Kyphosis (Humpback): Causes, Degrees, and Treatment Methods

Kyphosis (Hunchback): Causes, Degrees, and Treatment Methods

Kyphosis is defined as an abnormal forward curvature of the spine. Commonly known as a “hunchback,” this condition is not only an aesthetic issue; it is a medical condition that can lead to serious health problems such as pain, shortness of breath, and nerve compression. While it is most commonly seen in the upper region of the spine (thoracic region), it can also affect the lumbar and cervical vertebrae.

Kyphosis is a spinal disorder that can be largely brought under control with an accurate diagnosis and timely treatment. In mild cases, physical therapy and posture exercises are extremely effective. In severe cases, modern spinal surgery performed with osteotomy techniques permanently corrects the spinal alignment of patients and significantly improves their quality of life.

If you notice a hunchback, back pain, or postural deformity in your spine, we recommend that you consult an orthopedics and traumatology specialist or a spinal surgeon to have a Cobb angle measurement performed.

What is kyphosis? How does it develop?

In a healthy spine, there is a physiological (normal) forward curvature between 20° and 40° in the thoracic (chest) region. When this angle exceeds 45°–50°, it is clinically referred to as kyphosis. The degree of curvature is measured using the Cobb angle method: the angle between the uppermost and lowermost tilted vertebrae is calculated on an X-ray image of the spine.

The main causes of kyphosis are:

  • Postural kyphosis (posture deformity): Develops as a result of long-term poor sitting and standing habits; it usually does not involve a structural deformity.
  • Scheuermann’s kyphosis: A structural form that appears during the growth phase when vertebral bodies are shaped like wedges.
  • Degenerative kyphosis: Occurs in advanced age due to loss of disc height and vertebral collapse.
  • Osteoporotic compression fractures: Occurs due to the collapse of vertebrae as a result of bone loss.
  • Congenital kyphosis: Stems from developmental anomalies of the spine.
  • Neuromuscular causes: Develops due to diseases such as cerebral palsy and muscular dystrophy.
  • Iatrogenic kyphosis: Can emerge as a result of previous spinal surgeries or radiotherapy.

Kyphosis Grading

The severity of kyphosis is divided into four main groups according to the Cobb angle. This classification forms the cornerstone of treatment decisions:

Degree Cobb Angle Clinical Presentation Treatment Approach
Mild 45°–55° Mild hunchback, postural issues, occasional pain Exercise, posture training, physical therapy
Moderate 55°–70° Prominent deformity, back pain, shoulder imbalance Bracing, physical therapy, pain management
Severe 70°–90° Serious deformity, respiratory restriction, risk of nerve compression Bracing + intensive physical therapy or surgical evaluation
Very Severe >90° Cardiopulmonary insufficiency, risk of neurological complications Surgical treatment is generally mandatory

Non-Surgical Treatment Methods

In the vast majority of mild and moderate kyphosis cases, surgery is not required. Conservative treatment aims to strengthen the muscles supporting the spine, increase flexibility, and stop the progression of the curvature.

1. Physical Therapy and Exercise

Physical therapy is the most important pillar of conservative treatment. The goals are:

  • Strengthening of the thoracic extensor and core muscles
  • Stretching of the pectoral and hip flexor muscles
  • Scapular stabilization exercises
  • Spinal re-education based on Pilates and the McKenzie method
  • Breathing exercises (to protect lung capacity in severe cases)

2. Brace (Orthosis) Therapy

In growing patients (especially in Scheuermann’s kyphosis), brace therapy is effective in preventing the progression of the curvature. The Milwaukee brace and modified TLSO (thoracolumbar sacral orthosis) are the most commonly used models.

The key point in brace therapy is a usage period of 16–23 hours per day until skeletal maturation is complete. In adults, braces are generally used for pain control, especially for short periods in osteoporotic patients.

3. Pain Management and Medication

The following methods are applied in the management of pain related to kyphosis:

  • NSAIDs (non-steroidal anti-inflammatory drugs): Used for short periods during acute pain episodes.
  • Muscle relaxants: Can be given as supplementary treatment for paravertebral muscle spasms.
  • Osteoporosis treatment: Bisphosphonates and Vitamin D / calcium supplementation reduce the risk of fractures by increasing bone density.
  • Epidural steroid injections: Can be applied for radicular pain due to nerve root compression.

4. Manual Therapy and Complementary Approaches

Osteopathy, medical massage, and chiropractic manipulation can accompany physical therapy to reduce muscle tension and improve postural balance. Holistic approaches such as yoga and tai chi increase balance, flexibility, and quality of life, especially in middle-aged and older patients. While these methods cannot correct structural curvature on their own, they are valuable as supportive treatments.

Surgical Treatment: For whom and how?

Surgical treatment comes to the fore in severe kyphosis cases that do not respond to conservative methods, show rapid progression, or present neurological symptoms. In surgical treatment, spinal alignment is corrected using osteotomy (bone incision) techniques, significantly increasing the patient’s quality of life.

Cases Where Surgery Provides Benefit

  • Cobb angle exceeding 70°–75° and being resistant to conservative treatment
  • Progressive deformity (progression of more than 5° per year)
  • Neurological deficit due to spinal cord or nerve root compression
  • Serious cardiopulmonary dysfunction (respiratory capacity falling below 50%)
  • Uncontrolled pain and functional limitation despite conservative treatment
  • Selected cases where cosmetic concerns negatively affect the patient’s quality of life

Osteotomy Techniques

Osteotomy is the process of cutting and removing bone tissue from the vertebra to allow for the realignment of the spine. Different techniques are chosen according to the severity of the deformity and the need for correction:

Smith-Petersen Osteotomy (SPO)

A correction of 10°–15° is achieved at each level by removing the facet joints. It is preferred in mild and moderate flexible curvatures.

Pedicle Subtraction Osteotomy (PSO)

A correction of 25°–35° is obtained by taking a wedge-shaped bone from a single vertebra. It is frequently applied in rigid kyphosis cases; it is a more aggressive but more powerful technique.

Vertebral Column Resection (VCR)

One or several vertebrae are completely removed; a correction of 40°–50° and above is possible. It is applied as a last resort in very severe, rigid deformities and requires high technical skill.

Anterior-Posterior Combined Surgery

Procedures performed from both the front (anterior) and the back (posterior) are applied together in some cases to ensure a more stable correction.

Instrumentation and Fusion

The position corrected after osteotomy is stabilized with pedicle screw-rod systems consisting of titanium screws, rods, and hooks. In addition, bone union (fusion/arthrodesis) is ensured between the vertebrae using autologous bone grafts or synthetic bone substitutes. Fusion guarantees long-term stability.

Minimal Surgical Techniques

With the advancement of technology, robotic navigation systems and minimally invasive techniques make it possible to reduce blood loss and the risk of complications, especially in elderly or comorbid patients. Thoracoscopic anterior release, percutaneous screw placement, and intraoperative neurophysiological monitoring (IONM) have become integral parts of modern kyphosis surgery.

Post-Surgical Recovery Process

A comprehensive rehabilitation process begins after kyphosis surgery. A typical recovery schedule can be summarized as follows:

  • First 1–3 days: Intensive care monitoring, breathing exercises, beginning of mobilization (standing up)
  • First 6 weeks: Movement restriction, brace use, superficial walking program
  • 6 weeks – 3 months: Gradual physical therapy, beginning of muscle strengthening
  • 3–6 months: Return to daily living activities, driving, and starting light work
  • 6–12 months: Radiological fusion control, gradual transition to sports and heavy physical activity
  • 1 year and beyond: Long-term follow-up; usually control X-rays in the 2nd and 5th years