What is OPLL?
Ossification of the posterior longitudinal ligament (OPLL) is a condition in which the ligament running along the back of the vertebral bodies gradually becomes thicker and turns into bone. This ligament normally helps stabilize the spine. When it becomes ossified, it can take up space within the spinal canal and potentially compress the spinal cord or spinal nerves.
OPLL most commonly affects the cervical spine (neck), although it can also occur in the thoracic or lumbar spine. Some people have OPLL without noticeable symptoms, while others develop neurological problems as the condition progresses. In severe cases, spinal cord compression can affect movement, sensation, balance, and bladder or bowel function.
What are the Causes of OPLL?
The exact cause of OPLL is not fully understood. Researchers believe that genetic, metabolic, and environmental factors may contribute to abnormal ligament bone formation. Factors associated with OPLL include:
- Genetic predisposition: OPLL tends to occur more frequently in certain families and populations.
- Age: The condition is more commonly identified in middle-aged and older adults.
- Metabolic factors: Conditions such as diabetes and abnormal glucose metabolism may be associated with an increased risk.
- Mechanical stress: Repeated stress on the spine may contribute to ligament changes.
- Other spinal conditions: Degenerative changes in the spine may occur alongside OPLL.
Having one or more of these factors does not necessarily mean a person will develop OPLL.
What are the Symptoms of OPLL?
Symptoms depend largely on the location and extent of ossification and whether the spinal cord or nerves are compressed. Possible symptoms include:
- Neck or back pain and stiffness
- Numbness or tingling in the arms, hands, legs, or feet
- Weakness in the arms or legs
- Difficulty with fine hand movements
- Problems with balance or walking
- Increased muscle stiffness or abnormal reflexes
- Electric shock-like sensations with certain neck movements
- In advanced cases, bladder or bowel problems
Some individuals have no symptoms and discover OPLL incidentally during imaging for another reason.
How is OPLL Diagnosed?
Doctors typically begin with a medical history and physical examination to assess pain, sensation, strength, reflexes, coordination, and walking ability. Imaging is essential for confirming OPLL. CT scans are particularly useful for showing the location and extent of the ossified ligament and its relationship to the spinal canal. MRI can evaluate the spinal cord, nerve roots, and areas of compression or spinal cord injury. X-rays may also help identify changes in spinal alignment and other degenerative conditions.
What are the Treatment Options for OPLL?
Treatment depends on symptoms, the degree of spinal cord compression, overall health, and whether neurological function is affected. For people with mild or no symptoms, doctors may recommend observation and periodic imaging.
Conservative treatment may include pain-relieving medications, physical therapy, activity modification, and careful monitoring. However, treatment should be individualized because certain neck injuries or excessive manipulation may be risky when significant spinal cord compression is present.
When OPLL causes substantial spinal cord or nerve compression, progressive neurological symptoms, or significant functional impairment, surgery may be considered. Surgical options can include procedures that decompress the spinal cord, such as laminoplasty or laminectomy, sometimes combined with spinal fusion. The appropriate approach depends on factors such as the location and extent of OPLL, spinal alignment, and the severity of compression.
