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Chondronecrosis: Causes, Symptoms and Treatment

Chondronecrosis refers to the death of cartilage tissue. It can affect joints, the ear, or the larynx and requires prompt medical attention for the best outcome.

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Things worth knowing about "Chondronecrosis"

Chondronecrosis refers to the death of cartilage tissue. It can affect joints, the ear, or the larynx and requires prompt medical attention for the best outcome.

What is Chondronecrosis?

Chondronecrosis is the localized death (necrosis) of cartilage tissue (from the Greek chondros = cartilage). Cartilage is a specialized connective tissue found in joints, the outer ear, the larynx, the nose, and the trachea. Because cartilage lacks its own blood supply, it depends entirely on nutrients diffusing from surrounding tissues. When this supply is disrupted or the tissue is damaged, the cartilage cells (chondrocytes) can die, leading to chondronecrosis.

Causes

Chondronecrosis can be triggered by a range of factors:

Radiation therapy: Ionizing radiation, particularly during treatment of head and neck tumors, can directly damage cartilage tissue (radionecrosis of cartilage).
Infections: Bacterial infections such as perichondritis can disrupt cartilage nutrition and lead to tissue death.
Trauma: Injuries that crush or tear the tissues surrounding cartilage.
Circulatory disorders: Interruption of blood flow to adjacent tissue, as seen in avascular necrosis affecting joint cartilage.
Mechanical overload: Chronic pressure or friction, particularly in joint areas.
Autoimmune diseases: Inflammatory conditions such as relapsing polychondritis can attack cartilage structures throughout the body.

Commonly Affected Sites

Laryngeal cartilage: Especially following radiation therapy to the neck (laryngeal chondronecrosis).
Outer ear (auricle): After infections, trauma, or piercing complications.
Joints: Particularly the knee, hip, and shoulder in avascular necrosis with cartilage involvement.
Nasal septum: Less commonly, following injury or infection.

Symptoms

Symptoms vary depending on the affected site but may include:

Pain and tenderness in the affected area
Swelling and redness (signs of inflammation)
Deformity of the cartilage structure (e.g., cauliflower ear, nasal collapse)
Functional impairment: voice changes or difficulty swallowing when the larynx is involved
Restricted joint mobility when joint cartilage is affected
Fistula formation or open wounds in severe cases

Diagnosis

The diagnosis of chondronecrosis is based on clinical findings and imaging:

Physical examination: Inspection and palpation of the affected region.
Imaging: CT (computed tomography) or MRI (magnetic resonance imaging) to assess the extent of necrosis.
Endoscopy: For suspected laryngeal chondronecrosis to directly visualize the larynx.
Biopsy: In unclear cases to rule out tumors or other conditions.

Treatment

Treatment depends on the cause, severity, and location of the necrosis:

Conservative Treatment

Antibiotics for bacterial infection
Pain management and anti-inflammatory therapy
Hyperbaric oxygen therapy (HBO): Increases tissue oxygenation and can be beneficial for radiation-induced necrosis

Surgical Treatment

Surgical removal (debridement) of necrotic tissue
Reconstructive procedures to restore cartilage structure (e.g., cartilage grafting)
In severe cases: partial or complete removal of the affected cartilage (e.g., laryngectomy for extensive laryngeal necrosis)

Prognosis

The prognosis of chondronecrosis depends strongly on its cause, severity, and the timing of treatment. Early diagnosis and prompt intervention significantly improve outcomes. Radiation-induced chondronecrosis may follow a prolonged course and often requires interdisciplinary care involving oncologists, surgeons, and rehabilitation specialists.

References

Pfreundner L, Willner J, Baier K et al. - Laryngeal chondronecrosis after radiotherapy. Strahlentherapie und Onkologie, 2000.
Marx RE - Osteoradionecrosis: A new concept of its pathophysiology. Journal of Oral and Maxillofacial Surgery, 1983.
European Society for Head and Neck Oncology - Guidelines on the management of cartilage disorders, 2020.

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