Osteochondritis
Osteochondritis is a lack of blood supply to the cartilage and underlying bone of a joint. As a result, pain and reduced range of motion occur.
Symptoms and causes
Osteochondritis, also known as osteochondritis dissecans, is an inflammatory disease affecting the cartilage and the subchondral bone of a joint. It is a pathology that causes pain and limits range of motion.
Although it is most common in the knee, it can also affect other joints. Depending on the location, osteochondritis can present in different forms:
- Knee osteochondritis: causes damage to a segment of hyaline cartilage and subchondral bone (the bone beneath the cartilage tissue in the joint). It most frequently affects the medial femoral condyle, the inner portion of the femoral base.
- Chest osteochondritis: refers to costal or sternocostal osteochondritis. It affects the costal cartilages, which connect the ribs to the sternum. There are two types:
- Costochondritis: cartilage damage is present, but inflammation is mild and not visible.
- Tietze syndrome: a more aggressive inflammation of the cartilage, with swelling visible to the naked eye.
- Hip osteochondritis: known as Legg-Calvé-Perthes disease, affecting the femoral head in children aged 4 to 10 years. This is more severe than the previous types, as impaired blood supply leads to necrosis of bone and cartilage tissue.
- Talus osteochondritis: occurs in the ankle bone that connects the leg to the foot.
The prognosis for osteochondritis is generally favorable in young patients, as it often resolves with rest. However, older patients have a higher risk of osteoarthritis. Early diagnosis is crucial to prevent complications.
Symptoms
The most characteristic symptoms of osteochondritis include:
- Pain that progressively increases, often manifesting during joint movement or on palpation.
- Redness of the affected area.
- Swelling, which is not always visibly apparent.
- Limited range of motion.
- Sensation of joint instability.
- Occasionally, edema (fluid accumulation within the joint).
Osteochondritis is classified into different grades according to severity, and pain varies depending on the type:
- Stable osteochondritis: the bone and cartilage remain in place.
- Grade I: the cartilage is softened but still attached to the bone, which may show compression or a minor stress fracture. Pain is typically present only during physical activity.
- Grade II: the joint structure is damaged as a fragment of bone begins to separate from the base. Pain is more constant, with stabbing sensations on pressure.
- Unstable osteochondritis: the bone and cartilage separate from the underlying bone and become loose within the joint.
- Grade III: the bone attached to cartilage has fully separated but remains in its original location. Pain is constant and worsens with movement.
- Grade IV: the fragment completely detaches from its bed and moves freely within the joint. Pain intensifies, and the joint may lock during movement attempts.
Causes
The primary cause of osteochondritis is impaired blood flow to the affected bone. This deficiency can result from several factors:
- Trauma.
- Repetitive or high-impact movements.
- Joint overuse, such as insufficient recovery time between sports activities or overweight.
- Rapid bone growth exceeding connective tissue development, causing excessive joint stress.
- Nutritional deficiencies: lack of vitamins and minerals affects bone and cartilage development.
Risk Factors
The risk of osteochondritis increases under the following conditions:
- Age: most common between 10 and 20 years, especially in highly active individuals.
- High-impact exercise.
- Jobs requiring repetitive joint use.
- Frequent sports injuries.
- Genetic predisposition.
- Metabolic disorders, such as diabetes or gout.
H2: Complications
The most common complication of osteochondritis is osteoarthritis, a degenerative disease that wears down the cartilage covering the joint's bone surfaces.
Prevention
The best preventive measures for osteochondritis include:
- Using proper technique in sports activities.
- Warming up before and stretching after exercise.
- Performing exercises to strengthen muscles and improve flexibility.
- Using protective equipment during work or sports.
- Avoiding muscular overload.
- Maintaining an appropriate body weight.
- Allowing recovery time after intense exertion.
- Leading a healthy lifestyle.
Which Specialist Treats Osteochondritis?
Osteochondritis is managed by specialists Traumatology and Orthopedic surgery.
Diagnosis
Osteochondritis diagnosis involves several tests, including:
- Medical history: collecting information about the patient’s medical and family history, lifestyle, and presenting symptoms.
- Physical examination: inspecting the joint for swelling or deformities and palpating for hidden edema, tenderness, and pain points. Range of motion is usually assessed.
- X-ray: uses radiography to visualize the joint, detect bone abnormalities, decreased bone density, or loose fragments.
- Computed tomography (CT): X-rays are taken from multiple angles to generate a three-dimensional representation of the joint structures. This allows detailed observation of bones and easier localization of loose fragments.
- Magnetic resonance imaging (MRI): employs radio waves and a magnetic field to visualize both bone and soft tissues (cartilage and tendons). Useful for detecting cartilage lesions or edema and assessing fragment viability. Essential for selecting the optimal treatment.
Treatment
Osteochondritis can be managed with conservative or surgical approaches depending on severity. Common interventions include:
- Rest: avoiding activities that stress the joint. Immobilization devices may be used if necessary.
- Medication: anti-inflammatory drugs reduce swelling, while analgesics relieve pain.
- Biological therapy: intra-articular injection of substances to reduce pain, decrease inflammation, and promote regeneration of bone and cartilage tissue. The most effective include:
- Platelet-rich plasma (PRP): a concentrate derived from the patient’s own blood with a high platelet concentration.
- Stem cells: harvested from bone marrow or adipose tissue and injected into the affected area.
- Physiotherapy: manual therapy and targeted exercises to strengthen muscles and improve joint mobility are part of rehabilitation.
- Surgery: indicated only in grade III and IV cases to reattach or remove fragments, or if conservative treatment fails. Procedures include:
- Arthroscopy: small incisions (0.5–1 cm) allow insertion of a flexible probe with a camera and surgical instruments.
- Fixation: screws (often resorbable) stabilize detached fragments to avoid a second intervention.
- Mosaicplasty or grafting: severe cases may require cartilage or bone transplantation.
