Table 3.

Studies on hip restrictions after THA

Study	Level of evidence	Number of patients	Assessment points	Conclusion
Singelyn et al. [59] (2005)	I	45	Compared I.V. PCA, continuous epidural catheter and continuous femoral nerve block (cFNB)	Similar efficacy but fewer systemic side effects with cFNB
Andersen et al. [2] (2007)	I	75	Compared local infiltration analgesia (LIA) with epidural infusion	Lower VAS scores, shorter hospital stay and reduced nausea and vomiting with LIA
Parvataneni et al. [44] (2007)	I	131	Compared local periarticular injections to PCA ± FNB	Lower VAS pain scores, faster recovery with local periarticular injections
Siddiqui et al. [58] (2007)	I	34	Compared lumbar plexus block (LPB) to I.V. PCA	Lower VAS pain scores, reduced opioid requirement and less nausea, vomiting with LPB
Becchi et al. [4] (2008)	II	73	Compared continuous psoas compartment block (cPCB) to I.V. morphine/Ketorolac PCA	Lower VAS pain scores and less nausea, vomiting with cPCB