Wijgman 1994.

Methods	Randomised parallel group trial.
Participants	64 participants undergoing total hip replacement (48 women, 16 men; mean age 65 years, range 42 to 85). Inclusion criteria: primary coxarthrosis confirmed by X‐ray. Exclusion criteria: pathological malformations (other than hip problems) that could interfere with rehabilitation. Location: Maastricht, Netherlands.
Interventions	Intervention group (n = 31) received preoperative instructions (30 minutes) in groups of 4‐6 delivered by 2 physiotherapists as well as preoperative exercise therapy including muscle‐setting exercises. Control group (n = 33) not described.
Outcomes	Days to mobilisation (standing, walking and climbing stairs); length of hospital stay; pain (medication). Participants were assessed preoperatively and 7, 10 and 14 days postoperatively.
Notes	Publication is written in Dutch and was translated into English.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Quote: "The patients... were divided at random..." Comment: sequence generation not described.
Allocation concealment (selection bias)	Unclear risk	Comment: method of allocation not described.
Blinding (performance bias and detection bias) Self‐reported outcomes	High risk	Comment: no description of any attempt to blind participants and blinding is unlikely to have been possible.
Blinding (performance bias and detection bias) Objective outcomes	Unclear risk	Comment: no description of blinding of trial personnel; mobilisation and length of stay could have been influenced by awareness of a participant's assignment.
Incomplete outcome data (attrition bias) All outcomes	Low risk	Adequate description of withdrawals.
Selective reporting (reporting bias)	Unclear risk	Comment: outcome data were only presented as box plots, and attempts to retrieve means and SDs were successful. All outcomes listed in the methods were reported in the results, but without the trial protocol, it is unclear whether any other outcomes were measured but not reported based on the results.
Other bias	Low risk	Comment: no other sources of bias identified.

IQR: interquartile range; SD: standard deviation; SF‐36: 36‐item Short Form; VAS: visual analogue scale; WOMAC: Western Ontario and McMaster Universities Osteoarthritis Index.