Hansson 2005.

Methods	RCT stated Randomisation technique not stated Duration of study: 2 years
Participants	No selection criteria stated; selection resulted in knee arthrosis grade II to IV Sweden: 42 participants (52 knees) Fixed: n = 27, 14 female, age 75 (64‐86) years Mobile: n = 25, 12 female, age 74 (60‐85) years
Interventions	Fixed: Niffield (Corin Medical) Mobile: Rotaglide, meniscal bearing (Corin Medical) Patellar resurfacing unclear Cementing unclear
Outcomes	RSA, ROM, alignment, HSS RSA: postoperative at 6 weeks and at 3 months, 6 months, 1 year and 2 years. Clinical scores: preoperative and at 1 and 2 years Average and range scores given
Notes	Study supported by Lund University and Corin Medical Ltd No declarations of interest reported
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Randomised allocation
Allocation concealment (selection bias)	Unclear risk	Not described
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	Participant blinding not described; surgeon not blinded
Blinding of outcome assessment (detection bias) All outcomes	High risk	Outcome assessor not blinded
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Drop‐out rate given and acceptable; not clear whether intention‐to‐treat analysis was used
Selective reporting (reporting bias)	Unclear risk	No protocol available
Other bias	Unclear risk	Unclear whether there was homogeneity in participant groups; co‐interventions described in sufficient detail