This was a single centre prospective study including 60 patients randomized 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.
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.
The tibial tray of the Triathlon鈩?cemented knee prosthesis showed similar early stability whether operated on with or without tourniquet.
Level I.
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 randomized prospective 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.
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