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Chondromalacia: Causes, Symptoms & Treatment

Chondromalacia refers to the softening and breakdown of articular cartilage. It most commonly affects the kneecap and causes joint pain and restricted movement.

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Things worth knowing about "Chondromalacia"

Chondromalacia refers to the softening and breakdown of articular cartilage. It most commonly affects the kneecap and causes joint pain and restricted movement.

What is Chondromalacia?

Chondromalacia (also referred to as cartilage softening) is a degenerative condition in which articular cartilage loses its normal firmness and structure. The cartilage becomes softer, rougher, and may progressively fragment or wear away over time. The condition most frequently affects the kneecap (patella), in which case it is specifically termed chondromalacia patellae. However, chondromalacia can affect the cartilage of any joint in the body, including the hip, shoulder, or ankle.

Causes

Chondromalacia can be triggered by a variety of factors:

Mechanical overuse: Repetitive stress from sports, heavy physical labor, or excess body weight causes gradual cartilage damage.
Patellar malalignment: Improper tracking of the kneecap increases friction and wear on the cartilage surface.
Injury: Direct trauma such as falls or blunt impacts can damage the cartilage.
Muscular imbalances: Unequal strength in the thigh muscles leads to increased pressure on the joint cartilage.
Age: With advancing age, cartilage tissue naturally loses elasticity and its ability to regenerate.
Inflammatory conditions: Rheumatoid arthritis and other inflammatory joint diseases can contribute to cartilage softening.

Symptoms

The typical symptoms of chondromalacia include:

Joint pain, especially when climbing stairs, squatting, or sitting for extended periods (at the knee: known as the cinema sign).
Grinding or crackling sensations (crepitus) in the affected joint.
Swelling and warmth around the joint during periods of increased inflammation.
Limited range of motion and a feeling of joint instability.
Activity-related pain that often improves with rest.

Grades of Severity

Chondromalacia is classified according to the Outerbridge grading system into four degrees of severity:

Grade I: Softening and swelling of the cartilage without surface defects.
Grade II: Superficial fissures and cracks with a diameter of up to 1.3 cm.
Grade III: Deep fissures and fragmentation with a diameter exceeding 1.3 cm.
Grade IV: Complete loss of cartilage down to the underlying bone.

Diagnosis

The diagnosis is established through several examination methods:

Clinical examination: The physician assesses pain, range of motion, and joint stability, using specific tests such as the Clarke sign for the patella.
Imaging: X-rays reveal bony changes; MRI (magnetic resonance imaging) is the preferred method for detailed visualization of cartilage damage.
Arthroscopy: Direct joint inspection allows precise assessment and simultaneous treatment of the cartilage lesion.

Treatment

Conservative Treatment

Mild to moderate cases are initially managed with non-surgical approaches:

Physiotherapy: Targeted muscle strengthening to offload the joint and improve patellar tracking.
Activity modification: Reduction of pain-triggering activities and avoidance of overloading the joint.
Pain management: Non-steroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen to relieve pain and reduce inflammation.
Orthoses and insoles: Supportive devices to improve joint alignment and guidance.
Weight management: Reducing excess body weight to lower mechanical stress on the joints.

Surgical Treatment

Higher-grade cartilage damage (Grade III–IV) or failure of conservative measures may require surgical intervention:

Chondroplasty: Arthroscopic smoothing of the damaged cartilage surface.
Microfracturing: Small drill holes in the bone stimulate the formation of fibrocartilage as a repair tissue.
Autologous chondrocyte implantation (ACI): Harvesting, culturing, and reimplanting the patient's own cartilage cells.
Osteochondral autograft transfer (OATS): Transplantation of cartilage-bone plugs from less load-bearing areas of the joint.

Prevention

The following measures can help reduce the risk of developing chondromalacia:

Regular low-impact exercise (e.g., swimming, cycling) to strengthen the muscles surrounding the joint.
Avoiding overuse and abrupt changes in physical activity levels.
Adequate warm-up before sporting activities.
Using appropriate footwear and orthopedic aids when joint malalignment is present.
Maintaining a healthy body weight to minimize joint loading.

References

Outerbridge RE. The etiology of chondromalacia patellae. Journal of Bone and Joint Surgery, 1961; 43-B(4):752–757.
Buckwalter JA, Mankin HJ, Grodzinsky AJ. Articular cartilage and osteoarthritis. Instructional Course Lectures, 2005; 54:465–480.
Mithoefer K, Williams RJ, Warren RF, et al. The microfracture technique for the treatment of articular cartilage lesions in the knee. Journal of Bone and Joint Surgery, 2005; 87-A(9):1911–1920.

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