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M40.1 – Secondary Kyphosis: Causes & Treatment

M40.1 is the ICD-10 code for other secondary kyphosis – an abnormal backward curvature of the spine. It develops as a consequence of an underlying condition and may cause pain and restricted mobility.

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Things worth knowing about "M40.1"

M40.1 is the ICD-10 code for other secondary kyphosis – an abnormal backward curvature of the spine. It develops as a consequence of an underlying condition and may cause pain and restricted mobility.

Definition and Classification

M40.1 is a diagnostic code from the International Classification of Diseases (ICD-10) representing other secondary kyphosis. This refers to a pathological, i.e. disease-related, curvature of the spine in the sagittal plane directed posteriorly (backward), occurring as a consequence of another underlying condition. Unlike primary or idiopathic kyphosis, secondary kyphosis always has an identifiable cause.

Causes

Secondary kyphosis can develop due to a variety of underlying diseases or external factors:

Osteoporosis: Vertebral body fractures caused by reduced bone density frequently lead to kyphotic malalignment.
Scheuermann disease: A growth disorder of the vertebral bodies during adolescence that results in wedge-shaped deformities.
Inflammatory diseases: For example, ankylosing spondylitis (Morbus Bechterew) or other rheumatic conditions.
Tumors and metastases: Vertebral bodies can collapse due to tumor involvement, causing kyphosis.
Trauma: Vertebral fractures following accidents.
Neuromuscular diseases: Muscle weakness or spasticity can chronically affect spinal posture.
Postoperative changes: Secondary kyphosis may develop following spinal surgery.

Symptoms

The symptoms of M40.1 depend greatly on the degree of kyphosis and the underlying condition. Common symptoms include:

Visibly rounded or hunched back (kyphotic posture)
Back pain, especially in the affected spinal segment
Restricted mobility of the spine
Muscle tension and pain
In severe cases: neurological symptoms such as numbness, tingling, or weakness in the limbs due to nerve compression
Breathing difficulties in pronounced thoracic kyphosis
Reduction in body height

Diagnosis

Diagnosis of secondary kyphosis is made using a combination of examination methods:

Clinical examination: Assessment of spinal posture, range of motion, and muscle tension by the physician.
X-rays: Measurement of the kyphosis angle (e.g., using the Cobb method) and evaluation of vertebral body shape.
MRI (Magnetic Resonance Imaging): Detailed visualization of intervertebral discs, nerves, spinal cord, and soft tissue structures.
CT (Computed Tomography): Precise assessment of bone structure, especially when fracture is suspected.
Laboratory tests: To rule out inflammatory or metabolic causes (e.g., bone density measurement for osteoporosis).

Treatment

Therapy is guided by the underlying cause, the extent of the kyphosis, and the individual symptoms of the patient.

Conservative Treatment

Physiotherapy: Strengthening of back muscles, improvement of posture and mobility.
Pain management: Use of analgesics and anti-inflammatory medications.
Orthoses and braces: Spinal support and stabilization, especially in growing patients.
Treatment of the underlying condition: For example, osteoporosis therapy with calcium, vitamin D, and bisphosphonates.

Surgical Treatment

In cases of severe or progressive kyphosis, or when neurological complications are present, surgical correction (e.g., spinal fusion or spondylodesis) may be necessary.
Minimally invasive procedures such as kyphoplasty or vertebroplasty are used for osteoporotic vertebral fractures.

Prognosis

The course of secondary kyphosis depends strongly on the underlying cause. With early treatment of the primary condition and consistent physiotherapeutic management, progression can often be halted or slowed. Severe cases, however, may lead to permanent functional limitations.

References

World Health Organization (WHO): International Statistical Classification of Diseases and Related Health Problems, 10th Revision (ICD-10). Available at: https://www.who.int/standards/classifications/classification-of-diseases
Herkowitz, H.N. et al.: Rothman-Simeone and Herkowitz's The Spine. 7th Edition, Elsevier, 2021.
Glassman, S.D., Bridwell, K., Dimar, J.R.: The Relationship Between Lordosis and Clinical Outcomes After Spinal Fusion. Spine, 2005; 30(19):2197–2203.

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