Cervical spondylotic amyotrophy treated by anterior decompression. Three case reports.

Cervical spondylotic amyotrophy (CSA) is a rare type of cervical spondylotic disorder. The surgical treatment of CSA is controversial. We treated three patients with the proximal type of CSA by anterior decompression. Three men (65, 61, and 58 years old) presented with CSA manifesting as unilateral muscle weakness and atrophy in the deltoid and biceps muscles without significant sensory deficit. Preoperative neuroradiological examinations revealed anterolateral spinal cord compression in one patient and ventral root compression in two patients at the C4-5 and C5-6 spaces. Magnetic resonance (MR) imaging showed no abnormal intramedullary signal intensity in any patient. Vertebrotomy deviated to the lesion side was performed to provide a better view of the laterally situated osteophytes. Anterior decompression was focused on the paramedial to lateral area, and further foraminotomy was performed according to the radiological findings. After decompression, intervertebral instrumentation was performed using titanium cervical cages. Two of the patients had good recovery of motor strength and one had moderate recovery despite persistent motor atrophy. Surgical intervention is effective in patients with CSA despite severe muscle atrophy unless MR imaging shows the presence of severe degenerative intramedullary lesion.