i think there is no correlation with sciatica but for back pain perhaps the position between chirurgicale act

Dear Jack,

From our point of view there definately might be a correlation, which can work two way's:

First, surgical interventions in the abdominal region might affect control of the abdominal muscles. These muscles play an important rol in spine control (diverse literature). Thus, altered activation of the abdominal muscles affects spine and pelvic  control. Disturbed control in this area might induce complaints.

Second, lumbar of pelvic problems affect control of the abdominal muscles (transverse abdominis). Disturbed control of this abdominal muscle might weaken the abdominal wall. This renders the abdominal wall vulnerable at moments of pressure build up. It is the assumption that this might contribute to the onset of umbilical herniation (or diastasis recti). So from this perspective lumbar complaints might be the cause of the cycle.

In the specification of your question your refer to one sides problems. When the complaints are in the pelvis the sciatics might be caused by a hypertone piriformis muscle. This muscle can be over activated as compensation strategy for disturbed pelvic control. 

From our perspective there is a close relation between proper abdominal function and control of the spine. 

A PMR colleague working on spine observed that some patients altered and/or developed low back pain into the two years after an abdominal intervention.

Reasons are not clear but I agree with the two points developed by JP van Wingerden.

Hi 

Any abdominal surgery can affect the oval of muscles around the abdomen from rectus, obliques, transversus and the axial back muscles like the 3 parts of erector spinae and the psoas. Spasms or myofascial bands in the latter two determine  whether the spinal nerve roots get entrapment syndromes. 

 In addition most of visceral pains are refferred to the back muscles as well as the muscles of abdominal oval  causing Myofascial triggers in these muscles. This gives rise to back pain which can eventually lead to sciatica by entrapment of L4-5 nerve roots by the myofascial bands in the axial back muscles .

I have elaborated on these concepts in the article .

       " L Vas, Phanse S, Pai R. A new perspective of neuromyopathy to explain intractable Pancreatic cancer pains; proposal of  a new rationale to include dry needling as an effective adjunct to neurolytic blocks or thermoablative procedures for a comprehensive interventional management.” Indian Journal of Palliative care 2016;22:85-93" 

This article explains why back pain can be the result of visceral pains not just in cancer but also benign abdominal pain . 

If your patient had pain because of the umbilical hernia his back pain becomes easy to explain.  If he had no pain prior to the umbilical surgery he could still get back issues as a part of  post surgical  neuropathic pain involving the motor nerves supplying his back muscles. I see  back issues after many types of abdominal surgery from herna , appendicectomy, C section and  hysterectomy.  

In addition to the reply of Lakshmi:

The abdomen functions as a pressure system. Control of and variation in pressure is essential for a number of functions like breathing, intestine function, spine control etc.

Operations in the abdominal area disrupt this pressure function. There may be several reasons, but one important one is that surgery disrupts the integrity of the abdominal wall. The body responds by suppressing build up of proper abdominal pressure. IN a chain of action this may lead to other complaints like back pain, bowel dysfunction, breathing disorders etc.

Abdominal muscles andErector Spinae muscles balance each other so any type of Abdominal surgery will disturb the balance thus leading to back pain , some time gastric ulcer or pancreatic lesion can lead to back pain