La cause fonctionnelle de la sciatique

La sciatique s'accompagne souvent de maux de dos, que 80 % des Américains ressentiront à un moment donné de leur vie. Au moment où votre médecin vous diagnostique une sciatique, la cause peut sembler être structurelle, le plus souvent une hernie discale appuyant sur la racine du nerf sciatique.

However, as you’ll learn in this post, this structural issue begins with your function: how you’re sitting, standing, and moving every day, and the patterns of muscular tension that you develop as a result. Many cases of sciatica can be eliminated, and virtually all can be prevented, by releasing the chronic muscle tension in the lower back that compresses the lumbar discs and the sciatic nerve.

Qu'est-ce que la sciatique ?

The sciatic nerve is the largest and thickest nerve in the human body. Nerves exiting the spine between the fourth lumbar vertebra and the third sacral vertebra come together to form the sciatic nerve, which runs through the buttocks and all the way down each leg. The sciatic nerve is responsible for much of the sensation and motor control of the legs and feet.

Sciatica symptoms are generally caused when the nerves exiting the spine are compressed between the vertebrae by a bulging or herniated disc pressing against the nerve roots. Symptoms can also occur if the sciatic nerve is compressed after it has exited the spine. When your sciatic nerve is compressed you may experience the following symptoms:

• Douleur irradiant du bas du dos vers la hanche et le long de la jambe
• Douleur lancinante ou sensation de brûlure dans la jambe et le pied
• Douleur qui s'aggrave en position assise
• Picotements, engourdissements ou faiblesse dans la jambe et le pied
• Difficulté à bouger la jambe

In a small portion of the population, the sciatic nerve runs through a gluteal muscle called the piriformis instead of underneath it. For these people, chronic tightness in the piriformis can compress the sciatic nerve, causing piriformis syndrome. The symptoms of sciatica and piriformis syndrome are generally the same; the distinction is made based on where the nerve compression occurs.

Qu'est-ce qui cause la sciatique?

Dans environ 90 % des cas, la sciatique est causée par une hernie discale comprimant la racine du nerf sciatique. Les autres causes comprennent la discopathie dégénérative, la sténose spinale, le spondylolisthésis, la grossesse, les tumeurs ou les infections.

However, sciatica almost always begins as a functional issue. When tight lower back muscles constantly compress the lumbar spine, or when the lumbar spine is compressed repetitively by heavy lifting or poor body mechanics, structural changes begin to occur. Lumbar discs thin and herniate, vertebrae move out of alignment, the spinal canal may narrow, and bone spurs can develop.

These painful, sometimes permanent structural issues most often occur simply because of the way we use our bodies.

Certains signes avant-coureurs dont il faut être conscient sont :

• Tension ou douleur dans le bas du dos
• Légers picotements ou engourdissements occasionnels dans la jambe, le pied ou les orteils
• Mécanique corporelle ou posture déséquilibrée, comme une longueur de jambe inégale fonctionnelle ou une scoliose

Pourquoi développons-nous la tension musculaire chronique qui comprime la colonne lombaire ?

The lower back muscles are core muscles: the strong muscles at the center of our body that initiate and control our movement and posture.

Les mouvements de tout le corps commencent par le mouvement de notre bassin, effectué par nos muscles du bas du dos et de l'abdomen. Ces muscles centraux fournissent un contrôle et une stabilité essentiels lorsque nous nous déplaçons. Notre posture debout et assise se développe également en fonction de la façon dont nous tenons notre bassin lorsque nous ne bougeons pas.

Étant donné que nous utilisons toujours nos muscles du bas du dos et que nous leur demandons souvent d'effectuer des actions répétitives ou puissantes, il est très courant qu'ils deviennent chroniquement tendus. Voici pourquoi:

The movement and level of contraction of our muscles is controlled by our nervous system. The way that our muscles move, and how much we keep them contracted, is actually learned over time by our nervous system.

Our nervous system learns certain ways of using our muscles based on how we choose to stand and move each and every day. Our nervous system notices the postures and movements that we tend to repeat, and it gradually makes these postures and movements automatic so that we don’t have to consciously think about them. Part of this process of automation is that our nervous system starts keeping certain muscles partially contracted all the time—this saves us time and conscious attention in carrying out repetitive actions. (Really, our nervous system is trying to be helpful!)

This learning process—that of developing what we refer to as muscle memory—allows us to go through the activities in our daily lives easily and efficiently. Unfortunately, if we tend to repeat unnatural, potentially damaging postures or movements—like certain types of athletic training, heavy lifting, or repetitive daily activities like sitting at a desk or carrying our baby on one side—our nervous system will learn those too. Our automatic neuromuscular learning process doesn’t discern what is good or bad for us—it just notices what we tend to repeat, and makes it automatic.

As our nervous system gradually learns to keep our muscles tight, gamma loop activity adapts. This feedback loop in our nervous system regulates the level of tension in our muscles. As our brain keeps sending the message to contract our muscles, gamma loop activity adapts and increases the resting level of tension in our muscles. Meanwhile, our proprioception (how we sense our body) adapts so that we’re not aware of the increased level of tension in our muscles.

This innate process of muscular learning takes place throughout our lives. It typically happens so gradually that we’re not aware of it until we notice the effects: tightness, pain, unnatural posture, limited movement, or structural damage to our joints and connective tissues.

Comment utiliser Somatiques Cliniques exercices pour soulager la sciatique et le syndrome piriforme

Pour prévenir et atténuer le syndrome de la sciatique et du piriforme, vous devez relâcher la contraction musculaire chronique dans le bas du dos et les muscles fessiers, et recycler les postures et les mouvements préjudiciables qui pourraient entraîner une compression de la colonne lombaire.

If you try stretching or getting a massage to release your tight muscles, you’ll likely find that these approaches provide only temporary lengthening of muscles. Your muscles will tighten back up within a few hours due to the stretch reflex. Static stretching and massage do not change the messages that your nervous system is sending to your muscles to stay tight—active movement is necessary to retrain the nervous system.

The most effective way to reduce the tension in your muscles is with a movement technique called pandiculation. The technique of pandiculation was developed by Thomas Hanna, and is based on how our nervous system naturally reduces muscular tension. Pandiculation is the reason why Hanna’s method of Clinical Somatic Education is so effective in releasing tension and relieving pain. Hanna created many self-pandiculation exercises that can be practiced on your own at home.

Pandiculation sends accurate feedback to your nervous system about the level of tension in your muscles, allowing you to change your learned muscular patterns, release chronic muscle tension, and retrain your proprioception. You can read more about pandiculation in this post.

If you’ve learned Clinical Somatics exercises from my online courses or from another Certified Clinical Somatic Educator or Hanna Somatic Educator, you can use this section to help guide you in releasing the muscles that are causing your sciatica or piriformis syndrome. If you’re new to Clinical Somatics, the best place to start is the Level One Course.

Voici les exercices du Cours de Niveau Un qui soulagent le plus directement la sciatique :

Arch & Flatten: I recommend practicing this every day. It’s best to begin your practice with this exercise, because it gently releases the lower back muscles and prepares you for the rest of your practice.

Back Lift: If you have sciatica or piriformis symptoms on both sides, then practice this on both sides. If you have symptoms only on one side, try doing this exercise (and the following exercises) only on that side to release the tight muscles and balance out your tension and posture. To do this, turn your head away from the side on which you experience symptoms. So, when doing the full movement, you’ll be lifting up the leg in which you feel symptoms. Only lift up your leg as high as is comfortable, and if it’s not comfortable, skip it for now. Be sure to lower your leg down as slowly as you possibly can.

Side Curl: This exercise releases the obliques; however, these can play a role in sciatica if your obliques are tighter on one side, causing you to hike one hip up or bend to that side. So if you have symptoms on one side, practice the Side Curl on that side. To do this, lie down on your non-painful side, and practice this exercise curling up to the side on which you have symptoms. Really try to get a sense of the muscles on the side of your waist contracting, then release them as slowly as you possibly can—resist gravity as you lower down. Completely relax for a few moments before repeating the movement.

One-Sided Arch & Curl: This exercise gives you the opportunity to do the Arch & Curl while focusing on just one side at a time. If you have symptoms on both sides, then practice this exercise on both sides. If you have symptoms on one side, lift up your knee on that side, and practice the exercise.

Iliopsoas Release: Tightness in the iliopsoas is very common, and it can compress the lumbar spine. If you have symptoms on both sides, then practice this on both sides. If you have symptoms on one side, practice this exercise by lifting up the leg in which you have symptoms.

Hip Rotation: The External Hip Rotator Release will help you to gently release your gluteal muscles. Practice this on both sides if you have symptoms on both sides. If you have symptoms on one side, practice this on the side in which you have symptoms.

Et quelques exercices supplémentaires du Cours de Niveau Deux:

Lower Back Release: This is a wonderful exercise that gently releases the lower back, gluteals, and hamstrings. The more slowly you do this exercise, the more benefit you’ll get.

Proprioceptive Exercise 1: This exercise helps you to retrain your sitting posture, which is important for sciatica sufferers. Practice this to become aware of your sitting posture and of tightness in your lower back that could be causing your symptoms.

Gluteal Release: This is an important exercise for both sciatica and piriformis syndrome sufferers. Practice it on both sides if you have symptoms on both sides, or if you have symptoms on one side, practice it just with that side.

Standing Hamstring Release and Seated Hamstring Release: When you’re comfortable with the Lower Back Release and the Hamstring Release, you can practice these exercises to release your lower back and hamstrings further. If these exercises are not comfortable for you, then skip them for now.

Finally, be aware of how you’re using your body as you go through your daily life. Your progress with the exercises will be slower if you continue to do activities or habitual postures that are keeping you stuck in your patterns of tension and exacerbating your symptoms. Notice the tension that you hold in your lower back, as well as how you might be using the sides of your body differently when you:

• Restez debout quelques minutes : maintenez-vous une tension dans le bas du dos ? Vous penchez-vous d'un côté ?
• Portez votre sac ou votre enfant : Avez-vous des tensions dans le bas du dos ? Utilisez-vous toujours le même côté ?
• Asseyez-vous à un bureau : Avez-vous des tensions dans le bas du dos ? Vous penchez-vous d'un côté ou croisez-vous une jambe sur l'autre ?
• Détendez-vous sur votre canapé : vous penchez-vous d'un côté ou vous allongez-vous sur le côté ?
• Dormir : Dormez-vous plus d'un côté que de l'autre, ou dormez-vous sur le ventre ? Dormir sur le dos est préférable; placez un oreiller sous vos genoux si cela vous rend plus confortable.

Prêt à commencer à apprendre ?

If you’d like to learn Clinical Somatics exercises at home, the best place to start is the Level One Course. This online course teaches the exercises through video demonstrations, audio classes, and written explanations.