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Paraspinal muscles are crucial for spinal movement and support. They are located on either side of the spinal column and are made up of three muscle groups: the iliocostalis, the spinalis, and the multifidus. The paraspinal muscles are responsible for movements like leaning to the side, arching the back, bending forward, and twisting the torso. They also help maintain proper posture and protect the spinal segments. These muscles can be injured directly, such as through a pulled back muscle, or indirectly, such as through muscle spasms after an injury to other parts of the spine. Paraspinal muscle atrophy and degeneration are common in patients with acute and chronic low back pain, and the cross-sectional area of these muscles can be used to assess cases of lumbar back pain.
| Characteristics | Values |
|---|---|
| Definition | Paraspinal muscles are three muscle groups that support the spine and power and stabilize movement of the spine. |
| Location | Located on either side of the spinal column. |
| Function | Help maintain proper posture, protect the spinal segments, and support the spine. |
| Importance | Crucial for spinal health and play a vital role in the functioning of the spine and the whole body. |
| Spinal Disorders | Spinal disorders can cause muscle dysfunction and insufficiency in the paraspinal muscles. |
| Back Pain | Low back pain disorders affect more than 80% of adults in their lifetime. |
| Asymmetry | Paraspinal muscle asymmetry in cross-sectional area (CSA) and composition are associated with low back pain and pathology. |
| Fatty Infiltration | Fatty infiltration in the paraspinal muscles can lead to a reduction in spinal function and cause back pain. |
| Atrophy | Atrophy refers to the loss of muscle mass and can make it harder for the paraspinal muscles to stabilize the spine. |
| Hypertrophy | Hypertrophy can be identified using radiographic parameters such as CSA and FI. |
| Exercises | Regular stretching and strengthening exercises can help keep the paraspinal muscles efficient and avoid back pain. |
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What You'll Learn
Paraspinal muscle atrophy
The integrity of the paraspinal muscles is crucial for maintaining proper spinal alignment and preventing spinal deformities. When these muscles atrophy, it can lead to an increased risk of developing spinal deformities, such as altered lumbar lordosis, thoracic kyphosis, and changes in the sacral-vertebral angle. The atrophy of these muscles is commonly associated with low back pain (LBP) and is estimated to occur in 20%-60% of individuals suffering from chronic lower back pain. Atrophy of specific paraspinal muscles, such as the multifidus and erector spinae, has been linked to spinal stenosis, isthmic spondylolisthesis, facet arthropathy, and degenerative lumbar kyphosis.
The cross-sectional surface area (CSA) of the paraspinal muscles is often used as a clinical indicator to evaluate their degeneration and atrophy. A decrease in CSA indicates muscle atrophy. Magnetic resonance imaging (MRI) is a valuable tool for assessing paraspinal muscle atrophy and quantifying fatty infiltration. MRI scans can help identify muscle atrophy, hypertrophy, and degeneration, aiding in the diagnosis and management of spinal disorders.
Minimally invasive surgery (MIS) techniques for lumbar spine fusion have gained popularity due to their ability to minimise muscle injury compared to conventional open surgery (COS). MIS avoids long incisions and reduces the risk of muscle atrophy, which can result in back pain and failed back surgery syndrome. However, there is a need for further research to establish the relationship between preoperative paraspinal muscle integrity and postoperative success, which could guide surgical decision-making.
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Paraspinal muscle hypertrophy and spinal disorders
Paraspinal muscles are located on either side of the spinal column and are responsible for moving, supporting, and stabilising the spine. They are also known as core muscles and back muscles.
Paraspinal muscle hypertrophy is associated with spinal disorders, which affect millions of people worldwide and can cause significant disability, reduced mobility, and pain. Spinal disorders encompass a range of musculoskeletal issues affecting the spinal column and its associated structures. The prevalence of musculoskeletal disorders has been increasing since 1990, making them a leading cause of global disability-adjusted life years.
Hypertrophy of the paraspinal muscles can occur alongside atrophy and degeneration as a result of spinal disorders. In patients with degenerative lumbar spine (DLS), there was observed atrophy in the multifidus muscle (MF) and hypertrophy in the erector spinae (ES). The MF atrophy may contribute to lumbar instability, while the ES hypertrophy may act as a compensatory mechanism to address this instability.
The cross-sectional surface area (CSA) of the paraspinal muscles can be used as an indicator of atrophy or hypertrophy. A decrease in CSA indicates atrophy, while an increase suggests hypertrophy. MRI, CT, and US imaging techniques can be used to measure CSA and identify muscle abnormalities.
Paraspinal muscular atrophy is often associated with spinal surgery, during which the paraspinal muscles may be retracted and tendons attaching them to the bone may be cut. It can also be caused by back injuries, lack of blood supply, nerve injuries, or immobilisation following surgery.
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Paraspinal muscle asymmetry
Paraspinal muscles are an extensive set of muscles that run along the back of the spine. They are crucial in athletic movements and help maintain proper posture and protect the spinal segments.
A recent magnetic resonance (MR) imaging study showed that 40% of 126 men who were asymptomatic had multifidus muscle asymmetry exceeding 10%. Evidence from a systematic review suggested that the multifidus muscle and the paraspinal muscle group are significantly smaller in people with chronic LBP than in healthy people and that they are significantly smaller on the symptomatic side of patients with chronic, but not acute, unilateral LBP than on the asymptomatic side.
Core stability training and back exercises are effective in strengthening the paraspinal muscles.
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Paraspinal muscle injury and lumbar spine surgery
Paraspinal muscles are crucial for spinal movement, support, and stabilisation. They are also important for athletic movements and maintaining proper posture. Paraspinal muscle injuries can occur directly, such as a pulled back muscle or muscle strain, or indirectly, such as muscle spasms after an injury to other parts of the spine.
Paraspinal muscles are commonly affected during lumbar spine surgery, and atrophy of these muscles after surgery is a frequent occurrence. Conventional open surgery (COS) is associated with extensive iatrogenic paraspinal muscle injury due to direct muscle dissection, denervation, and ischemia during long hours of muscle retraction. COS is also associated with more prominent fatty degeneration of the paraspinal muscles, which can lead to back pain and failed back surgery syndrome.
Minimally invasive surgery (MIS) techniques for lumbar spine fusion have become a popular alternative to COS as they avoid long incisions and reduce muscle injury. MIS can cause less muscle injury than COS, and it has been shown to provide good results in the decompression of spinal stenosis. However, few studies have directly compared the outcomes of COS and MIS on paraspinal muscle changes.
Rehabilitation after lumbar spine surgery is important to address paraspinal muscle atrophy and improve surgical outcomes. Core stability training and back exercises are effective in strengthening paraspinal muscles. MRI and CT scans are useful tools for evaluating paraspinal muscle degeneration and fatty infiltration before and after surgery.
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Paraspinal muscle exercises
Paraspinal muscles, also known as vertebral column muscles, are a group of muscles that run alongside the spine and provide stability, support, and movement to the vertebral column. Strengthening these muscles can help improve spinal stability, posture, and overall back health, and is especially beneficial for those with paraspinal muscle hypertrophy, a condition characterized by an enlargement or overdevelopment of these muscles.
Bird Dog
- Start on all fours with your hands directly under your shoulders and your knees directly under your hips.
- Maintain a neutral spine and engage your core.
- Lift your right arm and extend it forward at shoulder height while lifting your left leg and extending it backwards, also at hip height.
- Hold for a moment, then return to the starting position.
- Repeat with the opposite arm and leg.
- Aim for 10-15 repetitions on each side.
Plank
- Start in a push-up position but bend your elbows and rest your weight on your forearms instead.
- Your body should form a straight line from head to toe.
- Engage your core and quads, and be sure to keep your buttocks clenched and your spine neutral.
- Hold this position for 30 seconds to a minute.
Side Plank
- Lie on your side with your legs extended and stack your feet on top of each other.
- Prop your upper body up by resting your weight on your forearm, which should be perpendicular to your body with your elbow directly under your shoulder.
- Lift your hips off the ground, forming a straight line from head to toe.
- Hold this position for 30 seconds, then switch sides.
Back Extension
- Lie flat on your stomach with your arms by your side.
- Slowly lift your head, shoulders, and chest off the ground, keeping your hands by your side or clasping them behind your back.
- Hold for a moment at the top, then slowly lower back down.
- Repeat for 10-15 repetitions.
Superman
- Lie flat on your stomach with your arms extended overhead and your legs extended straight behind you.
- Simultaneously lift your arms, chest, and legs off the ground, squeezing your back muscles and glutes.
- Hold for a moment, then slowly lower back down.
- Repeat for 10-15 repetitions.
These exercises target the paraspinal muscles and can help improve spinal stability and posture. It is important to maintain a neutral spine during these exercises and to not overextend or twist your spine. If you are experiencing any back pain or have a history of back injuries, consult with a healthcare professional or physical therapist before attempting these exercises.
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Frequently asked questions
Paraspinal muscles are three muscle groups that support your back and spine. They are crucial to the movement of your spine and are located on either side of the spinal column.
Paraspinal muscle hypertrophy is caused by the enlargement of muscle fibres, which can be due to various factors such as muscle dysfunction, fatty infiltration, fibrosis, and muscle cell atrophy.
Paraspinal muscle hypertrophy can be treated with core stability training and back exercises to strengthen and stretch the muscles. Minimally invasive surgery (MIS) is also an option, as it causes less muscle injury than conventional open surgery (COS).
Symptoms of paraspinal muscle hypertrophy include low back pain, spinal degeneration, and muscle dysfunction. It can also lead to a reduction in spinal function and affect posture.
