[Summary text]
Selection bias (biased allocation to interventions) due to inadequate generation of a randomised sequence
Randomized by birth date
no details
no details
Fra Thorlund, 2015
Risk of selection bias
Fra Khan, 2014
Fra Thorlund, 2015
Selection bias (biased allocation to interventions) due to inadequate concealment of allocations prior to assignment
Not described
The allocation sequence was concealed from the orthopaedic
surgeon that enrolled and assessed participants. The allocations
were placed in sequentially numbered, opaque, sealed envelopes in
15 blocks, block size 10. Envelopes were opened after the enrolment
by the patient and a nurse.
no details
Fra Thorlund, 2015
Fra Thorlund, 2015
Fra Khan, 2014
Fra Thorlund, 2015
Performance bias due to knowledge of the allocated interventions by participants and personnel during the study
Not described
Envelopes were opened after the enrolment
by the patient and a nurse.
no blinding
Fra Thorlund, 2015
Fra Thorlund, 2015
Fra Khan, 2014
Fra Thorlund, 2015
Detection bias due to knowledge of the allocated interventions by outcome assessors
Not described
subjective outcomes (KOOS questionnaire)
subjective outcomes (KOOS questionnaires)
Fra Thorlund, 2015
Fra Thorlund, 2015
Fra Khan, 2014
Fra Thorlund, 2015
Attrition bias due to amount, nature or handling of incomplete outcome data
No statements of dropouts or analysis methods.
ITT analysis. Dropouts equally distributed. However, regarding crossover as dropouts, which is only possible for one group, there is high risk of attrition bias.
dropouts equally distributed. However, regarding crossover as dropouts, which is only possible for one group, there is high risk of attrition bias.
Fra Thorlund, 2015
Fra Thorlund, 2015
Fra Khan, 2014
Fra Thorlund, 2015
Reporting bias due to selective outcome reporting
Fra Thorlund, 2015
Fra Thorlund, 2015
Fra Khan, 2014
Fra Thorlund, 2015
Bias due to problems not covered elsewhere in the table
Detection and performance bias
Fra Thorlund, 2015
Fra Thorlund, 2015
Fra Khan, 2014
Fra Thorlund, 2015