INTRODUCTION-
Lumbar spinal stenosis is a narrowing of the spinal canal in the lower back that compresses nerves and blood vessels. It can cause pain, numbness, or difficulty walking. Stenosis can cause pressure on your spinal cord or the nerves that go from your spinal cord to your muscles. Some people with spinal stenosis have no symptoms. Others may experience pain, tingling, numbness and muscle weakness. Symptoms can get worse over time.
The most common cause of spinal stenosis is wear-and-tear damage in the spine related to arthritis. People who have serious spinal stenosis may need surgery. Surgery can create more space inside the spine. This can ease the symptoms caused by pressure on the spinal cord or nerves. But surgery can't cure arthritis, so arthritis pain in the spine may continue.
Symptoms
Spinal stenosis often causes no symptoms. When symptoms do happen, they start slowly and get worse over time. Symptoms depend on which part of the spine is affected.
In the lower back
Spinal stenosis in the lower back can cause pain or cramping in one or both legs. This happens when you stand for a long time or when you walk. Symptoms get better when you bend forward or sit. Some people also have back pain.
In the neck
Spinal stenosis in the neck can cause:
• Numbness.
• Tingling or weakness in a hand, leg, foot or arm.
• Problems with walking and balance.
• Neck pain.
• Problems with the bowel or bladder.
Etiology
Some people are born with a small spinal canal. This is called "congenital stenosis”. However, spinal canal narrowing is most often due to age-related changes that take place over time. This condition is called "acquired spinal stenosis." Spinal stenosis is most common in people over 50 years of age.
Acquired forms of LSS are further classified as degenerative, spondylolisthetic, iatrogenic (postsurgical), posttraumatic, or combined.
Lumbar spinal stenosis can be caused by:
Degenerative spondylosis - With aging, wear-and-tear changes, and traumas, amongst other factors, the intervertebral discs can degenerate and protrude posteriorly, causing increased loading of the posterior elements of the vertebrae. This can lead to posterior vertebral osteophyte formation (uncinate spurs), facet hypertrophy, synovial facet cysts, and ligamentum flavum hypertrophy, which in turn will cause spinal stenosis.
Differential Diagnosis
During the differential diagnosis, red-flag symptoms must be assessed. If such symptoms are present, further diagnostic workup is immediately warranted.
The differential diagnosis of spinal stenosis is broad and differentiation between several conditions may be complicated because of their frequent coexistence, certainly in the elderly.
Pathologies/diseases that mimic lumbar spinal stenosis are:
• Disc herniation
• Spinal cord primary or secondary tumour
• Peripheral neuropathy
• Osteoarthritis of hips or knees
• Osteoporotic/lumbar compression fracture
• Myofascial pain
• Rheumatoid arthritis
• Lumbar degenerative disk disease
• Lumbar facet arthropathy
• Lumbar spondylosis, spondylolysis, spondylolisthesis and spondylodiscitis
• Mechanical low back pain
• Cauda equina syndrome = red flag
• Peripheral vascular disease (vascular claudication)
• Nonspecific low back pain
• Infection
• Radiculopathy
• Spinal cord vascular malformations
Diagnostic Procedures
Diagnosis is made by a doctor based on patient history and physical examination. In addition, medical imaging can be performed to confirm the diagnosis. First the clinical diagnosis of LSS the history and medical history of the patient should be questioned. Ask for a description of symptoms and for any injury, condition, or general health problem that might be causing the symptoms.
The therapist checks for pain or symptoms when the patient hyper-extends the spine (bends backwards), and checks for normal neurologic function (for instance, sensation, muscle strength, and reflexes) in the arms and legs.
• Radiography is usually the first step to identify a degenerative process (disc degeneration, osteophytes, facet hypertrophy)
• MRI (Magnetic Resonance Imaging) (T2 weighted) is used for determining the degree of stenosis and the thickness of Ligamentum Flavum.
• CT scan
• Ultrasound
• Bone scan
Prevention
To prevent lumbar stenosis, focus on maintaining a healthy weight, regular exercise that strengthens core and back muscles, practicing good posture, avoiding smoking, and lifting objects properly by bending your knees instead of your back; consult a doctor before starting any new exercise program.
Key points to prevent lumbar stenosis:
• Exercise regularly:
Engage in low-impact exercises like walking, swimming, or yoga to strengthen your back and core muscles, improving spinal stability.
• Maintain a healthy weight:
Excess weight puts additional pressure on your spine, increasing the risk of stenosis.
Proper posture:
Be mindful of your posture throughout the day, especially when sitting and standing.
Safe lifting techniques:
When lifting heavy objects, bend your knees and engage your leg muscles to avoid putting strain on your lower back.
• Quit smoking:
Smoking can damage blood vessels and contribute to spinal degeneration, increasing the risk of stenosis.
• Stretching and flexibility exercises:
Incorporate stretches that promote spinal mobility to help prevent stiffness.
Important considerations:
• Consult a healthcare professional:
If you have concerns about your risk of lumbar stenosis, talk to your doctor to develop a personalized prevention plan.
• Listen to your body:
Pay attention to any back pain and avoid activities that aggravate your symptoms.
• Gradual progression:
If you are new to exercise, start slowly and gradually increase the intensity and duration of your workouts.
Examination
The physical examination for patients with LSS is usually normal or demonstrates nonspecific findings. Patients with stenosis often have lumbar, paraspinal, or gluteal tenderness, which is usually related to underlying degenerative changes, muscle spasms, and poor posture.
The neurologic examination is usually normal or reveals only subtle abnormalities such as mild weakness, sensory changes, and reflex abnormalities. The achilles tendon reflexes are often diminished, while abnormal knee reflexes are less common. The straight leg-raise test and other neural tension signs are usually negative unless there is accompanying disc herniation. Hamstring tightness is often present and may produce a false-positive straight leg-raise test.
Possible symptoms that occur during the examination are neurogenic claudication, which includes pain in the buttocks, thigh or leg during ambulation that improves during rest, or radicular leg symptoms with associated neurological deficits. These symptoms have to present themselves for at least 12 weeks. An older person with suspicion of spinal stenosis usually stoops forward while walking.
Special test for lumbar stenosis
Straight Leg Raising Test (SLRT): This test indicates Nerve root compression. With the patient lying on a Couch, his affected leg is lifted gradually with the knee Straight. As this is done, the patient complains of pain Or ‘stretching’ at the back of the thigh or in the calf (not back of the knee). The angle at which this occurs Is noted. A positive SLRT at 40° Or less is suggestive Of root compression. The leg is now lowered a little till The ‘stretching’ becomes less. At this angle if the ankle Is passively dorsiflexed, the pain at the back of thigh or In the calf will again be felt. This is called reinforcement Positive (Bragard’s sign)Sometimes, a SLRT performed On the unaffected side, may give rise to pain on the Affected side. This is termed a contralateral positive SLRT And is a very specific sign of root compression, possibly By a disc prolapse.
Medical Management
Conservative treatment is the first-line treatment for this condition.
Conservative treatment options include physical therapy, oral anti-inflammatory medications, and epidural steroid injections. Although there is no standardized physical therapy regimen, many therapists focus on stretching and strengthening of the core muscles, which can lead to correction of posture and improved symptom.
• Steroid Injections
Nerve roots may become irritated and swollen at the area where they are pinched. Injecting a corticosteroid into the space around the compression can help reduce the inflammation and relieve some of the pressure. It is suggested that epidural steroid injections help to control severe radicular symptoms in patients with spinal stenosis. However, repeated steroid injections can weaken nearby bones and connective tissue.
• Non-steroidal Anti-Inflammatory Medications
Non-steroidal anti-inflammatory medications (NSAIDs) are commonly prescribed for patients with LSS, and often help relieve pain associated with spinal stenosis. By reducing inflammation, these medications can relieve some of the pressure on compressed nerves.
• Surgical Management
The primary goal of surgery is to decompress the affected roots.
• Physical Therapy Management
Physiotherapy for lumbar stenosis can help relieve pain and improve mobility. It can include exercises, manual therapy, and pain management techniques.
Exercises
• Stretching and range of motion: Improve mobility in your spine and extremities
• Strengthening: Strengthen your core, arms, and legs to support your spine
• Aerobic exercise: Increase your tolerance for activities like walking
• Flexion-based exercises: Open up the space in your lower back to reduce pressure on your spine
Exercise for spinal stenosis
Knees-to-chest while supine
The patient lies supine, with knees flexed and feet flat
On the floor or bed . Place the hands around the
Knees and slowly pull both knees up toward the
Chest as far as possible. This position is maintained
For 1- 2 sec, then slowly lower the feet back to the starting position. The patient must not raise the head while
Performing this exercise or straighten the legs while lowering them.
Bridging exercise
Lie on your back with your knees bent and feet flat on the floor.
Tighten your core and abdominals.
Slowly lift your hips off the floor until your body forms a straight line from your knees to your shoulders.
Keep your back straight and your arms flat on the floor.
Pelvic tilts
While lying on your back, tighten your stomach muscles and push your lower back into the floor.
Planks
Engage your core by supporting your body weight in a plank position. You can try a traditional plank or a side plank.
Lumbar Rotation
Lie on the back with the knees bent and feet flat on the floor or bed, ensuring that the knees are close together.
Gently and slowly lower both knees toward the right side, as far as is comfortable.
Bring the knees back to the starting position and repeat the movement on the left side.
Repeat on both sides around 10–20 times.
Manual therapy
• Massage: Loosen stiff joints and muscles
• Hydrotherapy: Reduce weight on your spine and improve mobility
Pain management
• Heat and cold packs: Reduce pain and inflammation
• Electrotherapy: Use ultrasound or TENS\IFT to reduce pain and speed up healing