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Hi Doctor
As always this is a great site I still have problems with my lower back seen surgon and she has told me that i need a fusion at L5/S1 because I have stenios at that level but my question is that a have numbness on the front of left thigh since my last operation on the 19/5/2011 for a decompression surgery on L5/S1 my surgion sent me for a nerve test and I have only about 10% feeling in the left thigh with a bit of a ache in that area to cut a long story short from what i can gather this is caused from the fermoal nerve anyway i had a cortazone injection last Friday in the groin area .But I still have numbness there when they did the ultrascan on that area they said that nerve was really inflamed about double the size do you think the cotazone injection will work if it is that inflamed and is the problem caused from my lower back ? Again thanks doctor for the service you provide and your replys have kept me from going crazy and your information is spot on Thanks Again Doctor I wish you practice in australia.Numbness in the anterior thigh can be from irritation to the femoral nerve but after a spine surgery, I would have some suspicion of the lateral femoral cutaneous nerve as the culprit.
The L5-S1 level contains the L5 and the S1 nerves which are part of the sciatic nerve complex. These nerves radiates down the buttocks, back of the thigh and calf before ending in the foot. Surgery on this area generally would not cause anterior thigh numbness.
Surgical positioning typically places a supportive pad under the anterior thigh for spine surgery. The lateral femoral cutaneous nerve runs right underneath the inguinal ligament (Poupart’s to be exact) and can be compressed by positioning. This condition (called Meralgia Paresthetica) causes numbness of the anterior thigh. Since this particular nerve just causes sensory symptoms, you should have no motor symptoms (weakness or give-way of the leg).
If this is the case, symptoms are not dangerous and should slowly abate over a years period of time.
Dr. Corenman
PLEASE REMEMBER, THIS FORUM IS MEANT TO PROVIDE GENERAL INFORMATION ON SPINE ANATOMY, CONDITIONS AND TREATMENTS. TO GET AN ACCURATE DIAGNOSIS, YOU MUST VISIT A QUALIFIED PROFESSIONAL IN PERSON.
Donald Corenman, MD, DC is a highly-regarded spine surgeon, considered an expert in the area of neck and back pain. Trained as both a Medical Doctor and Doctor of Chiropractic, Dr. Corenman earned academic appointments as Clinical Assistant Professor and Assistant Professor of Orthopaedic Surgery at the University of Colorado Health Sciences Center, and his research on spine surgery and rehabilitation has resulted in the publication of multiple peer-reviewed articles and two books. -
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