Cartilage Injuries

Cartilage injuries occur when the smooth tissue covering the ends of bones inside a joint is damaged. Articular cartilage allows the joint surfaces to move with minimal friction and helps distribute mechanical load. Because cartilage has a limited ability to heal on its own, untreated defects can sometimes lead to persistent pain, swelling, mechanical symptoms, and progressive joint degeneration.

Cartilage damage can occur after sports injuries, joint trauma, repetitive overload, osteochondral lesions, instability, malalignment, or degenerative disease. Treatment depends on the size and depth of the defect, its location, the patient's age and activity level, joint alignment, associated ligament or meniscus injuries, and the overall condition of the joint.

What Is Articular Cartilage?

Articular cartilage is a smooth, specialized tissue covering the ends of bones inside synovial joints.

It reduces friction, distributes load, and allows smooth joint movement.

Unlike many other tissues, articular cartilage has no direct blood supply. This limited vascularity is one reason why full-thickness cartilage injuries have a poor natural healing capacity.

What Is a Cartilage Injury?

A cartilage injury is damage to the articular surface of a joint.

The defect may involve only the superficial cartilage layer or extend through the full thickness of the cartilage to the underlying subchondral bone.

Some defects occur suddenly after trauma, while others develop gradually because of chronic overload or degeneration.

Which Joints Can Develop Cartilage Injuries?

Cartilage injuries can occur in many joints, including:

• Knee
• Ankle
• Hip
• Shoulder
• Elbow
• Wrist

The knee and ankle are particularly common locations for focal cartilage and osteochondral injuries.

What Causes Cartilage Damage?

Possible causes include:

• Sports injuries
• Twisting injuries
• Direct trauma
• Patellar dislocation
• Ligament injuries
• Meniscus injuries or loss of meniscal tissue
• Joint instability
• Malalignment
• Osteochondritis dissecans
• Osteochondral fractures
• Repetitive overload
• Degenerative joint disease

What Is a Traumatic Cartilage Injury?

A traumatic cartilage injury occurs after a sudden mechanical event such as a fall, twisting injury, sports collision, patellar dislocation, or fracture.

The injury may involve cartilage alone or both cartilage and the underlying bone.

What Is an Osteochondral Injury?

An osteochondral injury involves both the articular cartilage and the bone directly underneath it.

These injuries are important because the subchondral bone has a blood supply and may influence healing, pain, and treatment selection.

What Is a Chondral Injury?

A chondral injury involves the cartilage surface without a substantial piece of underlying bone.

Depending on depth, it may range from superficial softening or fissuring to a full-thickness defect exposing subchondral bone.

What Is a Full-Thickness Cartilage Defect?

A full-thickness defect extends through the complete depth of the articular cartilage.

Once the underlying bone is exposed, spontaneous restoration of normal hyaline cartilage is limited.

This does not mean every full-thickness defect requires surgery, but defect size, symptoms, location, and patient factors become especially important.

What Are the Symptoms of Cartilage Injuries?

Possible symptoms include:

• Joint pain
• Swelling
• Stiffness
• Clicking or catching
• Grinding sensation
• Reduced range of motion
• Pain during stairs, squatting, running, or jumping
• Joint locking if a loose fragment is present

Can Cartilage Damage Cause Swelling?

Yes.

An irritated joint can produce excess synovial fluid, leading to recurrent swelling after activity.

Swelling is not specific to cartilage damage and can also occur with meniscus injuries, ligament injuries, arthritis, and other joint conditions.

Can Cartilage Injuries Cause Locking?

They can.

A cartilage or osteochondral fragment can sometimes become unstable or detach, creating a loose body within the joint.

This can cause catching or true mechanical locking.

Can Cartilage Damage Be Painless?

Yes.

Some cartilage defects are discovered incidentally on MRI or during arthroscopy and may not be the cause of the patient's symptoms.

Imaging findings must therefore be interpreted together with examination and symptom location.

How Are Cartilage Injuries Diagnosed?

Diagnosis begins with the history of the injury and a detailed joint examination.

The evaluation may assess:

• Location of pain
• Joint swelling
• Range of motion
• Mechanical catching or locking
• Ligament stability
• Meniscus findings
• Patellar tracking
• Lower-limb alignment
• Muscle strength

Are X-Rays Useful?

Yes, although cartilage itself is not directly visible on standard X-rays.

X-rays can help evaluate joint alignment, osteoarthritis, bone abnormalities, osteochondral fragments, and other causes of pain.

Why Are Weight-Bearing X-Rays Important?

In the knee and other load-bearing joints, standing X-rays can show how the joint behaves under normal body weight.

They are particularly useful for evaluating malalignment and the amount of remaining joint space.

When Is MRI Used?

MRI is one of the most useful imaging methods for cartilage evaluation.

It can help show:

• Cartilage defect location
• Defect size and depth
• Subchondral bone changes
• Bone marrow edema
• Osteochondral lesions
• Meniscus injuries
• Ligament injuries
• Loose bodies

Can MRI Show the Exact Severity of Every Cartilage Injury?

MRI provides valuable information, but very small or superficial defects may be difficult to characterize perfectly.

Arthroscopy can sometimes provide more direct assessment of cartilage surface quality when surgery is already indicated for clinical reasons.

How Are Cartilage Injuries Graded?

Cartilage damage can be classified according to depth and surface appearance.

One commonly used system is the International Cartilage Repair Society classification.

What Are the Grades of Cartilage Damage?

Do Cartilage Injuries Heal Naturally?

Articular cartilage has limited self-healing capacity because it lacks a direct blood supply.

Small superficial lesions may remain stable or become asymptomatic, but full-thickness cartilage defects do not usually regenerate normal hyaline cartilage on their own.

Does Cartilage Grow Back?

Normal articular cartilage has very limited regenerative capacity.

Some surgical techniques stimulate formation of repair tissue, while others attempt to restore the defect with cartilage-containing grafts or cultured cells.

The repair tissue created by different procedures is not always identical to the original cartilage.

Does Every Cartilage Injury Require Surgery?

No.

Small, stable, minimally symptomatic lesions may be treated without surgery.

Surgery is generally considered when symptoms remain significant, the lesion is mechanically unstable, a loose body is present, or a focal defect is suitable for cartilage-restoration treatment.

Non-Surgical Treatment for Cartilage Injuries

Non-surgical treatment may include:

• Temporary activity modification
• Reduction of high-impact loading
• Physical therapy
• Strengthening around the joint
• Weight management when medically relevant
• Medication when appropriate
• Selected injections
• Correction of movement and training errors

What Is the Role of Physical Therapy?

Physical therapy can improve muscle strength, joint control, flexibility, movement quality, and load distribution.

In knee cartilage injuries, strengthening the quadriceps, hip muscles, and surrounding kinetic chain can reduce stress on the symptomatic joint surface.

Can Exercise Repair Cartilage?

Exercise does not directly regrow a full-thickness cartilage defect.

However, appropriate exercise can improve joint function, muscle support, load tolerance, and symptoms.

Excessive impact during an irritable phase may worsen symptoms, so exercise should be progressed according to tolerance.

Are Injections Used for Cartilage Injuries?

Selected injections may be used to reduce symptoms in certain patients.

These treatments may influence pain or inflammation but should not be presented as a method that reliably regrows a missing cartilage surface.

Can Hyaluronic Acid Regrow Cartilage?

Hyaluronic acid injections may improve symptoms in selected joint conditions, but they do not reliably reconstruct a full-thickness focal cartilage defect.

Can PRP Regrow Cartilage?

Platelet-rich plasma may improve pain and function in selected patients, particularly in some degenerative joint conditions.

Evidence does not support describing PRP as a guaranteed method for restoring normal articular cartilage in a focal defect.

When Is Arthroscopy Used?

Arthroscopy allows the surgeon to examine the cartilage surface directly and treat selected associated problems through small incisions.

Depending on the lesion, arthroscopy may be used for stabilization of an unstable cartilage flap, removal or fixation of loose bodies, debridement, microfracture, or other cartilage procedures.

What Is Arthroscopic Debridement?

Arthroscopic debridement removes unstable cartilage fragments or loose tissue that can cause mechanical irritation.

It can improve symptoms in selected focal mechanical lesions but does not restore missing cartilage.

What Is Chondroplasty?

Chondroplasty is an arthroscopic procedure that smooths unstable cartilage edges and removes loose or damaged tissue.

The goal is to create a more stable cartilage margin rather than regenerate a new normal cartilage layer.

What Is Microfracture?

Microfracture is a bone-marrow stimulation procedure used for selected full-thickness cartilage defects.

Small openings are created in the subchondral bone so marrow cells and blood can enter the defect and form repair tissue.

The resulting tissue is generally fibrocartilage rather than normal native hyaline cartilage.

Who May Be Suitable for Microfracture?

Microfracture may be considered for selected smaller, contained focal defects, particularly when the surrounding joint environment is favorable.

Age, activity demands, lesion size, location, previous surgery, bone condition, and joint alignment all influence suitability.

What Is Osteochondral Autograft Transfer?

Osteochondral autograft transfer uses small plugs of the patient's own cartilage and underlying bone taken from a lower-load area of the joint.

These plugs are transferred into the cartilage defect.

The technique is also known as mosaicplasty when multiple plugs are used.

What Is Mosaicplasty?

Mosaicplasty is a form of osteochondral autograft transplantation in which several cylindrical bone-and-cartilage plugs are used to fill a focal defect.

It may provide mature hyaline cartilage at the transplanted surfaces but is limited by the amount of donor tissue available.

What Is Osteochondral Allograft Transplantation?

Osteochondral allograft transplantation uses donor cartilage and underlying bone to replace a larger damaged area.

It can be useful in selected larger osteochondral defects, particularly when both cartilage and subchondral bone require reconstruction.

What Is Autologous Chondrocyte Implantation?

Autologous chondrocyte implantation is a cartilage-restoration technique using the patient's own cartilage cells.

Cartilage cells are collected, expanded in a laboratory, and later implanted into the defect using a specialized technique.

It is generally considered for selected larger symptomatic focal defects in appropriate patients.

What Is MACI?

Matrix-induced autologous chondrocyte implantation, or MACI, uses cultured cartilage cells placed on a scaffold that is implanted into the cartilage defect.

It is one of the cell-based cartilage restoration techniques used in selected cases.

Which Cartilage Procedure Is Best?

There is no single best procedure for every cartilage injury.

Treatment selection depends on:

• Defect size
• Defect depth
• Location
• Subchondral bone condition
• Patient age
• Activity level
• Previous cartilage surgery
• Joint alignment
• Meniscus condition
• Ligament stability

Why Is Joint Alignment Important?

A cartilage repair procedure may fail if the repaired area continues to receive excessive mechanical load because of malalignment.

In selected knee patients with varus or valgus alignment, an osteotomy may be considered to redistribute load away from the damaged compartment.

Why Are Ligament Injuries Important?

Joint instability can create repeated abnormal shear forces across a cartilage defect.

For this reason, an ACL or other significant ligament injury may need to be addressed as part of the overall cartilage treatment plan.

Why Is the Meniscus Important?

The menisci help distribute load and protect the cartilage surfaces of the knee.

Significant meniscus loss increases contact pressure and can negatively affect cartilage repair.

Meniscal preservation is therefore important whenever clinically possible.

Can Cartilage Surgery Be Combined With Osteotomy?

Yes.

In selected patients, cartilage restoration may be combined with high tibial osteotomy, distal femoral osteotomy, or another alignment procedure to unload the repaired area.

Can Cartilage Surgery Be Combined With ACL Reconstruction?

Yes.

If instability and cartilage injury are both clinically important, ligament reconstruction and cartilage treatment may be performed during the same treatment period in selected patients.

What Are Patellar Cartilage Injuries?

Cartilage defects can develop on the back of the patella or within the trochlear groove.

They may be associated with patellar instability, dislocation, abnormal tracking, trochlear dysplasia, malalignment, or repetitive overload.

Can Patellar Dislocation Damage Cartilage?

Yes.

During a patellar dislocation, cartilage or an osteochondral fragment can be injured on the patella or lateral femoral condyle.

Large displaced fragments may require fixation or other surgical treatment.

What Are Osteochondral Lesions of the Talus?

Osteochondral lesions of the talus are cartilage and subchondral bone injuries in the ankle.

They can develop after ankle sprains or repetitive loading and may cause persistent ankle pain, swelling, catching, or stiffness.

What Is Osteochondritis Dissecans?

Osteochondritis dissecans is a condition involving a localized area of subchondral bone and the overlying cartilage.

The lesion can remain stable or become unstable and separate from the surrounding joint surface.

Treatment depends on age, skeletal maturity, lesion stability, symptoms, and location.

What Is a Loose Body?

A loose body is a free fragment of cartilage, bone, or both within the joint.

It can move within the joint and cause intermittent catching, locking, swelling, or pain.

Can a Loose Osteochondral Fragment Be Fixed?

Yes, in selected cases.

A sufficiently large, viable fragment with appropriate bone attached may sometimes be repositioned and fixed rather than removed.

The decision depends on fragment size, location, quality, timing, and patient age.

What Is the Difference Between a Focal Cartilage Defect and Osteoarthritis?

Are Cartilage Restoration Procedures Used for Advanced Osteoarthritis?

Usually not as an isolated solution.

Cartilage restoration techniques are generally most suitable for focal defects in joints that otherwise have relatively preserved cartilage.

When degeneration is widespread, treatment may need to focus on osteoarthritis management rather than repairing one isolated area.

What Are the Risks of Cartilage Surgery?

Possible risks include:

• Infection
• Bleeding
• Joint stiffness
• Persistent pain
• Failure of cartilage repair
• Graft problems
• Overgrowth or incomplete integration of repair tissue
• Donor-site symptoms after autograft procedures
• Need for additional surgery

What Is Rehabilitation Like After Cartilage Surgery?

Rehabilitation is an essential part of cartilage repair.

The repaired tissue must be protected while gradually exposing the joint to controlled motion and mechanical load.

Weight-bearing restrictions, range-of-motion exercises, muscle strengthening, and return-to-sport progression vary significantly according to the procedure and lesion location.

Why Is Early Motion Sometimes Encouraged?

Controlled joint motion can support cartilage nutrition, reduce stiffness, and maintain mobility.

However, the amount of movement and load must match the specific repair procedure.

When Can Weight Bearing Begin?

Weight-bearing protocols vary considerably.

Some procedures allow relatively early loading, while others require a period of partial or protected weight bearing to protect the repair.

The defect location and procedure performed are particularly important.

When Can Sports Be Resumed?

Return to sport should be based on healing, strength, joint control, swelling, symptoms, and the biological requirements of the cartilage procedure.

High-impact and pivoting sports generally require a more gradual return than normal daily activities.

Can Cartilage Injury Lead to Osteoarthritis?

A significant cartilage injury can increase the risk of later degenerative joint changes, particularly when associated with instability, malalignment, meniscus deficiency, or subchondral bone damage.

However, progression is not inevitable in every patient.

Can Cartilage Damage Be Prevented?

Not every cartilage injury can be prevented.

Risk may be reduced by maintaining muscle strength, treating joint instability, correcting significant movement problems, managing training load, and appropriately rehabilitating previous injuries.

When Should You See an Orthopedic Specialist?

Evaluation may be appropriate when there is:

• Persistent joint pain after an injury
• Recurrent swelling
• Catching or locking
• Difficulty returning to sports
• Reduced joint movement
• A known cartilage defect on MRI
• An osteochondral lesion
• Persistent symptoms despite rehabilitation

When Is Urgent Evaluation Needed?

Urgent evaluation may be required after significant trauma when the joint is severely swollen, visibly deformed, cannot bear weight, becomes mechanically locked, or when a fracture or displaced osteochondral fragment is suspected.

Cartilage Injury Treatment in Antalya

Treatment of cartilage injuries begins with determining whether the defect is focal or degenerative and evaluating its size, depth, location, subchondral bone condition, joint alignment, stability, and associated meniscus or ligament injuries.

Small or minimally symptomatic cartilage lesions can often be managed with activity modification, rehabilitation, strengthening, and appropriate load management. Surgery is considered when symptoms remain limiting, mechanical fragments are present, or a focal lesion is suitable for restoration.

Depending on the defect, surgical options may include chondroplasty, microfracture, osteochondral autograft transfer, osteochondral allograft transplantation, or cell-based cartilage procedures such as autologous chondrocyte implantation. In selected patients, osteotomy, ligament reconstruction, or meniscus treatment may also be necessary to protect the repaired cartilage.

Frequently Asked Questions About Cartilage Injuries

What is a cartilage injury?

It is damage to the smooth articular surface covering the ends of bones inside a joint.

Can cartilage heal by itself?

Articular cartilage has limited natural healing capacity, particularly when a defect extends through the full thickness of the cartilage.

Does every cartilage injury need surgery?

No. Treatment depends on symptoms, lesion size and depth, location, joint condition, age, and activity level.

Can cartilage injuries be seen on X-ray?

Cartilage is not directly visible on standard X-rays, but X-rays can show joint-space changes, alignment, arthritis, and associated bone abnormalities.

Is MRI useful for cartilage injuries?

Yes. MRI can help evaluate cartilage defects, subchondral bone, osteochondral lesions, menisci, ligaments, and loose bodies.

What is microfracture surgery?

Microfracture is a marrow-stimulation technique in which small openings are created in subchondral bone to encourage formation of repair tissue within a focal cartilage defect.

What is mosaicplasty?

Mosaicplasty transfers several small plugs of the patient's own cartilage and bone into a focal cartilage defect.

What is cartilage transplantation?

Cartilage transplantation may involve osteochondral grafts or cell-based techniques designed to restore selected focal defects.

Can PRP regrow damaged cartilage?

PRP may improve symptoms in selected patients, but it should not be considered a guaranteed method for regenerating normal articular cartilage.

Can cartilage damage cause arthritis later?

Significant cartilage defects can increase the risk of future degeneration, especially when combined with instability, malalignment, or meniscus deficiency.