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M40.0 – Round Back: Causes & Treatment
M40.0 is the ICD-10 code for round back (hyperkyphosis), an excessive backward curvature of the spine, primarily affecting the thoracic region.
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M40.0 is the ICD-10 code for round back (hyperkyphosis), an excessive backward curvature of the spine, primarily affecting the thoracic region.
What is M40.0 – Round Back?
M40.0 is the ICD-10 diagnosis code for round back, also known as hyperkyphosis. It describes an abnormally exaggerated backward curvature of the spine, most commonly occurring in the thoracic (mid-back) region. While a mild degree of kyphosis is a normal part of spinal anatomy, in round back the curvature is significantly excessive and may cause symptoms or functional limitations.
Causes
Round back can result from various underlying conditions:
- Postural: Prolonged sitting, lack of physical activity, or poor posture are common causes, especially in adolescents and office workers.
- Scheuermann disease: A growth disorder of the vertebral bodies occurring during adolescence that leads to structural kyphosis.
- Degenerative changes: Age-related wear of intervertebral discs and vertebrae can cause or worsen kyphosis.
- Osteoporosis: Bone loss leading to vertebral compression fractures that cause the spine to curve forward.
- Congenital: Rarely, malformation of vertebral bodies present from birth.
- Neuromuscular conditions: Diseases such as muscular dystrophy or cerebral palsy can also lead to round back.
Symptoms
Symptoms vary depending on the severity of the condition:
- Visibly hunched or forward-bent posture
- Back pain, especially in the thoracic spine area
- Muscle tension and weakness in the back
- Reduced spinal mobility and flexibility
- In severe cases: breathing difficulties due to reduced chest capacity
- Neurological symptoms if the spinal cord is compressed (rare)
Diagnosis
The diagnosis of round back is established through:
- Physical examination: Assessment of posture, spinal alignment, and range of motion.
- X-ray imaging: Measurement of the curvature angle using the Cobb method. A kyphosis angle exceeding 45° is generally considered clinically significant.
- MRI or CT scan: Used when involvement of intervertebral discs, nerves, or the spinal cord is suspected.
- Bone density scan (DXA): Recommended in older patients to rule out osteoporosis as an underlying cause.
Treatment
Treatment depends on the cause and severity of the condition:
Conservative Treatment
- Physiotherapy: Targeted exercises to strengthen the back and abdominal muscles and improve posture.
- Postural training: Particularly effective for postural round back, especially in younger patients.
- Orthotic bracing: In children and adolescents with Scheuermann disease, a brace may slow progression of the curvature.
- Pain management: Analgesics and anti-inflammatory medications as needed.
- Osteoporosis treatment: Specific pharmacological therapy when osteoporosis is the underlying cause.
Surgical Treatment
Surgery is reserved for severe cases with significant progression, neurological deficits, or major impairment of quality of life. The procedure typically involves spinal realignment and fusion (spondylodesis) to stabilize the spine.
References
- World Health Organization: ICD-10 Classification of Diseases, Version 2019 – M40.0 Postural kyphosis.
- Lowe T.G. et al.: Scheuermann disease. In: Journal of Bone and Joint Surgery, 2004;86(11):2571–2579.
- Glassman S.D. et al.: The impact of positive sagittal balance in adult spinal deformity. Spine, 2005;30(18):2024–2029.
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