How To Sit With Si Joint Pain | Doctor’s Sacroiliac Joint Pain Guide

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Best Sitting Position for Sacroiliac Joint Pain

You’ve never read anything like this before. This is for those frustrated with sacroiliac (SI) joint pain and looking for guidance on how to sit correctly. SI joint pain sufferers can choose from various ergonomic chairs and cushions. In one context, seating that may be beneficial for someone with SI joint pain may not always be appropriate in another.* Simply put, your seat cushion or chair needs to be comfortable!

As a general rule, it is best for someone with SI joint pain (sacroiliac) to sit in a chair with adjustable seat height, a forward tilt, and adjustable seat depth. The foam or mesh fitting density must allow for a certain amount of conformity.  

If you’re wondering what the best way to sit is for those suffering from SI Joint Pain, I believe I can help. For over 30 years and during that time, I practiced chiropractic as well trained ergonomist with a published book on posture; I also ran a successful Kickstarter campaign which funded the development of my latest project -a set of ergonomic seat cushions. In this regard, I’m confident that I can offer some helpful insights!

woman with SI joint pain

Not only is your back hurting, but now you also have pain in your buttocks, correct?  Sacroiliac joint pain is common and can be caused by injury to this part of the spine that connects with the hip. This type of discomfort may mimic other things, such as herniated discs or hip problems, so it’s vital for an accurate diagnosis before determining treatment methods.*

Unlike many other joints like your knee or elbow, your SI joint moves very little and is held together with thick ligaments. Sudden injuries or repetitive stress can cause the SI joint to become inflamed and painful. You may feel this pain in your buttocks or lower back.  This is when sitting becomes painful.*

Sitting for extended periods can cause pain in your SI joint or aggravate existing pain. However, some positions pose less risk of causing pain than others.* Let me explain what positions you should avoid and what position is best for relieving SI joint pain.

Best Chair for SI Joint Pain

best chair SI joint pain

People with poor backs and individually unique needs can find an ergonomic chair to fit their needs by choosing from a wide variety. There is no universal ergonomic chair, so chairs should be designed with human factors. In one context, what may be advantageous for a bad back may be unacceptable in another.* In other words, you need to have a comfortable chair!

I wrote a ‘hands-on’ article explaining the unknown pros and cons of kneeling chairs HERE.

4 Factors Your Office Chair Must Have for SI Joint Relief

Adjustable Seat Height

correct seat height for students

It’s essential to find a seat height that feels comfortable. Keeping your feet flat on the ground is always a good idea when placing your chair at the highest possible level. Adjusting your seat control will allow you to make this change. As the gas cylinder in the chair is adjustable, the seat rises and falls with it. When you sit in them, they compress the air, then release it when you stand up. Chairs usually have a lever for controlling them.  

Choosing the right ergonomic chair requires considering the chair’s gas cylinder, an integral component. The suitable gas cylinder installation can be customized for your body shape and height.  

Forward Seat Tilt 

seat tilt

You can reduce your SI joint pain using an ergonomic office chair with a forward tilt. Some standards recommend up to 20 degrees of tilt forward. You can reduce back pain by tilting the chair in a forward direction. 

When sitting, keeping your posture upright will also be encouraged by a forward tilt. In addition, it improves blood circulation in the legs and feet. The chair also helps you maintain good posture when you are sitting.

Having your pelvis upright with an upright seat tilt will help relieve the stress on your sacroiliac joints. This will let your core muscles handle your weight more effectively. All day long, this posture encourages an active posture.

It might be best to sit on a seat wedge instead of a chair that lacks this feature. Make sure it has more thickness toward the back, however.

 Seat Pan Depth 

seat depth

Based on my clinical experience, I have found that adjusting the seat pan depth on an ergonomic chair is one of the most beneficial adjustments for helping you with a bad back. The surface area plays a crucial role in providing comfort.

Short seat depths may aggravate SI joint pain. Insufficient blood flow in your legs and feet may result from an excessively long seat.

Seating depth: how to get it right:

  • Ensure that your backrest is firmly placed against your back.  
  • Three to five centimeters should separate the edge of your seat from your knees.

 Lumbar Support

lumbar support SI joint pain

Based on the width of the seat, lumbar support should be placed around the L3/L4 vertebrae of the backrest. 

If placed too high, an incorrectly fitted lumbar support can exacerbate the spine curve (lordosis). In the case of low lumbar support, the spine may be overloaded, resulting in back pain. 

I was surprised how similar cheap memory foam seat cushions were on Aliexpress from the listing on Amazon!

It does not matter what resistance the lumbar support provides since the difference in people’s preferences for lumbar support in a seated position is likely to be minimal. Lumbar supports are available in various designs.

You can use a rolled-up towel or a small cushion if you don’t have lumbar support. Put your creativity to good use in this situation.

How to Sit With SI Joint Pain

woman jogging low back pain

Every day in my private practice, people ask me how to sit when they have SI joint pain. My patients hear this from me:

  1. Make sure you sit in the correct position (as described above). Set your seat height, depth, forward light, and lumbar support for maximum comfort.
  2. Whenever possible, stand up. Try to get up every 15 minutes.  
  3. Schedule stretches into your day.  Keep moving here is the most important thing.  A good posture is one that moves! I tell my patients the same thing all the time.
  4. If you’re having trouble sitting, place something at the curve of your back (such as a towel rolled up).
  5. The feet should remain flat on the floor with hips above knees. Your feet should be just slightly in front or directly under your knees.
  6. Last but not least, keep your legs at least shoulder-width apart. You can compare this to a sumo wrestler. 

Why is SI Joint Pain Getting Worse When You Sit?

The most common cause of SI joint problems is sitting with bad posture.* Sitting with the shoulders hunched down or slouched can strain the SI joints. Additionally, your spinal discs are filled with fluid, preventing the vertebrae from rubbing together. The condition may exacerbate the effects of osteoarthritis (DJD) on back pain.

Choosing an Office Chair Cushion for SI Joint Pain

If you are into super easy and inexpensive alternatives to office chairs, I wrote a fantastic article on how and why you should consider these options for back pain, and I encourage you to read it!

I will begin by discussing cushion types I do not recommend. The types of foam include memory foam, polyurethane foam, and Gel foam. There are several reasons for this:

 Memory Foam Office Chair Cushions for SI Joint Pain

wrong memory foam

Memory foam may not be the best choice for a seating cushion for several reasons:

  • Response time is too slow.  It’s less painful to experience back pain when you use a responsive cushion. Response time and degree of responsiveness are among the characteristics of foam. Memory foam is ineffective for SI joint pain due to its inherent inflexibility.
  • Heat-retaining. Those who sit on memory foam may find it uncomfortable as it retains heat.
  • Chemicals!  Polyurethane is a chemical produced from the refining of crude oil. Memory foams have PVC, antimony trioxide, polyurethane, and formaldehyde.
  • Fire retardants are overused.

 Gel Foam Office Chair Cushions for SI Joint Pain

memory foam seat cushion with gel cooling cushion

Gel CushionsGel cushions are composed of polymer and can be flat or contoured. As they do not flow or move like liquid gels, they will not be damaged if their plastic container ruptures.

Gel slabs sold on the market do not flow like liquid gels and do not absorb shocks or reduce pressure.

Testing hundreds of gel cushions on our patients didn’t provide much comfort or pressure point relief. We found this prototype to be our least comfortable (-90%). Gel cushions in the honeycomb shape never seemed pleasant for any of our clients! 

The Best SI Joint Pain Cushions Are Made of Natural Latex Foam

man sitting on a seat cushion

I explain the concept of ergonomic seat cushions on a national TV show HERE!

After comparing different seating materials, it was determined that natural latex was the best choice. Here are the reasons:

  • Natural Latex is Better for Spinal Alignment.  Your lower body remains aligned if you sink your heavier parts into the latex and keep your lighter parts aligned naturally. Due to the even distribution of pressure on your muscles and ligaments, latex cushions improve blood circulation while dealing with muscle and ligament pain.  
  • Relieve pressure. In addition, natural latex has the ability to align your spine and ease pressure points.
  • Resilient.  Natural latex seat cushions resist sinking and rebound with your weight after a certain point. That’s what makes natural latex so unique. 
  • Customizable.  I have created so many custom products because of the versatility of natural latex, which is why I am so interested in the chiropractic and ergonomics fields. 
  • We use it because it’s non-toxic/eco-friendly.  Contrary to memory foam, natural latex seats consist of natural materials and are chemical-free. 
  • Good air circulation.  The comfort provided by latex foam is superior to many traditional memory foams (derived from petroleum).
  • It is anti-microbial.  The natural resistance of latex means it prevents bacteria, mold, and dust mites from growing. The device also promotes a healthy working environment thanks to its antibacterial and antifungal properties. 

How Do Sitting Wedges Work for SI Joint Pain? latex seat posture cushion

The SI joint pain will be reduced if you sit on a wedge cushion.* If you sit with a wedge, your torso will be aligned with your upper legs. With a cushion, your spinal curve will also be improved, with a forward tilt to your pelvis. It will reduce stress, stabilize your spine by distributing your weight more naturally through your muscles, and make it easier for you to sit upright and avoid strain on your joints, discs, and ligaments.

Your body position will determine your seat angle between 8 and 13 degrees. When you are currently experiencing back pain or have never sat in this way, you may want to sit for short periods at first and gradually increase the time you sit while honing your back muscles. 

The sitting wedge removed pressure from the coccyx area by removing problematic loads. You can sit comfortably with no discomfort if you do this.

Why Should You Use a Sitting Wedge for SI Joint Pain?

good vs bad seating posture wedge

When you hunch over your desks, it can put pressure on your SI joints and cause you to feel pain. Luckily, sitting wedges help prevent this kind of posture with added support!

 Benefits of Sitting Wedge Cushions:

  • SI joint support and comfort
  • Better posture
  • Muscles of the core are engaged when using a wedge cushion.
  • Relieves back pain or sciatica
  • Coccyx pain relief 

How Should You Use a Core Muscle Wedge for SI Joint Pain?

The chair wedge will help you sit up straighter and feel more comfortable. Simply place it on the front of a chair, then put your feet firmly onto its slope so that they’re pointing away from the back of the seat – this is called “sitting in reverse.” This way, gravity does most of the work for you!

My Recommendations:

Your wedge cushion must have the following:

  • Must have a slope of 8-13 degrees
  • A high-quality foundation foam support base (+96 kg/m3)
  • Top comfort layer (56-68kg/m3)
  • Natural Latex provides the best level of comfort, resilience, and alignment
  • 4D stretch cover
  • Non-skid bottom cover

Can Yoga or Pilates Help SI Joint Pain?

It depends.  When Covid went down, many people turned to online yoga and Pilates instruction by watching videos on Youtube. The best approach to treating SI joint pain seems to be exercise, right? Have you noticed that most exercises aggravate your pain? Another way to think about it would be if your front end were out of alignment, would you drive it more challenging and faster? That’s not the case. As a result, the damage will likely develop, and more significant problems may arise.

Pilates SI joint stretch

When you have SI joint pain, you should do whatever it takes to eliminate the cause. When back patients present with SI joint pain, I have seen too many Youtube physicians, trainers, or therapists simply instruct them to do some exercises in the office.  

Consider your structure before you seek treatment for your back pain. Perhaps you are experiencing back pain due to lifestyle changes, posture issues, etc. It’s more precise to say that these pains result from abnormal movement patterns and motor control. Today, many people have intolerant backs from flexion (bending forward). Using a seat cushion can prevent that from happening.

I’ve written a complete hands-on review about the Best Seat Cushion for Pregnancy, and here are some of the shocking issues I ran into in this post!

When you sit hunched forward or bend over, you may exacerbate your pain and hinder the healing of your tissues. Therefore, it is also essential to figure out your specific pain triggers and avoid them to fully recover your muscles, joints, and discs.

An ideal pelvic region can only be achieved when the entire musculature, including the anterior chain (front) and posterior chain (back) muscles, is strengthened in a balanced manner. Concentrating on a single muscle is usually not beneficial since it creates patterns that result in less stability. It is essential to consider this point when discussing the best back pain office chair cushion later. 

anatomy of sacroiliac joints

Many forms of therapy aim to stretch muscles and increase the range of motion in the SI joints. This is a downside: people with too much flexibility in their back are more likely to encounter future back problems. Here’s why:

The sacrum is shaped like an arrowhead. Powerful ligaments hold the sacrum rigidly to your ileum at the bottom of your spinal column. As thick rubber bands, these ligaments keep everything in place. 

Yoga and Pilates SI joint stretches may stretch and loosen these ligaments, but if you sit at your desk for many hours, your sacrum (arrowhead) may move downward, causing mechanical back pain.

Back pain patients, for example, tend to overuse and use their backs incorrectly more often.  People who sit, stand, or move incorrectly increase their backloads, resulting in pain. They may have more motion and strength in their backs and SI joints but less motion and load in their hips (ball and socket joints). It is essential to keep in mind this point when thinking about the most suitable exercises for your pain triggers.


We know that sitting is one of the most common positions people experience pain in, especially those who suffer from SI joint problems. Choosing a chair or cushion can be difficult if you are unsure what to look for, and this blog post has given some great advice on best sitting with sacroiliac joint pain. If you want more information about ergonomic chairs.





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  4. O’shea, F.D., Boyle, E., Salonen, D.C., Ammendolia, C., Peterson, C., Hsu, W. and Inman, R.D., 2010. Inflammatory and degenerative sacroiliac joint disease in a primary back pain cohort. Arthritis care & research62(4), pp.447-454.
  5. Cohen, S.P., 2005. Sacroiliac joint pain: a comprehensive review of anatomy, diagnosis, and treatment. Anesthesia & Analgesia101(5), pp.1440-1453.
  6. Szadek, K.M., van der Wurff, P., van Tulder, M.W., Zuurmond, W.W. and Perez, R.S., 2009. Diagnostic validity of criteria for sacroiliac joint pain: a systematic review. The Journal of pain10(4), pp.354-368.
  7. Snijders, C.J., Vleeming, A. and Stoeckart, R., 1993. Transfer of lumbosacral load to iliac bones and legs: Part 1: Biomechanics of self-bracing of the sacroiliac joints and its significance for treatment and exercise. Clinical biomechanics8(6), pp.285-294.
**As a service to our readers, Axial Chairs provides access to our library of archived content. Please note the date of the last review or update on all articles. No content on this site, regardless of date, should ever be used as a substitute for direct medical advice from your doctor or other qualified clinicians.
Dr Lawrence Woods DC

Dr Lawrence Woods DC


My goal is to create the highest quality ergonomic office chairs and accessories for unmatched comfort.

With 30 years of spinal healthcare experience in Ireland as a chiropractor, I learned the value of high-quality sitting for living a happy and healthy life.

I have a Chiropractic Degree from Life Chiropractic College West and I am NBCE Physiotherapy certified.


Dr Lawrence Woods

My goal is to create the highest quality ergonomic office chairs and accessories for unmatched comfort. With 30 years of spinal healthcare experience as a chiropractor, I learned the value of high-quality sleep for living a happy and healthy life. I have a Chiropractic Degree from Life Chiropractic College West and am NBCE Physiotherapy certified.

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