A 28-year-old male asked:
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low back + distal lt. leg pain. mri negative but emg/ncs says pinched nerves l4-l5 and s1. what can cause this?

2 doctor answers
Dr. Paul Grin
Dr. Paul Grin answered
36 years experience Pain Management
Nerve impingement: can be caused by being sandwiched between two spinal bones, pressed by a bulging. It can cause muscle spasm and back pain. Prevention treatment is always recommended. This condition must be professionally managed. See interventional pain management specialist for definitive diagnosis and management. It is the same as a pinched nerve.
Answered on Jul 3, 2014
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Dr. Qamar Khan
17 years experience Pain Management
Still the spine: Sometimes MRI can be inconclusive but if EMG suggests its the L4, L5 and/or S1 nerve roots, then you have at least an answer that the spine may still be the cause of your back and leg pain. Vice versa, EMGs can also be inconclusive and MRI shows what the pathology is. I would suggest you see a try pain/spine specialist who can best treat you because MRI images may need full evaluation.
Answered on Sep 28, 2016
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2 comments
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Dr. Qamar Khan
Dr. Qamar Khan commented
17 years experience Pain Management
Provided original answer
Agree
Jul 2, 2014
Dr. Ali Saberi
Dr. Ali Saberi commented
20 years experience Internal Medicine
the cause is usually a herniated disk that has then placed pressure on the nerves exiting the tiny holes=foramen. Bone spurs can do it too. Degeneration of disks is unfortunately common, but when adding more pressure in the lower back, they tend to be affected sooner-like trauma, long term manual labor, athletes, etc..Usually MRI would should a large herniation, but won't always pick up bone spurs
Jul 2, 2014

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