This is a prospective, monocentric, randomized study, comparing the effectiveness and tolerance of four different dosages of hypobaric ropivacaine for unilateral spinal anaesthesia during traumatic femoral neck surgery in the elderly.
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Determine the minimum effective ropivacaine dose for unilateral hypobaric spinal anaesthesia during traumatic femoral neck surgery.
Timeframe: 1 hour (surgery intervention)