Moharari 2008.

Methods	Prospective randomized controlled trial.
Participants	Patients between the ages of 18 and 80 years with anterior shoulder dislocation.
Interventions	The IAL group received an intra‐articular injection of 20 ml of 1% lignocaine into the affected shoulder. The IVAS group, intravenous meperidine 25 mg and diazepam 5mg over 1 to 2 minutes.
Outcomes	Outcome measures were: pain before injection, pain before joint reduction, pain after joint reduction, number of reduction attempts, duration of emergency department stay, duration of reduction and complications.
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Quote: “Patients were randomly assigned into two groups using a computer random number generator”.
Allocation concealment (selection bias)	High risk	Published study does not provide any information regarding allocation concealment. Comment: the nature of the interventions is such that allocation concealment is not feasible.
Blinding (performance bias and detection bias) All outcomes	High risk	Quote: “non‐blind”. Comment: the nature of the interventions is such that blinding is not feasible.