Mechanical and thermal pain threshold were measured by paw withdrawal latencies to von Frey hair and radiant heat stimulation at 1 d before operation (baseline) and 1, 3, 5, 7 d after operation.

• 分别于术前1 d(基础值)、术后1、3、5、7 d测定大鼠的机械痛阈和热痛阈。