Study	Reason for exclusion
Adams 1990	Quasi‐randomized: allocated according to the day of surgery (even or uneven)
Darling 1994	No outcome of interest
Lattermann 2005	Different population: elective surgery for primary total hip arthroplasty
Messaoudi 2009	No outcome of interest
Ungemach 1987	A randomized trial of 50 hip fracture patients using either enflurane or enflurane and fentanyl. The trial was excluded as it was a comparison of different drugs within one type of anaesthesia (general anaesthesia) and not a comparison of different anaesthetic techniques
Yao 1997	Different intervention. Study on two different speeds of injection of the local anaesthetic for spinal anaesthesia