We did not find any differences between PSI and SI with respect to any other parameters .
Conclusions PSI  has advantages in axial alignment of the femoral component , operative time , and perioperative blood loss relative to SI .
No significant differences were found between PSI and SI with respect to alignment of the remaining components , number of outliers , or length of hospital stay .
Purpose The purpose of the present study was to compare patient-specific instrumentation ( PSI ) with st and ard instrumentation ( SI ) in patients undergoing total knee arthroplasty ( TKA ) .
PSI is hypothesized to have advantages with respect to component alignment ; number of outliers ( defined as alignment > 3 ° from the target alignment ) ; operative time ; perioperative blood loss ; and length of hospital stay .
This new surgical technique is expected to exhibit superior performance .
No difference in clinical outcome between patient-matched positioning guides and conventional instrumented total knee arthroplasty two years post-operatively: a multicentre, double-blind, randomised controlled trial.
AIMS We wished to compare the clinical outcome , as assessed by question naires and the rate of complications , in total knee arthroplasty ( TKA ) undertaken with patient-matched positioning guides ( PMPGs ) or conventional instruments . PATIENTS AND METHODS A total of 180 patients ( 74 men , 106 women ; mean age 67 years ) were included in a multicentre , adequately powered , double-blind , r and omised controlled trial . The mean follow-up was 44 months ( 24 to 57 ) . RESULTS There were no significant or clinical ly relevant differences between the two groups for all outcome measures ( Knee Society Score , p = 0.807 ; Oxford Knee Score , p = 0.304 ; Western Ontario and McMaster osteoarthritis index , p = 0.753 ; visual analogue scale for pain , p = 0.227 ; EuroQol-5D-3L index score , p = 0.610 ; EuroQol-5D-3L VAS health , p = 0.968 . ) There was no difference in the rate of complications ( p = 0.291 ) . CONCLUSION PMPGs are already in relatively common use and their short-term clinical results are equal to conventional instrumented TKA . Cite this article : Bone Joint J 2016;98-B:939 - 44
We did not find any differences between PSI and SI with respect to any other parameters .
Conclusions PSI  has advantages in axial alignment of the femoral component , operative time , and perioperative blood loss relative to SI .
No significant differences were found between PSI and SI with respect to alignment of the remaining components , number of outliers , or length of hospital stay .
Purpose The purpose of the present study was to compare patient-specific instrumentation ( PSI ) with st and ard instrumentation ( SI ) in patients undergoing total knee arthroplasty ( TKA ) .
PSI is hypothesized to have advantages with respect to component alignment ; number of outliers ( defined as alignment > 3 ° from the target alignment ) ; operative time ; perioperative blood loss ; and length of hospital stay .
This new surgical technique is expected to exhibit superior performance .