Disease Description (Causes and Symptoms)

Disease name confirmation: Lumbar spondylolisthesis (Lumbar spondylolisthesis) — a medically accepted term.

Summary of definition and pathophysiology

Refers to a condition in which one vertebra slips forward relative to the vertebra directly below it.
Main pathophysiological mechanisms: segmental instability develops and displacement occurs and progresses due to a structural defect of the spine (pars interarticularis defect, i.e., spondylolysis) or degenerative changes in the joints and intervertebral discs. Other causes include congenital malformations (dysplasia), trauma, and ankylosing spondylitis.
The degree of displacement is generally classified into grades 1–4 (based on the percentage of displacement), which has clinical significance.

Major causes

Spondylolysis (repetitive stress during adolescence → stress fracture) — the “isthmic” type
Degenerative changes (degenerative spondylolisthesis) — instability caused by weakening of the joints and discs
Congenital (dysplasia), trauma, inflammatory diseases, etc.

Main symptoms

Low back pain (particularly worsening with activity)
Radiating pain and numbness in the lower extremities (symptoms caused by nerve root compression)
Gait disturbance and intermittent neurogenic claudication (a condition in which the legs hurt after walking only a short distance, requiring rest)
Postural abnormalities (stiffness of the lower back muscles, lordosis/slouching, changes in waist length, etc.)
In adolescents, low back pain during activity due to lumbar spondylolysis

Tests helpful for diagnosis (summary)

Plain lumbar spine X-rays (anteroposterior, lateral, flexion and extension views) — confirmation of displacement and grading
MRI — evaluation of the degree of nerve compression and the discs, ligaments, and neural structures (essential in cases with severe symptoms)
CT — detailed evaluation of bone structures and pars interarticularis defects
In some cases, a bone scan (to confirm an active fracture)

Treatment Methods

Conservative (non-surgical) treatment

Pain control: NSAIDs, short-term muscle relaxants, and oral analgesics when necessary
Physical therapy: stretching and individualized rehabilitation exercise programs to strengthen the core and stabilize the lumbar spine
Activity modification and bracing: short-term use of a brace (to protect the lower back) for adolescent spondylolysis or acute pain
Injection treatment: relief of radiating pain and inflammation through nerve root blocks (such as epidural steroid injections)
Lifestyle management: weight control, posture correction, avoidance of lifting heavy objects and excessive extension movements, and smoking cessation (smoking affects bone fusion and recovery)

Surgical treatment (indications and methods)

Indications: no improvement despite non-surgical treatment, limitations in daily functioning or severe persistent pain, progressive neurological deficits (sensory loss or decreased muscle strength), severe intermittent claudication, or, in adolescents, substantial progression of displacement (e.g., displacement of 50% or more) or a determination that there is a high risk of further displacement, among others
Surgical goals: nerve decompression (decompression surgery) and fixation of the unstable segment (spinal fusion)
Examples of procedures: posterior lumbar fusion (pedicle screw fixation) + bone grafting (bone fusion); the choice of approach, such as TLIF/PLIF/ALIF, is determined according to the location and type of lesion and the surgeon’s preference
In cases of adolescent spondylolysis, prophylactic or corrective fusion may be recommended if the displacement is severe
Complications: surgical-site infection, nerve injury, nonunion, loosening or breakage of hardware, adjacent segment disease, etc.

Precautions and self-management

Before surgery: management of smoking, diabetes, and nutritional status (these affect the success rate of fusion)
During conservative treatment: regular exercise (core strengthening), avoiding overexertion during the acute phase, and following physical therapy instructions
Long term: weight management, maintaining muscle strength, and minimizing stress on the lower back by using the knees and pelvis when lifting heavy objects

Prognosis overview

Symptoms can improve with conservative treatment in most patients with mild to moderate disease
In cases with neurological deficits or severe displacement, symptoms commonly improve after surgery, but complications and the possibility of revision surgery exist

What do you think is the exact cause of this condition?
How likely is my condition to improve with non-surgical treatment? (Including the expected time frame)
What are the major side effects of the medication you recommend?
If you determine that surgery is necessary, which surgical procedure would you recommend? What are its advantages and disadvantages?
What will the expected recovery time and timing of return to daily activities be after surgery?
How high are the risks of complications (infection, nerve injury, nonunion, etc.)?
What will the rehabilitation (physical therapy) plan be? What should I do at home?

(Related to adolescents and spondylolysis) How long will I need to wear a brace, and when can I resume exercise (especially sports)?
(Related to degenerative spondylolisthesis) If there is no improvement after conservative treatment for several weeks (or months), would you recommend surgery? What are the criteria or recommended treatment period?