Spondylolisthesis

Spondylolisthesis - Slippery Spine Secrets

• Anterior vertebral slip, one vertebra over another. Most common: L5-S1, then L4-L5.
• Wiltse Classification (Types):
  • I: Dysplastic (Congenital)
  • II: Isthmic (Pars defect) - Most common overall
  • III: Degenerative (Elderly, L4-L5 common)
  • IV: Traumatic (Non-pars fracture)
  • V: Pathologic
  • VI: Iatrogenic/Post-surgical
• Meyerding Grading (% slip):
  • Grade I: 0-25%
  • Grade II: 26-50%
  • Grade III: 51-75%
  • Grade IV: 76-100%
  • Grade V: Spondyloptosis (>100%)
• Sx: Low back pain, radiculopathy, palpable "step-off".
• Dx: Lateral X-ray (grading); Oblique X-ray (Scottie dog for pars defect).

⭐ Isthmic spondylolisthesis (Type IIA - lytic) is the most common type in adolescents.

Spondylolisthesis - Why Vertebrae Wander

• Dysplastic (Type I): Congenital facet/sacral anomalies predisposing to slip.
• Isthmic (Type II): Defect in pars interarticularis (spondylolysis).
  • Most common; often L5-S1 in young athletes (stress fracture).
• Degenerative (Type III): Facet joint arthritis & ligamentous instability.
  • Common in elderly, typically L4-L5; no pars defect.
• Traumatic (Type IV): Acute fracture in posterior elements (not pars).
• Pathological (Type V): Bone disease (e.g., tumor, Paget's) weakening vertebral structures.
• Iatrogenic (Type VI): Post-surgical destabilization.

⭐ Isthmic spondylolisthesis (Type II) is the most frequent type, often resulting from stress fractures of the pars interarticularis in adolescent athletes, especially at L5-S1 due to hyperextension activities.

Spondylolisthesis - Decoding the Discomfort

• Forward slip of one vertebra over another. Most common: L5-S1.
• Types: Isthmic (pars defect, commonest), Degenerative, Dysplastic, Traumatic, Pathologic.
• Meyerding Grades: 1 (<25%), 2 (25-50%), 3 (50-75%), 4 (75-100%), 5 (>100% Spondyloptosis).
• Symptoms: Low back pain (↑ extension), radiculopathy, hamstring tightness. Palpable step-off.
• Diagnosis: X-ray (lateral, oblique for "Scottie dog" sign in isthmic). CT/MRI.

⭐ Isthmic spondylolisthesis is most common at L5-S1 due to a pars interarticularis defect.

• Treatment: Conservative (rest, physio); Surgery (decompression, fusion) for instability/neuro deficits_._

Spondylolisthesis - Spotting the Slip

• Diagnosis:
  • Standing lateral X-ray: Essential for diagnosis, grading slip percentage. Dynamic views (flexion-extension) assess stability.
  • Oblique X-ray: "Scottie dog" sign (collar fracture) reveals pars interarticularis defect (spondylolysis).
  • CT scan: Superior for bony detail, confirming pars defect, pre-op planning.
  • MRI: Evaluates soft tissues: disc integrity, nerve root compression, canal stenosis.
• Meyerding Classification (Anterior vertebral body slippage on lateral view):
  • Grade I: 0-25%
  • Grade II: 26-50%
  • Grade III: 51-75%
  • Grade IV: 76-100%
  • Grade V (Spondyloptosis): >100% slip.

⭐ Isthmic spondylolisthesis at L5-S1 is the most common type and level, often seen in adolescent athletes.

Spondylolisthesis - Taming the Tilt

Forward slip of one vertebra over another. 📌 Types (DID TP): Dysplastic (congenital), Isthmic (pars defect, L5-S1 common, most frequent in <50y), Degenerative (L4-L5 common, >50y), Traumatic, Pathologic. Meyerding Grading (% slip):

• I: 0-25%
• II: 26-50%
• III: 51-75%
• IV: 76-100%
• V: >100% (spondyloptosis) Symptoms: Low back pain, radiculopathy, neurogenic claudication, hamstring tightness.

⭐ "Scotty dog" with a collar (fractured neck) on oblique X-ray indicates pars interarticularis defect (spondylolysis), key for isthmic type.

Management:

High‑Yield Points - ⚡ Biggest Takeaways

• Spondylolisthesis: Forward slippage of one vertebra over the one below.
• Most common is Isthmic type at L5-S1, due to pars interarticularis defect.
• Meyerding classification (Grade I-V) quantifies slip percentage.
• Key symptoms: Low back pain, radiculopathy, neurogenic claudication, hamstring tightness.
• "Scotty dog" sign on oblique X-ray suggests pars defect.
• Lateral X-rays are essential for diagnosis and grading.
• Treatment: Conservative for low grades; surgery for high grades or neuro deficits.