What Is Spondylolisthesis and Why Does It Happen?
A defect in the thin bony bridge called the pars (isthmic type) or age-related wear of the discs and facet joints (degenerative type) allows a vertebra to slip forward. The isthmic type is more common in young people and athletes, the degenerative type often in postmenopausal women. As the slip progresses, the canal and openings the nerves pass through may narrow, which explains the leg symptoms.
What Does the Grade of Slip Change?
The amount of slip is graded from 1 to 5 using the Meyerding classification. Most low-grade slips (Grade 1-2) cause mild symptoms and can usually be managed without surgery. Higher grades, or slips that progress over time, may be associated with more severe pain and neurological symptoms. Beyond the grade, whether the slip is stable or increases with movement (unstable) also guides the decision; this is assessed with standing and flexion-extension X-rays.
Non-Surgical Treatment First
Most low-grade, mildly symptomatic cases improve without surgery. The approach centers on exercises that strengthen the core and abdominal-back muscles, physiotherapy, weight management, pain-relieving/anti-inflammatory medication and, in selected patients, epidural injections. The aim is both to control pain and to reduce the load on the slip by strengthening the supporting muscles. This process takes patience; results vary from person to person.
When Is Surgery Discussed?
Surgery comes up in situations such as persistent pain unresponsive to non-surgical care, progressive muscle weakness, a marked and increasing slip, or walking limitation due to canal narrowing. The methods used are decompression to relieve nerve pressure and fusion (screw-rod and, when needed, a cage) to stabilize the slipped level; minimally invasive approaches are used in suitable cases. Loss of bladder or bowel control is an emergency and must be assessed without delay.
Recovery and Honest Expectations
After fusion, the hospital stay is usually a few days, with early mobilization and clot-prevention measures. A brace may be worn for a period per medical advice, and heavy lifting and twisting are restricted. Return to desk work takes a few weeks for most patients and to physical work a few months. In appropriately selected patients, fusion and clinical improvement rates are high; however, no outcome is guaranteed. Expectations are discussed openly from the start.