Strong ligaments and muscles support the SI joints. There is a very small amount of motion in the joint for normal body flexibility. As we age our bones become arthritic and ligaments stiffen. When the cartilage wears down, the bones may rub together causing pain (Fig. 1). The SI joint is a synovial joint filled with fluid. This type of joint has free nerve endings that can cause chronic pain if the joint degenerates or does not move properly.


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Don’t medically investigate back pain until it’s met at least three criteria: (1) it’s been bothering you for more than about 6 weeks; (2) it’s severe and/or not improving, or actually getting worse; and (3) there’s at least one other “red flag” (age over 55 or under 20, painful to light tapping, fever/malaise, weight loss, slow urination, incontinence, groin numbness, a dragging toe, or symptoms in both legs like numbness and/or tingling and/or weakness).
Muscle Imbalances – The front of your hips, your hip flexors, are the muscles that will tighten and shorten while you are sitting for hours each day. While you are sitting, the back of your hips, your glutes and your hip extensors, are being overstretched. But just because they are being tightened and stretched respectively, doesn’t benefit either of them. They are also being weakened because of the lack of use of each muscle group.
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“As a result, they’re at greater risk of injury,” says physical therapist Ioonna Félix, clinical supervisor at the Hospital for Special Surgery’s Sports Rehabilitation and Performance Center in New York City. Many times, those injuries manifest themselves in ways that seem entirely separate from your hips, like IT band issues, low-back pain, or plantar fasciitis.
Grade III (severe): A complete tear in your muscle that causes severe pain and swelling and you can't bear weight on that leg, making it difficult to walk. You've also lost more than 50 percent of your muscle function. These injuries are less common and may need surgery to repair the torn muscle. They can take several months or more to completely heal.
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