Major lumbar spine surgeries are associated with severe postoperative pain that usually lasts for at least 3 days.Caudal epidural analgesia has a crucial role in providing effective pain relief post lumbar spine surgeries by blocking sensory input at the level of the spinal cord. Erector Spinae Plane Block (ESPB) as a new technique of trunk fascia block was proposed in 2016Reports showed that ESPB significantly relieved postoperative pain in patients with lumbosacral spine surgery, reducing the use of analgesics. The aim of this work is to evaluate the pre-emptive analgesic effect of Ultrasound guided bilateral erector spinae block Vs Caudal epidural analgesia in Lumbar spine surgeries during peri-operative period. Objectives: * To assess the duration of analgesia in both groups and time to rescue analgesia . * To assess Visual analogue scale (VAS) score in both groups. * To assess complications of both groups
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time to first analgesia request
Timeframe: 12 hours