Abstract: Objective  To compare the effect of an equal dose of ropivacaine and levobupivacaine on lumbar plexus block in aged patients undergoing PFNA. 
Methods  A total of 60 patients undergoing elective unilateral PFNA surgery were enrolled. Inclusion criteria were American Society of Anesthesiologists(ASA) medical status of Ⅰ or Ⅱ and age of 65 to 95 years. The patients were divided into group L(n=30) and group B(n=30) by random number table. Both group underwent the lumbar plexus block guided by ultrasound combined with nerve stimulator, and group L and group B were injected with 25 mL of 0.375% ropivacaine and 25 mL of 0.375% levobupivacaine respectively. The onset time of sensory block and motor block, duration of sensory block and motor block, resting VAS values at 6 h, 12 h, 24 h and 48 h after surgery were compared for patients in each group, and analgesia pump use within 48 h after operation and the incidence of adverse reactions were recorded. 
Results  The duration of sensory block and motor block was significantly shorter in group L than in group B(P＜0.05). The VAS scores of all two groups were increased initially and then decreased, and the increase in group B was significantly less than that in group L. The differences of interaction betweengroups, time points and time points between groups were statistically significant(P＜0.05). The time of first pressing analgesia pump was significantly shorter in group L than in group B(P＜0.05). 
Conclusion  An equal dose of ropivacaine and levobupivacaine has a good analgesic effect on lumbar plexus block for elderly patients undergoing PFNA, and the block onset time is similar, however, duration of ropivacaine block is shorter than that of levobupivacaine, which is more conducive to the early activities of patientsand faster recovery after surgery, with better safety. Therefore, it is worthy of popularization.

Key words: lumbar plexus block, levobupivacaine, ropivacaine, PFNA, aged patients