Cartilage Repair and Joint Preservation
Advanced cartilage restoration, knee preservation, and biological joint care
Understanding cartilage injury
Articular cartilage is the smooth, specialised tissue covering the ends of bones within the knee joint. It allows low-friction movement, absorbs load, and protects underlying bone during walking, running, and sport.
Unlike many tissues, cartilage has limited natural healing capacity due to its poor blood supply. As a result, untreated cartilage injury may lead to persistent pain, swelling, mechanical symptoms, and progressive joint degeneration.
Cartilage injury may occur:
Following sporting trauma or twisting injury
After direct impact or osteochondral fracture
Through repetitive loading or overuse
As a result of joint instability or malalignment
Gradually with tissue wear over time
Early diagnosis and appropriate treatment are important to preserve joint health and delay arthritis progression.
Symptoms of cartilage injury
Common symptoms include:
Localised knee pain
Swelling or recurrent joint effusions
Catching, clicking, or locking sensations
Pain with stairs, squatting, or impact activity
Reduced sporting performance
Stiffness or reduced range of motion
Symptoms may vary depending on defect size, location, and associated injuries.
Diagnosis
Assessment includes:
Detailed history and physical examination
X-rays to assess alignment and joint preservation
MRI to evaluate cartilage surfaces, subchondral bone, and associated pathology
CT or advanced imaging in selected cases
Imaging findings are interpreted alongside symptoms, examination, age, activity level, and long-term goals.
Non-operative treatment
Not all cartilage injuries require surgery.
Conservative treatment may include:
Physiotherapy focused on strength and movement control
Activity modification
Weight optimisation
Anti-inflammatory medication
Injection therapies where appropriate
Bracing or offloading strategies in selected cases
The goal is symptom control, functional improvement, and joint preservation.
When is surgery considered?
Surgical intervention may be appropriate when:
Symptoms persist despite structured rehabilitation
Focal cartilage defects are causing pain or mechanical symptoms
Unstable cartilage fragments are present
Athletic or functional demands are limited by symptoms
Joint preservation is a priority in younger or active patients
The overall aim is to preserve native joint function wherever possible.
Cartilage repair and restoration techniques
Treatment is individualised based on:
Defect size
Location
Bone involvement
Patient age
Activity level
Alignment and stability
Restoration techniques may include:
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Small holes are created in underlying bone to stimulate a healing response and fibrocartilage formation.
Best suited for:
Smaller focal defects
Selected younger patients
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Healthy cartilage and bone plugs are transferred from a lower-load region to repair damaged areas.
Advantages:
Restores native hyaline cartilage
Suitable for focal defects
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Larger defects may be reconstructed using donor cartilage and bone tissue.
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Cartilage cells are harvested, cultured, and re-implanted to restore larger defects.
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In acute osteochondral injuries, cartilage or bone fragments may be repaired and stabilised.
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Modern cartilage restoration may incorporate:
Biological scaffolds
Growth factors
Bone marrow aspirate concentrate (BMAC)
PRP in selected settings
These strategies aim to enhance healing and improve tissue integration.
Role of alignment and joint mechanics
Successful cartilage restoration often requires correction of contributing factors such as:
Malalignment
Ligament instability
Meniscal deficiency
Patellar maltracking
Additional procedures such as osteotomy, ligament reconstruction, or patellofemoral realignment may sometimes be required to optimise long-term outcomes.
Recovery and rehabilitation
Rehabilitation following cartilage surgery is essential and often longer than simpler arthroscopic procedures.
Recovery focuses on:
Protecting the repair site
Gradual restoration of motion
Progressive strengthening
Controlled return to weight-bearing
Sport-specific retraining where appropriate
Typical timelines:
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Protected weight-bearing depending on procedure
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Progressive strength and mobility
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Functional rehabilitation
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Return to higher-level sport or impact activity depending on treatment type
Recovery is tailored to the procedure performed and patient goals.
Key points to remember
Cartilage injuries can significantly affect long-term knee health
Early recognition may improve joint preservation opportunities
Not all defects require surgery
Modern cartilage repair focuses on restoration, preservation, and biological healing
Treatment must be individualised
Rehabilitation is critical to outcome success
Frequently Asked Questions
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Cartilage has limited healing potential due to poor blood supply. Small defects may become less symptomatic, but true restoration often requires specialised intervention.
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No. Many patients improve with rehabilitation, load management, and non-operative care.
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There is no universal solution. The best option depends on:
Defect size
Location
Bone involvement
Patient age
Functional goals
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Recovery depends on the procedure but may range from several months to over a year for advanced restoration.
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Yes. Untreated or progressive cartilage loss may increase the risk of degenerative joint changes over time.
Key takeaway
Cartilage repair surgery focuses on preserving native joint surfaces, restoring function, and delaying arthritis progression.
Modern techniques increasingly combine biological restoration with precise surgical strategies to optimise long-term knee health.
When to Seek Assessment
If you experience:
Persistent knee pain
Swelling
Mechanical symptoms
Locking or catching
Reduced sporting capacity
Orthopaedic assessment can help define the cause and determine whether joint-preserving treatment is appropriate.