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M43.0 Spondylolysis – Causes, Symptoms & Treatment
M43.0 is the ICD-10 code for spondylolysis, a defect or stress fracture in the vertebral arch. It most commonly affects the lumbar spine and can cause back pain and spinal instability.
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M43.0 is the ICD-10 code for spondylolysis, a defect or stress fracture in the vertebral arch. It most commonly affects the lumbar spine and can cause back pain and spinal instability.
What is M43.0 (Spondylolysis)?
M43.0 is the ICD-10 diagnosis code for spondylolysis, a defect or stress fracture in the pars interarticularis – a small segment of bone in the vertebral arch connecting the upper and lower facet joints of a vertebra. This condition most frequently occurs in the lumbar spine, particularly at the fifth lumbar vertebra (L5).
Causes
Spondylolysis most commonly develops due to repetitive mechanical stress or overloading of the spine. Less frequently, a congenital predisposition is present. Common causes include:
- Stress fractures from repeated hyperextension movements, particularly in athletes (gymnasts, weightlifters, swimmers)
- Congenital bone weakness in the vertebral arch
- Acute trauma (less common), such as from a fall or accident
- Genetic predisposition and family history
Symptoms
Many individuals with spondylolysis experience no or only mild symptoms. When symptoms are present, they may include:
- Low back pain, sometimes radiating to the buttocks or thighs
- Pain that worsens with backward bending or prolonged standing
- Muscle tension in the lower back region
- In severe cases: numbness, tingling, or weakness in the legs (if nerves are affected)
- Reduced range of motion in the spine
Diagnosis
Diagnosis of spondylolysis is made through clinical examination and imaging studies:
- X-ray: Often the first step; the defect may appear as a "Scotty dog sign" on oblique views
- Computed tomography (CT): Provides detailed images of the bone defect
- Magnetic resonance imaging (MRI): Evaluates soft tissues and nerve structures; can detect bone stress reactions before a fracture becomes visible
- SPECT bone scan: Identifies increased bone metabolism activity in acute stress fractures
Treatment
Conservative Treatment
The majority of spondylolysis cases are managed conservatively:
- Rest and activity modification: Reduction or temporary cessation of high-impact activities
- Physiotherapy: Strengthening of core and back muscles to stabilize the spine
- Pain relief medication: Non-steroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen to reduce pain and inflammation
- Bracing / orthotics: Short-term immobilization for acute, painful stress fractures, especially in children and adolescents
Surgical Treatment
Surgery is rarely required and is only considered in cases of persistent, therapy-resistant symptoms or neurological deficits:
- Direct repair of the pars defect (e.g., using a screw-hook system)
- Spinal fusion: Surgical stabilization of the affected vertebral segments when concurrent instability (spondylolisthesis) is present
Prognosis
The prognosis for spondylolysis is generally favorable. Many patients live without significant symptoms, provided they appropriately modify their physical activity. If left untreated, spondylolysis can progress to spondylolisthesis, a condition in which one vertebra slips forward over the one below it.
References
- Standaert CJ, Herring SA. Spondylolysis: a critical review. British Journal of Sports Medicine. 2000;34(6):415-422.
- World Health Organization (WHO). ICD-10 Version 2019 – M43.0 Spondylolysis. Available at: https://icd.who.int/browse10/2019/en#/M43.0
- Foreman P, Griessenauer CJ, Watanabe K, et al. L5 spondylolysis/spondylolisthesis: a comprehensive review with an anatomic focus. Child's Nervous System. 2013;29(2):209-216.
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