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Lower back pain is a common issue that can be caused by a variety of factors, including muscle strain, herniated discs, or structural abnormalities. Understanding the anatomy of the lower back is crucial for identifying the root causes and implementing effective treatments. The lower back, also known as the lumbar region, plays a vital role in supporting our bodies and enabling various movements. It is composed of several elements, including vertebrae, intervertebral discs, muscles, and ligaments. The deep muscles of the lumbar spine, such as the multifidus and transversospinalis, are responsible for stabilizing the spine and maintaining proper alignment. Weak abdominal muscles can also contribute to lower back pain by causing an increase in the curve of the lower back, resulting in an unhealthy posture. Additionally, stress can lead to muscle tightness and spasms, further exacerbating lower back pain. Other muscles like the gluteal muscles, iliacus, and psoas muscle can also be involved in lower back pain, often radiating pain outwards or causing compression of spinal discs and joints.
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What You'll Learn
Stress and muscle weakness
Stress can cause the back muscles to tighten, leading to spasms and pain. This is part of the body's natural "'fight or flight" response, which also involves increased heart rate, higher blood pressure, faster breathing, and changes in blood flow. The complex bodily and hormonal changes that occur during this response can cause muscles to feel weak, even if they are not actually weaker.
Chronic stress can also lead to muscle weakness and back pain. Stress causes the back muscles to tighten, depriving them of the energy needed to support the spine. This can result in muscle wasting and subsequent weakening, causing more back pain because the muscles are less able to support the spine.
The multifidus muscles, which attach directly to the spinal column, are important in lower back pain. These muscles help to keep the back straight and stable, and issues with these muscles can lead to problems with other muscles as they attempt to avoid pain. The gluteal muscles are also commonly involved in lower back pain, often radiating outwards toward the side of the hips and causing sciatic nerve-like pain.
The iliacus muscle, which attaches on the inside of the pelvis and runs downwards, can also cause lower back pain when injured. This type of injury often causes a deep pain that can feel like it is coming from the kidneys, and it may be difficult to straighten up, feeling like you are leaning to one side.
To address stress-related muscle weakness and back pain, physical therapy and exercise are often recommended. This typically involves strengthening the flexor, extensor, and oblique muscles, which help support the spine and reduce lower back pain. Walking, stretching, and yoga exercises can also help to improve blood flow and keep the muscles active, reducing the stress and anxiety that can contribute to muscle weakness.
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Hamstring tightness
Tight hamstrings are a common cause of lower back pain. The hamstrings are a group of muscles located at the back of the thighs, responsible for flexing the knee and extending the hip. When the hamstrings become tight, they can cause an imbalance in the pelvis, leading to increased stress on the lower back. This can result in muscle imbalances, restricted movement, and ultimately, lower back pain.
Tight hamstrings will pull on the ischial tuberosities, one of the areas of the pubic bone. This movement tilts the pelvis back, causing the vertebrae in the lower back to flex forward. This can strain the ligaments surrounding the vertebrae and worsen any bulging disks in the back.
Tight hamstrings are often caused by a sedentary lifestyle, with prolonged periods of sitting leading to stiffness and tightness in the hamstrings. Weak hip muscles can also cause the hamstrings to compensate, leading to a stabilising role and perceived tightness.
To treat lower back pain caused by tight hamstrings, specific stretches can be performed to lengthen and reduce tension in the hamstring muscle, reducing stress in the lower back. One such stretch involves standing and bending forward at the waist with arms hanging down towards the ground and legs straight, attempting to touch the toes. Another stretch involves sitting on a chair with one leg straight out on another chair in front, reaching towards the toes and stretching one leg at a time.
Strengthening the hip and core muscles can also help stabilise the pelvis and alleviate the compensatory role of the hamstrings.
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Iliacus issues
Lower back pain can be caused by several factors, including muscle strain, herniated discs, or spinal stenosis. One muscle that is often implicated in lower back pain is the iliacus muscle. The iliacus is a large muscle that attaches to the inside of the pelvis and runs downwards. It is one of the two muscles that make up the iliopsoas muscle group, the other being the psoas muscle.
One common problem with the iliacus muscle is that it can shorten over time due to prolonged sitting, driving, or a lack of regular stretching. Athletes who don't stretch enough may also experience iliacus shortening, as a strong muscle that is not stretched can become dense and inflexible. Once the iliacus shortens, it may have trouble returning to its normal resting length.
Additionally, the iliacus can become ischemic (have low blood flow), which can lead to pain in various parts of the body. Dysfunction of the iliopsoas muscle group, of which the iliacus is a part, is a frequently overlooked cause of lower back, hip, groin, and leg pain. Conditions like iliopsoas syndrome and pelvic torsion are associated with iliopsoas dysfunction and can lead to chronic or recurrent pain, tingling, numbness, and other symptoms.
To address iliacus issues, it is important to seek proper assessment and treatment, as standard tests may not detect issues with this muscle. Treatment may include rest, physical therapy, and stretching, but static stretching methods should be avoided as they can trigger the Protective Stretch Reflex, causing the muscle to resist the stretch.
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Gluteal muscles and sciatica
Lower back pain can be caused by a variety of factors, including muscle strain, herniated discs, or structural abnormalities. The muscles of the lower back work together with the transverse abdominal muscles to stabilise the spine and maintain proper alignment, as well as to enable movement.
The gluteal muscles are a group of large muscles in the buttocks region that can be a common cause of lower back pain, particularly around the belt line, radiating outwards towards the hips. This is often associated with sciatica, a condition causing pain along the sciatic nerve, which runs from the lower spine, through the buttocks, and down the back of each leg.
Deep gluteal syndrome (DGS), also known as piriformis syndrome, is a less commonly recognised cause of sciatica. It occurs when the piriformis muscle, located under the gluteus maximus, compresses the sciatic nerve, leading to inflammation and pain. Piriformis syndrome can be caused by various factors, including injury, swelling, muscle spasms, scar tissue, or anatomical variations. Diagnosis can be challenging, and treatment options may include rest, simple treatments, and in some cases, surgery.
To alleviate lower back pain and sciatica related to the gluteal muscles, exercises that strengthen and lengthen the glutes are recommended. This includes breaking the cycle of clenching the glutes, which can contribute to further pain and tightness. A multi-pronged approach, such as addressing habits, unloading deep hip rotators, and strengthening the hip complex, can help provide long-term relief.
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Multifidus and transversospinalis muscles
The multifidus muscle is a deep muscle in the back that plays a significant role in lumbar stability and is crucial for motor control exercises targeting lumbar stability. It is defined as a deep muscle in the back that arises from the mamillary process, attaches to facet joint capsules, and stabilizes the spine by preventing capsular impingement. The multifidus muscles are the deepest layer of muscles and attach directly to the spinal column. They fill up the groove on either side of the spinous processes of the vertebrae, from the sacrum to the axis.
The transversospinalis muscle group is a deep group of back muscles that lie deep to the Erector Spinae. It consists of three major subgroups: semispinalis, multifidus, and rotatores. The transversospinalis muscles run obliquely upward and medially from the transverse processes to adjacent, and sometimes more distant, spinous processes. They are thought to function as postural stabilizers, acting as dynamic ligaments that adjust small movements of the vertebral column, ensuring the efficient action of the long superficial muscles. The transversospinalis muscles share the same nerve supply from the dorsal rami of the spinal nerves.
The deep muscles, like the multifidus and transversospinalis muscles, are in charge of stabilizing the spine and maintaining proper alignment. They are also important in keeping the balance of the moving body. Dysfunction in the lumbar multifidus muscles is strongly associated with low back pain. The dysfunction can be caused by inhibition of pain by the spine and can persist even after the pain has disappeared.
The lumbar spine consists of five vertebrae, labelled L1 to L5. These vertebrae are bigger and stronger than those in other spine areas, separated by intervertebral discs that act as shock absorbers and promote flexibility. The extensor muscles are attached to the back of the spine and enable actions like standing and lifting objects. The flexor muscles are attached to the front of the spine and enable bending forward, lifting, and arching the lower back. Oblique muscles are attached to the sides of the spine and help rotate the spine and maintain proper posture.
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Frequently asked questions
The gluteal muscles, erector spinae, multifidus, iliopsoas, iliacus, and psoas muscles are all associated with lower back pain.
Stress causes back muscles to tighten in a fight or flight response, depriving muscles of energy needed to support the spine. This can lead to spasms and pain.
Lower back pain can be accompanied by muscle spasms, stiffness, soreness, limited range of motion, swelling, weakness, and pain.
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