What Is Knee Cartilage Damage?
The cartilage lining your knee joint lets bone glide against bone without friction. Once it wears down or tears, that cushioning disappears, and bone can start grinding against bone, which is eventually what makes knee cartilage surgery a relevant option rather than a first response.
Knee cartilage injury can happen suddenly, from a twisting fall or a hard landing, or build up gradually as knee cartilage wears from years of repetitive load, excess weight, or joint misalignment. The two causes often call for different approaches: a fresh traumatic injury in an otherwise healthy knee behaves differently from degenerative wear layered on top of years of use.
Recognising Cartilage Damage in the Knee
Symptoms tend to build up rather than appear all at once:
Pain worse with activity, or weight-bearing
Swelling or puffiness around the joint area
A grinding, clicking, or catching sensation
Stiffness, particularly after a rest period
A sensation of the knee suddenly giving way
A clinical examination, supported by X-ray or MRI where needed, tells cartilage damage apart from other common causes of knee pain, since the treatment path differs considerably depending on which structure is actually involved.
When Is Knee Cartilage Surgery Recommended?
Not every case of cartilage damage needs surgery. The right path depends on how extensive the damage is, your age, activity level, and how the knee has responded so far.
Non-surgical treatment
Is often the starting point: physiotherapy to strengthen the muscles supporting the joint and improve flexibility, activity modifications to reduce stress on the joint, and in some cases joint injections to manage inflammation and pain. This approach suits milder wear or early-stage cartilage damage where the joint remains reasonably functional.
Knee cartilage surgery
Whether arthroscopic debridement or the microfracture technique, becomes relevant once conservative measures haven’t controlled symptoms and the damage is contained enough to treat directly. Articular cartilage repair specifically targets the smooth surface layer that allows pain-free movement, rather than the meniscus or surrounding structures.
Cartilage regeneration procedures go a step further for more significant defects, aiming to encourage new cartilage growth rather than simply managing the damaged area. These are generally considered for younger, more active patients with well-defined cartilage defects rather than widespread degeneration.
None of these are interchangeable. A joint with early, contained damage responds differently to treatment than one with widespread degenerative wear, and matching the right option to the right presentation is the whole point of a proper assessment rather than jumping straight to the most advanced option available.
What Are the Surgical Approaches for Knee Cartilage Surgery?
Arthroscopic Cartilage Surgery
Arthroscopic knee cartilage surgery uses a camera and small incisions to assess and treat the damaged area directly, smoothing rough cartilage or removing loose fragments that cause pain.
Microfracture Technique
Small holes are drilled in the underlying bone beneath the damaged cartilage, triggering a natural healing response that forms new, if less durable, cartilage-like tissue over the defect.
Cartilage Regeneration Procedures
Autologous chondrocyte implantation or osteochondral grafting move healthy cartilage cells or tissues to the defect, aiming for a more lasting repair than microfracture in selected cases.
Knee Cartilage Replacement
For more extensive or advanced degeneration, knee cartilage replacement procedures may be discussed alongside or instead of repair, depending on how much of the joint surface is affected.
What Happens in Knee Cartilage Surgery?
Before surgery
Surgeon examines the knee for stability, swelling, and tenderness, and typically arranges MRI imaging to map the size, depth, and location of the damage before deciding on the surgical approach.
During surgery
Depending on the extent and location of the damage, the surgeon may:
- Smooth or remove damaged cartilage
- Perform microfracture to stimulate cartilage healing
- Transfer cartilage tissue or cells to the defect
- Assess and address any associated meniscus or ligament injury
Anaesthesia
Knee cartilage surgery is usually carried out under general or regional anaesthesia, with your anaesthesia team confirming the most suitable option beforehand.
After surgery
Weight-bearing restrictions and brace use depend on which procedure was performed. Your surgeon will explain wound care, pain management, and when physiotherapy should begin.
Recovery After Knee Cartilage Surgery
Recovery timelines vary considerably by procedure. Simple debridement typically allows a quicker return to activity than microfracture or regeneration techniques, which need longer for new tissue to mature and bear load safely.
Early rehabilitation focuses on controlled range of motion and protecting the repair, with progressive strengthening introduced as the tissue heals. Rushing this stage risks the repair before it’s had time to settle.
Return to higher-impact activity is guided by how the joint is actually functioning, not a fixed date on the calendar, and should be confirmed by your surgeon and physiotherapist together.
Don’t let cartilage damage progress unmanaged
Who May Be Suitable for Knee Cartilage Surgery?
An orthopaedic assessment determines whether knee cartilage surgery is appropriate and which technique fits your case. This depends on the size and depth of the damage, your age and activity goals, and how you’ve responded to non-surgical care.
Knee cartilage surgery may be considered for:
- A well-defined cartilage defect clearly identified on imaging scans
- Knee pain or swelling despite physiotherapy and activity adjustment
- Mechanical symptoms such as the knee catching, locking, or grinding
- Younger, active patients hoping to resume sport or intense activity
- Cases where cartilage damage is adding to early joint wear and tear
About Your Orthopaedic Specialist
Dr Gowreeson Thevendran
MBChB (Bristol), MRCS.Ed, Dip. Sports Med.Ed, FRCS.Ed (Trauma & Orthopaedics), FAMS (Singapore)
Dr Gowreeson Thevendran is an orthopaedic surgeon in Singapore who specialises in lower limb orthopaedic conditions, including knee cartilage injuries, trauma, and fracture surgery. He undertook fellowship training in sports surgery at Chelsea & Westminster Hospital and in complex trauma and deformity correction at the Royal Liverpool University Hospital, and he continues to serve as a visiting consultant at Tan Tock Seng Hospital.
Questions patients ask
Frequently Asked Questions
What Causes Knee Cartilage Damage?
Causes include trauma from falls or sports, repetitive wear over time, excess weight placing added stress on the joint, and structural misalignment that distributes load unevenly across the knee.
Can Knee Cartilage Repair Itself Without Surgery?
Cartilage has limited capacity to heal on its own due to poor blood supply. Non-surgical treatment can manage symptoms and slow progression, but significant defects generally need knee cartilage surgery to repair properly.
What Is the Difference Between Cartilage Repair and Cartilage Regeneration?
Repair techniques such as microfracture stimulate the body to form new tissue over a defect. Regeneration procedures go further, transferring healthy cartilage cells or tissue to rebuild a more durable surface, typically reserved for larger or more demanding defects.
How Long Does Recovery Take After Knee Cartilage Surgery?
Recovery varies by technique. Simple procedures allow quicker return to activity, while regeneration procedures need several months for new tissue to mature before higher-impact activity resumes.
What Happens If Knee Cartilage Damage Is Left Untreated?
Untreated damage tends to progress, with worsening pain, stiffness, and instability as more of the joint surface is affected, potentially accelerating the path toward osteoarthritis.
What Are the Symptoms of Knee Cartilage Damage?
Common symptoms include pain that worsens with activity or weight-bearing, swelling around the joint, and a grinding, clicking or catching sensation. You may also notice stiffness after rest, or a feeling that the knee is giving way. Symptoms usually build up over time.
How Is Knee Cartilage Damage Diagnosed?
Diagnosis starts with a clinical examination of the knee, checking stability, swelling and tenderness. X-ray or MRI imaging usually follows. MRI helps map the size, depth and location of the damage, and it separates cartilage problems from other common causes of knee pain before a treatment approach is chosen.
What Is Microfracture Surgery for Knee Cartilage?
Microfracture is a keyhole technique where small holes are made in the bone beneath the damaged cartilage. This triggers a natural healing response that forms new cartilage-like tissue over the defect. The new tissue can be less durable than the original cartilage, and your surgeon will advise whether it suits your knee.
Is Knee Cartilage Surgery Right for You?
If your knee feels unstable, painful, or restricted, an orthopaedic assessment can help identify whether knee cartilage surgery is the right next step.