Cemented and uncemented tibial components had different migration patterns .
For cemented tibial components there was no difference in migration between all-poly and metal-backed components , between mobile bearing and fixed bearing , between cruciate retaining and posterior stabilized .
Furthermore , no difference existed between TKR measured with model-based RSA or marker-based RSA methods .
For uncemented TKR there was some variation in migration with the highest migration for uncoated TKR .
Interpretation - The results from this meta- analysis on  RSA migration of TKR  are in line with both the survival analyses results from joint registries of these TKRs as well as revision rates results from meta-analyses , thus providing further proof for the association between early migration and late revision for loosening .
Purpose - We performed a systematic review and meta-analyses to evaluate the early and long-term migration patterns of  tibial components of TKR of all known RSA studies .
The effect of tourniquet use on fixation quality in cemented total knee arthroplasty a prospective randomized clinical controlled RSA trial.
BACKGROUND A concern that arises with any change in technique is whether it affects the long-term implant stability . The objective of this study was to evaluate the early migration , measured by radiostereometric analysis ( RSA ) , and the functional outcome of the Triathlon ™ cemented knee prosthesis , operated on with or without a tourniquet . During the last decades RSA has emerged as a way to assess prosthetic fixation and long time prognosis . The method has been used extensively in both hip and knee arthroplasty . METHOD This was a single centre prospect i ve study including 60 patients r and omized into two groups operated on either with or without tourniquet .  RSA investigation was done within 2 - 3 days postoperatively after full weight bearing , and then at 3 months , 1 year and 2 years postoperatively . RESULTS There were no differences between the groups regarding the translation along or rotation around the three coordinal axes , or in maximum total point motion ( MTPM ) . At 2 years the mean MTPM ( SD ) was 0.71 mm ( 0.64 ) for the tourniquet-group and 0.53 mm ( 0.21 ) for the non-tourniquet-group . CONCLUSIONS The tibial tray of the Triathlon ™ cemented knee prosthesis showed similar early stability whether operated on with or without tourniquet . LEVEL OF EVIDENCE Level I. ARTICLE SUMMARY Article focus : A safety study for total knee replacement operated on with or without perioperative tourniquet regarding the prosthetic fixation . Strengths and limitations : Strength of this study is that it is a r and omized prospect i ve trial using an objective measuring tool . The sample size of 25 - 30 patients is reportedly sufficient for the screening of implants using RSA ( 1 - 3 ) . TRIAL REGISTRATION Clinical trials NCT01604382 , Ethics Committee approval D-nr : 144/20085
Cemented and uncemented tibial components had different migration patterns .
For cemented tibial components there was no difference in migration between all-poly and metal-backed components , between mobile bearing and fixed bearing , between cruciate retaining and posterior stabilized .
Furthermore , no difference existed between TKR measured with model-based RSA or marker-based RSA methods .
For uncemented TKR there was some variation in migration with the highest migration for uncoated TKR .
Interpretation - The results from this meta- analysis on  RSA migration of TKR  are in line with both the survival analyses results from joint registries of these TKRs as well as revision rates results from meta-analyses , thus providing further proof for the association between early migration and late revision for loosening .
Purpose - We performed a systematic review and meta-analyses to evaluate the early and long-term migration patterns of  tibial components of TKR of all known RSA studies .