 40 ) group . We finally analyzed 36 patients in each group . Main outcome measure was improvement in Knee Outcome Survey-Activities of Daily Living Scale ( KOS-ADLS ) and High Activity Arthroplasty Score ( HAAS ) obtained at 2-year follow-up . RESULTS Improvement in KOS-ADLS and HAAS at 2 years was similar ( P = .2143 and .2010 ) in both groups . Performance as assessed with Delaware index was also similar . Length of hospital stay was less in UKA group ( 6.6 days as against 5.4 days ) . Complications and readmission rates were more in TKA group ( nil in UKA group ; 08 in TKA group ) . CONCLUSION At 2-year follow-up , UKA provides similar improvement in patient-reported outcomes , function , and performance as compared to TKA when performed in patients with early arthritis . However , UKA patients have shorter hospital stay and fewer complications Medium-term survivorship of the Oxford phase 3 unicompartmental knee replacement ( UKR ) has not yet been established in an Asian population . We prospect ively evaluated the outcome of 400 phase 3 Oxford UKRs in 320 Korean patients with a mean age at the time of operation of 69 years ( 48 to 82 ) . The mean follow-up was 5.2 years ( 1 to 10 ) . Clinical and radiological assessment was carried out pre- and post-operatively . At five years , the mean Knee Society knee and functional scores had increased significantly from 56.2 ( 30 to 91 ) pre-operatively to 87.2 ( 59 to 98 ) ( p = 0.034 ) and from 59.2 ( 30 to 93 ) to 88.3 ( 50 to 100 ) ( p = 0.021 ) , respectively . The Oxford knee score increased from a mean of 25.8 ( 12 to 39 ) pre-operatively to 39.8 ( 25 to 58 ) at five years ( p = 0.038 ) . The ten-year survival rate was 94 % ( 95 % confidence interval 90.1 to 98.0 ) . A total of 14 UKRs ( 3.5 % ) required revision . The most common reason for revision was dislocation of the bearing in 12 ( 3 % ) . Conversion to a total knee replacement was required in two patients who developed osteoarthritis of the lateral compartment . This is the largest published series of UKR in Korean patients . It shows that the mid-term results after a minimally invasive Oxford phase 3 UKR can yield satisfactory clinical and functional results in this group of patients Background : The reported prevalence of  radiological osteoarthritis ( OA ) after anterior cruciate ligament ( ACL ) reconstruction  varies from 10 % to 90 % . Purpose /Hypothesis : To report the prevalence of OA after ACL reconstruction and to compare the OA prevalence between quadrupled semitendinosus tendon ( ST ) and bone – patellar tendon – bone ( BPTB ) grafts . The hypothesis was that there would be no difference in OA prevalence between the graft types . The secondary aim was to study whether patient characteristics and additional injuries were associated with long-term outcomes . Study Design : R and omized controlled trial ; Level of evidence , 1 . Methods : Radiological examination results , Tegner activity levels , and Knee injury and Osteoarthritis Outcome Score ( KOOS ) values were determined in 135 ( 82 % ) of 164 patients at a mean of 14 years after ACL reconstruction r and omized to an ST or a BPTB graft .  Osteoarthritis was defined according to a consensus by at least 2 of 3 radiologists of Kellgren-Lawrence grade ≥2 . Using regression analysis , graft type , sex , age , overweight , time between injury and reconstruction , additional meniscus injury , and a number of other variables were assessed as risk factors for OA 14 years after ACL reconstruction . Results : Osteoarthritis of the medial compartment was most frequent , with 57 % of OA cases in the ACL-reconstructed knee and 18 % of OA cases in the contralateral knee ( P < .001 ) . There was no difference between the graft types : 49 % of OA of the medial compartment for BPTB grafts and 65 % for ST grafts ( P = .073 ) . The KOOS results were lower for patients with OA in all subscales , indicating that OA was symptomatic . No difference in the KOOS between the graft types was found . Meniscus resection was a strong risk factor for OA of the medial compartment ( odds ratio , 3.6 ; 95 % CI , 1.4 - 9.3 ) in the multivariable logistic regression analysis . Conclusion : A 3-fold increased prevalence of OA was found after an ACL injury treated with reconstruction compared with the contralateral healthy knee . No differences in the prevalence of OA between the BPTB and quadrupled ST reconstructions were found . An initial meniscus resection was a strong risk factor for OA ; the time between injury and reconstruction was not This prospect i ve study describes the outcome of the first 1000 phase 3 Oxford medial unicompartmental knee replacements ( UKRs ) implanted using a minimally invasive surgical approach for the recommended indications by two surgeons and followed up independently . The mean follow-up was 5.6 years ( 1 to 11 ) with 547 knees having a minimum follow-up of five years . At five years their mean Oxford knee score was 41.3 ( sd 7.2 ) , the mean American Knee Society Objective Score 86.4 ( sd 13.4 ) , mean American Knee Society Functional Score 86.1 ( sd 16.6 ) , mean Tegner activity score 2.8 ( sd 1.1 ) . For the entire cohort , the mean maximum flexion was 130 ° at the time of final review . The incidence of implant-related re-operations was 2.9 % ; of these 29 re-operations two were revisions requiring revision knee replacement components with stems and wedges , 17 were conversions to a primary total knee replacement , six were open reductions for dislocation of the bearing , three were secondary lateral UKRs and one was revision of a tibial component . The most common reason for further surgical intervention was progression of arthritis in the lateral compartment ( 0.9 % ) , followed by dislocation of the bearing ( 0.6 % ) and revision for unexplained pain ( 0.6 % ) . If all implant-related re-operations are considered failures , the ten-year survival rate was 96 % ( 95 % confidence interval , 92.5 to 99.5 ) . If only revisions requiring revision components are considered failures the ten-year survival rate is 99.8 % ( confidence interval 99 to 100 ) . This is the largest published series of  UKRs  implanted through a minimally invasive surgical approach and with ten-year survival data . The survival rates are similar to those obtained with a st and ard open approach whereas the function is better . This demonstrates the effectiveness and safety of a minimally invasive surgical approach for implanting the Oxford UKR The literature contains limited yet controversial information regarding whether a fixed or a mobile bearing implant should be used in unicompartmental knee arthroplasty ( UKA ) . This r and omized study was to further document the performance and comparison of the two design s. Fifty-six knees in 48 patients ( mean age of 72 years ) undergoing medial UKA were r and omized into a fixed bearing ( Miller/Galante ) or a mobile bearing ( Oxford ) UKA . The 2 year clinical outcomes ( clinical scores ) , radiographic findings , and weight bearing knee kinematics ( assessed using RSA ) were compared between the two groups . The mobile bearing knees displayed a larger and an incrementally increased tibial internal rotation ( 4.3 degrees , 7.6 degrees , 9.5 degrees vs. 3.0 degrees , 3.0 degrees , 4.2 degrees respectively at 30 degrees , 60 degrees , 90 degrees of knee flexion ) compared to the fixed ones . The medial femoral condyle in the mobile bearing knees remained 2 mm from the initial position vs. a 4.2 mm anterior translation in the fixed bearing knees during knee flexion . The contact point in the mobile bearing implant moved 2 mm posteriorly vs. a 6 mm anterior movement in the other group . The mobile bearing knees had a lower incidence of radiolucency at the bone implant interface ( 8 % vs. 37 % , p < 0.05 ) . The incidence of lateral compartment OA and progression of OA at patello-femoral joint were equal . No differences were found regarding Knee Society Scores , WOMAC , and SF-36 scores ( p > 0.05 ) . This study indicates that mobile bearing knees had a better kinematics , a lower incidence of radiolucency but not yet a better knee function at 2 years Aims The interest in unicompartmental knee arthroplasty ( UKA ) for medial osteoarthritis has increased rapidly but the long-term follow-up of the Oxford UKAs has yet to be analysed in non- design er centres . We have examined our ten- to 15-year clinical and radiological follow-up data for the Oxford Phase III UKAs . Patients and Methods Between January 1999 and January 2005 a total of 138 consecutive Oxford Phase III arthroplasties were performed by a single surgeon in 129 patients for medial compartment osteoarthritis ( 71 right and 67 left knees , mean age 72.0 years ( 47 to 91 ) , mean body mass index 28.2 ( 20.7 to 52.2 ) ) . Both clinical data and radiographs were prospect ively recorded and obtained at intervals . Of the 129 patients , 32 patients ( 32 knees ) died , ten patients ( 12 knees ) were not able to take part in the final clinical and radiological assessment due to physical and mental conditions , but via telephone interview it was confirmed that none of these ten patients ( 12 knees ) had a revision of the knee arthroplasty . One patient ( two knees ) was lost to follow-up . Results The mean follow-up was 11.7 years ( 10 to 15 ) . A total of 11 knees ( 8 % ) were revised . The survival at 15 years with revision for any reason as the endpoint was 90.6 % ( 95 % confidence interval ( CI ) 85.2 to 96.0 ) and revision related to the prosthesis was 99.3 % ( 95 % CI 97.9 to 100 ) . The mean total Knee Society Score was 47 ( 0 to 80 ) pre-operatively and 81 ( 30 to 100 ) at latest follow-up . The mean Oxford Knee Score was 19 ( 12 to 40 ) pre-operatively and 42 ( 28 to 55 ) at final follow-up . Radiolucency beneath the tibial component occurred in 22 of 81 prostheses ( 27.2 % ) without evidence of loosening . Conclusion This study supports the use of UKA in medial compartment osteoarthritis with excellent long-term functional and radiological outcomes with an excellent 15-year survival rate . Cite this article : Bone Joint J 2016;98-B(10 Suppl B):41–7 AIMS The Advance Medial-Pivot total knee arthroplasty ( TKA ) was design ed to reflect contemporary data regarding the kinematics of the knee . We wished to examine the long-term results obtained with this prosthesis by extending a previous evaluation . PATIENTS AND METHODS We retrospectively evaluated prospect ively collected data from 225 consecutive patients ( 41 men and 184 women ; mean age at surgery 71 years , 52 to 84 ) who underwent 284 TKAs with a mean follow-up of 13.4 years ( 11 to 15 ) .  Implant failure , complication rate , clinical ( both subjective and objective ) and radiological outcome were assessed . Pre- and post-operative clinical and radiographic data were available at regular intervals for all patients . A total of ten patients ( 4.4 % ; ten TKAs ) were lost to follow-up . RESULTS Survival analysis at 15 years showed a cumulative success rate of 97.3 % ( 95 % confidence interval ( CI ) 96.7 to 97.9 ) for revision for any reason , of 96.4 % ( 95 % CI 95.2 to 97.6 ) for all operations , and 98.8 % ( 95 % CI 98.2 to 99.4 ) for aseptic loosening as an end point . Three TKAs ( 1.06 % ) were revised due to aseptic loosening , two ( 0.7 % ) due to infection , one ( 0.35 % ) due to instability and one ( 0.35 % ) due to a traumatic dislocation . All patients showed a statistically significant improvement on the Knee Society Score ( p = 0.001 ) , Western Ontario and McMaster University Osteoarthritis Index ( p = 0.001 ) , Short Form-12 ( p = 0.01 ) , and Oxford Knee Score ( p = 0.01 ) . A total of 207 patients ( 92 % ) were able to perform age appropriate activities with a mean flexion of the knee of 117 ° ( 85 ° to 135 ° ) at final follow-up . CONCLUSION This study demonstrates satisfactory functional and radiographic long-term results for this implant . Cite this article : Bone Joint J 2016;98-B:1050 - 5 PURPOSE OF THE STUDY Mobile-bearing total knee arthroplasty has become increasingly popular over the last few years since this option presents several theoretical advantages compared with the fixed-bearing models . The clinical advantage remains to be demonstrated . We therefore conducted a prospect i ve r and omized trial to ascertain the potential benefits . MATERIAL AND METHODS This study included patients treated by three senior orthopedic surgeons . Each group included 52 prostheses in 52 patients in the fixed-bearing group and 50 patients in the mobile-bearing group . The per- and postoperative protocol s were the same for both groups . Implants were cemented in all cases and patellae were resurfaced . The SF-12 , the Knee Society Score ( KSS ) , the Hospital of Special Surgery score ( HSS ) and pain and joint motion were noted before and after surgery . RESULTS Among the 104 prostheses implanted , 100 were review ed at mean follow-up of 36 months ( range 24 - 41 ) . One patient in the fixed-bearing group died six months after surgery from an unrelated cause . Three patients were lost to follow-up : one in the fixed-bearing group and two in the mobile-bearing group . There was no difference between groups for the SF-12 , KSS , HSS , pain and joint motion measured postoperatively . Postoperative femorotibial alignment was one degree varus on average in the fixed-bearing group and zero degree in the mobile-bearing group . At last follow-up , there were no radiological signs of prosthesis loosening . One patient in the fixed-bearing group developed a deep venous thrombosis , complicated by pulmonary embolism . Two of the mobile-bearing prostheses were revised , one for patellar fracture caused by a bicycle accident and one for prosthesis infection in a patient with endocarditis 1.5 years after implantation . DISCUSSION The clinical results were similar for the two groups in terms of function , pain , general status and complications . The outcome at 36 months was considered excellent or good in 90 % of the fixed-bearing group and 88 % in the mobile-bearing group . This study did not reveal any difference between the two groups regarding maximal flexion and anterior knee pain , two parameters which would theoretically show short-term improvement with the mobile bearing . Mid- and long-term follow will be required to confirm these findings and to determine the survival of these two types of implants Purpose The purpose of this study was to assess the midterm results of total knee arthroplasty ( TKA ) implanted with  a specific computer navigation system in a group of patients ( NAV ) and to assess the same prosthesis implanted with the conventional technique in another group ( CON ) ; we hypothesized that computer navigation surgery would improve implant alignment , functional scores and survival of the implant compared to the conventional technique . Methods From 2008 to 2009 , 225 patients were enrolled in the study and r and omly assigned in CON and NAV groups ; 240 consecutive mobile-bearing ultra-congruent score ( Amplitude , Valence , France ) TKAs were performed by a single surgeon , 117 using the conventional method and 123 using the computer-navigated approach .  Clinical outcome assessment was based on the Knee Society Score ( KSS ) , the Hospital for Special Surgery Knee Score and the Western Ontario Mac Master University Index score . Component survival was calculated by Kaplan – Meier analysis . Results Median follow-up was 6.4 years ( range 6–7 years ) . Two patients were lost to follow-up . No differences were seen between the two groups in age , sex , BMI and side of implantation . Three patients of CON group referred feelings of instability during walking , but clinical tests were all negative . NAV group showed statistical significant better KSS Score and wider ROM and fewer outliers from neutral mechanical axis , lateral distal femoral angle , medial proximal tibial angle and tibial slope in post-operative radiographic assessment . There was one case of early post-operative superficial infection ( caused by Staph . Aureus ) successfully treated with antibiotics . No mechanical loosening , mobile-bearing dislocation or patellofemoral complication was seen . At 7 years of follow-up , component survival in relation to the risk of aseptic loosening or other complications was 100 % . There were no implant revisions . Conclusion This study demonstrates superior accuracy in implant positioning and statistical significant better functional outcomes of computer-navigated TKA . Computer navigation for TKAs should be used routinely in primary implants . Level of evidence II Background A knee design with a ball- and -socket articulation of the medial compartment has a femoral rollback profile similar to the native knee . Compared to a conventional , posterior-stabilized knee design , it provides AP stability throughout the entire ROM . However , it is unclear whether this design difference translates to clinical and functional improvement . Questions / purpose sWe asked whether the medially conforming ball- and -socket design differences would be associated with ( 1 ) improved ROM ; and ( 2 ) improved American Knee Society , WOMAC , Oxford Knee , SF-36 , and Total Knee Function Question naire scores compared to a conventional , fixed-bearing posterior-stabilized TKA . Patients and Methods We enrolled 82 patients in a single-center , single-blinded , r and omized , controlled trial comparing the medially conforming ball- and -socket design knee prosthesis to a posterior-stabilized total knee prosthesis .  Our primary end point was ROM . Our secondary end points were American Knee Society , WOMAC , Oxford Knee , SF-36 , and Total Knee Function Question naire scores . All patients were followed at 1 and 2 years . Results The mean ROM was 100.1 ° and 114.9 ° in the posterior-stabilized and medially conforming ball- and -socket groups , respectively . The physical component scores of SF-36 and Total Knee Function Question naire were better in the medially conforming ball- and -socket group . We found no difference in American Knee Society , WOMAC , and Oxford Knee scores . Conclusions Both implant design s similarly relieved pain and improved function . The medially conforming ball- and -socket articulation provided better high-end function as reflected by the Total Knee Function Question naire . Level of Evidence Level I , therapeutic study . See Guidelines for Authors for a complete description of levels of evidence We prospect ively evaluated a consecutive series of 56 patients with unicompartmental knee arthritis who underwent unicompartmental knee replacement or total knee arthroplasty and received an average of 52months of follow-up . These patients were enrolled in a prospect i ve r and omized clinical trial . There were no significant differences in the pre-operative parameters of both groups . All the patients were followed up and evaluated preoperatively and yearly , the data was collected and statistical analysis was performed . At an average of 52months after surgery the mean Knee Society score was 80.5 ( range : 70 - 100 ) and 78.9 ( range : 70 - 87 ) for Unicompartmental knee replacement and total knee arthroplasty , mean range of postoperative motion for TKA is 115(0)±4(0 ) and 117(0)±7(0 ) for the group of UKA , with the numbers available , the difference between the two groups could not be shown to be significant . The average operation time of UKA and TKA is 68.8min and 81.5min(p<0.01 ) . Blood drainage after operation had a significant difference between the two groups ( p<0.01 ) . Seven cases of UKA were converted to total knee arthroplasty - all of them within the first 2years of starting the procedure and all of them in relatively young patients . From the study we concluded that mobile bearing UKA can obtain similar clinical effect with TKA by surgeons who have the adequate training and experience . After the learning curve UKA should be considered the primary treatment option for unicompartmental knee arthritis Purpose . To compare the mid-term clinical outcomes in Indian patients after total knee arthroplasty ( TKA ) using a fixed- or mobile-bearing prosthesis . Methods . 120 consecutive patients ( 50 men and 70 women ) aged 55 to 76 ( mean , 63 ) years who had arthritis of the knee with similar deformity and range of motion were r and omised to undergo TKA using a fixed- or mobile-bearing prosthesis .  Patients with mediolateral instability and infective arthritis were excluded .  Knee Society knee and functional scores , range of motion , and the presence of flexion contracture were assessed . Results . The mean follow-up duration was 3.5 ( range , 1–4.6 ) years . The mid-term outcome of the 2 groups was comparable . One patient with a mobile-bearing prosthesis had recurrent dislocation at postoperative week 2 , owing to iatrogenic medial collateral ligament injury . Conclusion . Long-term studies of both functional and radiological outcomes are needed to determine the indications for fixed- versus mobile-bearing prostheses We present the peak outcome results of the Oxford medial unicompartmental arthroplasty through a minimally invasive surgical incision . This prospect i ve study included 78 Oxford medial unicompartmental knee replacements in 68 patients . At the 2 year review the patients achieved a mean Oxford Knee Score of 38.3 . This was not significantly different to the 2 year results of the phase 2 Oxford knee carried out using a st and ard parapatellar approach when patients achieved a mean OKS of 36.0 . Four unicompartmental knee replacements required revision for unexplained pain , deep infection , aseptic loosening and bearing dislocation .  Minimally invasive joint replacement is attractive to both patients and surgeons , but is technically dem and ing with complications inherent to limited access
Conclusions Although total reoperation rates did not differ in the two population s , reoperation for bearing dislocation was more likely to occur in Asian than in Western patients , whereas reoperation for lateral knee OA progression was more likely to occur in Western than in Asian patients after Oxford Phase III UKA .
Background Implant survivorship is reported to be lower and complications , particularly bearing dislocation , are reported to be more frequent in Asian than in Western patients with medial knee osteoarthritis ( OA ) undergoing Oxford ® Phase III unicompartmental knee arthroplasty ( UKA ) .
To date , however , these complications have not been compared between these groups of patients .
Questions / purpose s The purpose of this study was to perform a meta- analysis comparing the st and ardized incidence rates of ( 1 ) all-cause reoperation ; ( 2 ) reoperation related to bearing dislocation ; and ( 3 ) reoperation related to progression of lateral compartment arthritis in Asian and Western patients with medial knee OA who underwent Oxford Phase III UKA .