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Chapter Summary
• Context: Anterior approaches to the lumbar spine allow wide access to the disc space and anterior column with significant biomechanical advantages, but traverse complex anatomical territory. Iliac vessels, aorta, inferior vena cava, ureter, visceral organs, autonomic plexuses, peripheral nerves, and the abdominal wall itself can be compromised during exposure. Low complication frequencies do not reduce their gravity, as vascular or visceral injuries require immediate emergency intervention. The chapter categorizes complications into abdominal wall, vascular, visceral, neurological, and urogenital groups, providing detailed photographic and radiographic documentation of hematomas, iliac vein tears, arterial thromboses, internal hernias, retrograde ejaculation, and ureteral injuries.
• Chapter Objective: To enable the reader to recognize complications of anterior lumbar approaches, understand their anatomical basis, identify early and delayed clinical signs, and select appropriate diagnostic and therapeutic strategies. Preoperative vascular window planning and prevention of vascular, visceral, neural, and urogenital injuries are emphasized.
• Abdominal Wall ComplicationsHematomas and seromas arise from local bleeding or muscular disruption. Dehiscence and incisional hernias relate to fascial layers and closure technique. Injury to the iliohypogastric or ilioinguinal nerves causes muscular atony and abdominal wall pseudoparesis/bulging without true fascial defect. Meticulous layer-by-layer closure and anatomical plane preservation are essential.
• Vascular ComplicationsLeft common iliac vein and artery lie directly over L4-L5 and L5-S1. Venous laceration is the most common and dramatic intraoperative vascular event; arterial thrombosis, dissection, and embolization can also occur. Postoperatively, pulse asymmetry, leg pallor, cool extremities, or swelling require urgent Doppler ultrasound or CT angiography. Endovascular thrombectomy, stenting, or vascular repair may be required.
• Visceral ComplicationsIntestinal perforation, internal hernia through inadvertent peritoneal tears, and ischemic bowel are rare but life-threatening. Progressive abdominal distension, fever, or peritoneal signs demand immediate imaging and general surgical consultation. Small peritoneal tears must be identified and closed to prevent loop entrapment.
• Neurological and Autonomic ComplicationsRetraction injury to the femoral nerve, genitofemoral nerve, or lateral femoral cutaneous nerve produces groin/thigh dysesthesia or quad weakness. Superior hypogastric plexus disruption at L5-S1 causes retrograde ejaculation in males (up to 5-10%); lumbar sympathetic trunk injury at L2-L4 causes unilateral warm/dry foot syndrome (sympathectomy effect).
• Urogenital ComplicationsThe ureter is vulnerable during retroperitoneal mobilization, particularly in revision surgery or prior peritonitis. Unrecognized injury presents with urinoma, flank pain, or sepsis. Prompt urological stenting or repair is required.
• Clinical Application: Planning an anterior approach starts with vascular MRI/CT review: assessing bifurcation level, osteophytes, iliac vessel mobility, and prior retroperitoneal scarring. Intraoperatively, careful blunt dissection, gentle retraction, avoiding monopolar electrocautery over the L5-S1 disc (protecting hypogastric plexus), and identifying anomalous veins (ascending lumbar vein) are vital. Postoperatively, early examination of distal lower limb pulses, capillary refill, and abdominal tenderness detects vascular thrombosis or bowel injury early.
