What Is Cartilage Damage in the Knee and Its Treatment?

Knee cartilage damage refers to wear, tear, or injury in the smooth cartilage tissue that cushions the bones inside your knee joint. To treat this condition, our orthopedic specialist, Dr. Charles Ruotolo, first recommends non-surgical treatment. These treatment options include rest, ice therapy, anti-inflammatory medications, activity modification, and targeted exercises.

However, if knee pain persists despite conservative treatment, he may recommend surgical procedures such as chondroplasty or microfracture. In severe cases, he may also advise partial or total knee replacement, especially with advanced osteoarthritis or extensive cartilage loss. Contact us now to consult Dr. Charles Ruotolo at Total Orthopedics and Sports Medicine in Commack.

What Are Common Signs of Knee Cartilage Damage?

Knee cartilage damage often causes dull, localized pain under the kneecap, joint stiffness, and recurrent swelling. In fact, according to a study published in the Osteoarthritis Research Society International Journal, nearly 70% of patients experienced knee pain, while 58% reported swelling associated with cartilage damage. The study also found that 42% of patients developed crepitus, a grinding or popping sound, whereas 29% experienced noticeable knee stiffness.

In addition, 15% of patients experienced reduced range of motion, affecting bending or straightening of the knee. Similarly, 9% of patients developed warmth or redness around the knee joint due to inflammation. Here are some other symptoms of damaged cartilage cells:

• Temporary knee locking during movement, especially if there is a loose cartilage fragment
• A feeling that the knee may give way during walking, turning, or climbing stairs
• Pain that worsens after high-impact activities, such as running, jumping, or sports
• Weakness while standing from a seated position or putting weight on the affected knee
• Reduced athletic performance or inability to pivot comfortably
• Muscle weakness or shrinking around the thigh due to reduced movement
• Limping because knee pain or weakness can make it difficult to put full weight on the leg

What Causes Cartilage Damage in the Knee Joint?

Traumatic injuries, progressive wear and tear, and joint misalignment can cause cartilage damage in the knee joint. Similarly, overuse of the knee, excessive body weight, and repetitive stress from physically demanding work can also damage cartilage cells. In addition, the following conditions can increase the risk of knee cartilage injuries:

Meniscus Tear

When the meniscus cartilage loses its ability to absorb shock properly, force spreads unevenly across the joint. Over time, this imbalance can injure the underlying bone and surrounding articular cartilage. In fact, a PubMed study reported that more than 75% of patients with symptomatic arthritis already had meniscus injuries.

Aging

As you age, cartilage cells lose their ability to repair damaged tissue effectively. In addition, the blood supply around the joint cannot nourish cartilage effectively, which slows natural healing. Therefore, older patients often develop gradual cartilage wear.

Ligament Instability

Ligament instability alters the mechanics between the thigh bone and shin bone. Instead of gliding smoothly, the bones may shift or rotate abnormally during walking, pivoting, or climbing stairs. In such cases, the cartilage surface experiences repeated mechanical stress, which can worsen cartilage damage.

Weak Muscles

The quadriceps help control the movement of the kneecap and reduce pressure on the knee joint. However, when these muscles weaken, the kneecap may get misaligned and irritate the cartilage behind it. For example, a study published in the Orthopedic Journal of Sports Medicine found that patients with knee cartilage damage had 14.5% to 19% weaker quadriceps muscles in the injured leg compared with the healthy leg.

Poorly Managed Inflammation

If you have joint inflammation, the chemicals released in the knee can gradually damage healthy cartilage. This inflammation also makes the joint lining more sensitive, causing knee swelling after normal activity. Over time, repeated swelling can limit movement, increase stiffness, and speed up cartilage loss.

Do Sports Injuries Contribute to Cartilage Wear?

Yes, sports injuries can contribute to cartilage wear. Traumatic injuries such as ACL tears, meniscus damage, or joint dislocations can alter the knee joint’s biomechanics. They can also disrupt the smooth gliding motion of the knee joint during sports activities. As a result, the cartilage surface experiences significant pressure and friction during movement. Over time, this repeated stress can speed up cartilage damage and worsen knee pain.

In addition, sports injuries can contribute to cartilage wear through the following mechanisms:

• Direct impact: A forceful fall or collision can cause acute microfractures to the underlying bone and tear the cartilage surface.
• Joint inflammation: An acute injury can trigger inflammation inside the knee, which may release enzymes that weaken the cartilage.
• Repeated return-to-play stress: Returning to sport too early can strain healing cartilage before the joint regains strength and control.
• Loose cartilage fragments: Small broken cartilage pieces can move inside the joint and irritate the cartilage surface during bending or straightening.
• Muscle imbalance: Weak quadriceps or hip muscles after injury can change knee loading patterns and increase cartilage stress during movement.
• Repetitive twisting movements: Sports that involve pivoting and sudden direction changes can repeatedly irritate already-damaged cartilage.

Can Cartilage Damage Lead to Osteoarthritis?

Yes, cartilage damage is one of the leading causes of osteoarthritis. When the knee’s protective cartilage gets injured, it cannot absorb shock or lubricate the joint properly. As a result, the joint experiences extensive stress during daily activity. At the same time, ongoing inflammation inside the knee can cause cartilage deterioration faster than the body can repair it. Over time, the cartilage slowly degenerates, which leads to painful bone-on-bone friction within the joint.

To reduce this risk, our experienced knee surgeon, Dr. Charles Ruotolo, first identifies the cause of the cartilage degeneration. He assesses your knee for unstable ligaments, meniscus damage, poor alignment, or loose cartilage fragments. Then, he treats those issues to reduce ongoing stress on the remaining cartilage and minimize the risk of progressive osteoarthritis.

How Do Doctors Diagnose Cartilage Damage?

To diagnose cartilage damage, Dr. Charles Ruotolo conducts a physical examination, reviews imaging scans, and performs arthroscopy if needed. During the physical exam, he assesses your joint function, knee stability, tenderness, swelling, and range of motion. He may also perform bending, straightening, rotating, or weight-bearing tests to identify pain, catching, locking, or limited movement.

If the physical examination indicates cartilage damage, Dr. Charles Ruotolo may order an MRI scan to confirm the diagnosis. Since MRI creates detailed cross-sectional images of soft tissues, it allows him to visualize the exact size, location, and severity of cartilage damage. In some cases, he may also review X-ray scans, especially if he suspects bone fractures, arthritic changes, or joint space narrowing. However, if imaging does not clearly confirm the diagnosis, our surgeon may perform knee arthroscopy. During this minimally invasive procedure, a thin tube with a tiny camera is inserted through small incisions. This allows him to view the real-time condition of the cartilage inside the knee joint.

Can Stem Cell Therapy Support Cartilage Healing?

Yes, stem cell therapy can support the healing of knee cartilage. During this procedure, surgeons collect mesenchymal stem cells, usually from bone marrow concentrate, fat tissue, or umbilical cord blood. Then, they process these cells in a laboratory and inject them into your knee joint. After injection, these cells release growth factors that promote tissue repair and decrease joint inflammation.

In fact, a study published in PubMed Central found that stem cell therapy can significantly reduce pain and improve joint function. Additionally, magnetic resonance imaging (MRI) revealed improvements in cartilage volume and structure after stem cell therapy, indicating new cartilage formation. Similarly, this treatment may also delay the need for knee surgery in some patients.

However, not everyone can safely receive stem cell therapy. This treatment may cause the following side effects in severe cases:

• Allergic reactions
• Bacterial infections
• Nerve damage
• Blood clots

Therefore, you should consult our orthopedic specialists before getting stem cell injections. We assess your cartilage damage, medical history, infection risk, and previous treatments to determine if this treatment is suitable for your condition. In addition, our team helps you understand insurance coverage, referrals, and co-pays before treatment. If you do not have insurance, we offer self-pay pricing and flexible payment options to help you receive expert treatment without financial burdens. Call 855-321-6784 now to book your appointment.

How Can PRP Therapy Help With Knee Cartilage Injury?

PRP therapy releases healthy growth factors that support cartilage cell activity and tissue repair within the knee joint. It may also reduce inflammation by calming irritated joint tissues. As inflammation decreases, you can perform targeted strengthening and mobility exercises with less pain, which supports faster recovery. In many cases, symptom improvement with PRP may last up to 12 months.

Which Surgical Procedures Work Best for Knee Cartilage Restoration?

To restore knee cartilage, Dr. Charles Ruotolo may recommend matrix-induced autologous chondrocyte implantation (MACI), osteochondral allograft transplantation (OCA), or knee replacement. He may also advise arthroscopic knee surgeries, such as osteochondral autograft transfer (OATS or mosaicplasty), microfracture, or chondroplasty.

Our surgeon chooses the most appropriate surgical technique based on the severity, size, and location of cartilage damage. He also reviews your age, activity level, meniscus health, ligament stability, and overall joint condition before recommending surgery. Here’s how different surgical procedures can help restore cartilage health:

Matrix-Induced Autologous Chondrocyte Implantation (MACI)

In MACI, surgeons first remove a small sample of healthy cartilage tissue from your knee. Then, these cartilage cells are grown in a laboratory and placed onto a special collagen membrane. During surgery, the surgeon secures this membrane over the cartilage defect, which helps regenerate smoother cartilage tissue. This procedure is often recommended for younger patients with healthy surrounding knee structures.

Osteochondral Allograft Transplantation (OCA)

OCA is recommended for extensive osteochondral defects, failed prior cartilage surgery, or significant underlying bone damage. During this procedure, the surgeon removes the damaged cartilage and bone from the knee joint. Then, they place a healthy cartilage and bone graft from a donor to restore the joint surface.

Knee Replacement

If irreversible, advanced joint degeneration impacts your daily life, surgeons may recommend knee replacement. During this procedure, they remove the damaged cartilage surface along with small portions of the underlying bone from the knee joint. Then, they position specially shaped metal components over the ends of the thigh bone and shin bone. A durable medical-grade plastic spacer is placed between these implants to reduce painful bone-on-bone contact.

Here are two major types of knee replacement procedures:

• Partial knee replacement repairs one damaged compartment while preserving the remaining healthy bone, cartilage, and ligaments.
• Total knee replacement reconstructs the entire knee joint when severe cartilage wear affects multiple compartments.

Osteochondral Autograft Transfer (OATS or Mosaicplasty)

Osteochondral autograft transfer (OATS or mosaicplasty) is similar to osteochondral allograft transplantation. However, instead of using donor tissue, the surgeon removes healthy cartilage and bone grafts from a non-weight-bearing area of your own knee. Then, they transfer these grafts into the damaged cartilage defect to restore a smoother joint surface. Because the graft is taken from your own knee, OATS reduces the risk of tissue rejection.

Microfracture

If you have minor cartilage damage, surgeons may consider microfracture. In this procedure, the surgeon removes loose or damaged cartilage and creates small holes in the underlying bone. These tiny openings release bone marrow cells and stem cells into the cartilage defect. As a result, the knee forms new repair tissue over the damaged area.

Chondroplasty

Surgeons often recommend chondroplasty for rough or damaged cartilage surfaces. This procedure focuses on trimming and removing small, loose cartilage fragments inside the knee joint. Once loose cartilage fragments are removed, friction inside the joint decreases, which supports better knee movement and reduces irritation during activity.

How Long Does Knee Cartilage Recovery Take?

Knee cartilage damage can heal in 6 weeks to 18 months, depending on injury severity and treatment type. For example, minor articular cartilage injuries may improve within 6 to 8 weeks with rest, targeted exercises, and activity modification. However, surgical treatments require a longer recovery due to limited blood supply and rehabilitation requirements.

Here’s an average recovery timeline for different surgical procedures:

• Arthroscopic surgery: 2 to 3 months
• Microfracture: 4 to 6 months
• Meniscus repair: 3 to 6 months
• Cartilage restoration: 6 to 12 months
• Autologous chondrocyte implantation: 9 to 18 months
• Partial or total knee replacement: up to 1 year

During recovery, you must closely follow all post-operative instructions from your surgeon. They will guide you through progressive exercises, movement restrictions, and a gradual return to activity. In addition, you can review our arthroscopy post-op guide, created by our experienced knee surgeons. This guide includes pain management strategies, wound care instructions, and strengthening exercise routines.

Which Lifestyle Changes Can Help Protect Knee Cartilage?

To protect knee cartilage, you should switch to low-impact exercises like swimming and engage in targeted strength training focused on your quadriceps, hamstrings, glutes, and core. These muscles help support proper patellar tracking and reduce stress across the knee joint. You should also maintain a healthy body weight, as a 1 kg weight can put 4 kg pressure on your knees with every step.

Here are some other active lifestyle changes that may help protect your knee cartilage:

• Avoid repetitive high-impact activities like jumping on hard surfaces
• Stretch your hamstrings, calves, and hip muscles regularly to improve knee flexibility
• Wear supportive footwear because poor shock absorption during walking can increase pressure on the knee joint
• Avoid smoking because reduced blood circulation can interfere with cartilage repair and joint healing
• Follow an anti-inflammatory diet rich in vegetables, fruits, lean protein, and omega-3 fatty acids to support joint health.
• Use proper lifting techniques because twisting the knee under heavy load can increase cartilage stress.
• Manage blood sugar levels properly, as chronic metabolic inflammation may speed up cartilage degeneration.
• Improve sleep quality because insufficient rest can worsen stiffness, soreness, and joint discomfort.

Book an Appointment with Dr. Charles Ruotolo for Knee Cartilage Treatment in Commack!

Knee cartilage damage may initially cause mild pain, stiffness, or occasional swelling. However, if left untreated, it can gradually alter the mechanics of the knee joint. Over time, these changes may contribute to secondary orthopedic problems, including meniscus tears or ligament strains.

At Total Orthopedics and Sports Medicine, Dr. Charles Ruotolo, our Castle Connolly Top Doctor, uses advanced diagnostics, physical examination, and imaging to determine the exact cause of the cartilage damage. Based on these diagnostic findings, he develops targeted treatment plans including conservative or surgical care. Along with expert treatment, he also guides you through injury-prevention techniques to support long-term knee function. Contact us or visit 500 Commack Road, Building E, Suite 150B, to consult Dr. Charles Ruotolo.

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