Chronic lumbar paraspinal compartment syndrome: a case report and review of the literature. 
A 25-year-old male weightlifter felt increasing intractable low back pain during training but denied any acute injury.  The physical examination, blood parameters, radiographs and MRI were unremarkable.  He had been treated non-operatively by various means, with only temporary relief.  The pressures in the lumbar paraspinal compartment were abnormally high and he was treated by surgical decompression.  This gave rapid relief, he returned to training, and one year later the pain had not recurred.