The researchers want to investigate the effects of muscle relaxation with rocuronium bromide during general anaesthesia on muscle trauma (serum CK, CRP) and postoperative analgesic consumption in patients with total hip prosthesis replacement (general vs. spinal anaesthesia).

Inclusion Criteria:

1. patient agreement
2. indication for total hip replacement
3. age 55 - 80 years
4. weight 65 - 95 kg
5. first intervention
6. ASA classification I - III
7. general and spinal anaesthesia possible in this patient

Exclusion Criteria:

a) neuromuscular diseases b) surgery with muscle trauma (within the last 3 months) c) permanent immobility d) intramuscular injections (within the last 4 weeks) e) medication with opioids f) medication with co-analgetics g) contraindications for general or spinal anaesthesia h) dementia, cognitive dysfunction or sleep apnea

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