A nerve block should be co-administered with general anaesthesia (femoral, fascia iliaca, psoas compartment block or local anaesthesia infiltration).
Co-administration of a nerve block
- reduces age-adjusted maintenance doses of general anaesthesia
- reduces opioid analgesia requirements postoperatively 
Compared to fascia iliaca and femoral nerve block, psoas compartment block more reliably anaesthetises the lateral cutaneous nerve of the thigh (ie where hip fracture incisions are made) 
The hip joint is innervated postero-inferiorly by braches of the sciatic nerve, and so additional analgesia (eg local anaesthesia infiltration) may be required for total hip replacement.
The effectiveness of local anaesthesia infiltration is operator-dependant.
1. Parker MJ, Griffiths R, Appadu BN. Nerve blocks (subcostal, lateral cutaneous, femoral, triple, psoas) for hip fractures. Cochrane Database of Systematic Reviews 2002; 1: CD001159.
2. Mannion S. Psoas compartment block. Continuing Education in Anaesthesia, Critical Care and Pain 2007; 7: 162-6.