Free joint bodies are classified according to their composition and origin:

1. Cartilaginous joint bodies:
   • Consist mainly of cartilage tissue, often caused by degenerative diseases such as osteoarthritis.
2. Osseous joint bodies:
   • Contain parts of bone and cartilage, often as a result of injuries or diseases such as osteochondritis dissecans.
3. Synovial joint bodies:
   • Arise from growths of the joint lining (synovium), for example in synovial chondromatosis.
4. Post-traumatic joint bodies:
   • Result from accidents or fractures where bone parts become detached. 

The formation of loose bodies in the joint can be caused by various factors:

- Degenerative diseases:

- In osteoarthritis, there is often abrasion and detachment of cartilage fragments, which are found as loose bodies in the joint space.

- Traumatic injuries:

- Accidents or sports injuries can cause bone or cartilage parts to splinter.

- Inflammatory processes:

- Chronic inflammation of the synovial membrane promotes the formation and detachment of tissue parts.

- Diseases such as osteochondritis dissecans:

- In this condition, small parts of the bone beneath the cartilage die, detach, and become loose bodies.

- Synovial chondromatosis:

- Benign growths of the synovium that can lead to cartilaginous or bony deposits.

The symptoms depend on the size, number, and location of the loose bodies in the joint:

• Pain:
  • Diffuse or localized pain in the affected joint, especially during movement or exertion.
• Joint blockages:
  • Sudden movement restrictions when a loose body gets between the joint surfaces.
• Swelling and effusion formation:
  • Inflammatory reactions due to the movements of the loose bodies in the joint space.
• Grinding or rubbing:
  • Crepitation noises when the loose bodies shift during movement.
• Restriction of mobility:
  • Reduced range of motion due to mechanical obstructions or pain.

The diagnosis of loose joint bodies is made through medical history, clinical examination, and imaging techniques:

• Medical history:
  • The doctor inquires about the duration and nature of the symptoms as well as possible triggers such as injuries or existing joint diseases.
• Clinical examination:
  • Checking for swelling, pain points, and restricted mobility.
• Imaging techniques:
  • X-ray: Visualization of calcified joint bodies and accompanying joint damage.
  • MRI: Visualization of soft tissues and non-calcified joint bodies.
  • CT: Precise visualization of bony structures and the location of the loose joint bodies.
  • Arthroscopy: Minimally invasive method for direct visual assessment of the joint interior.

Conservative Therapy

For small and asymptomatic joint bodies, surgery can be avoided:

• Pain therapy:
  • Use of anti-inflammatory medications like Ibuprofen to alleviate symptoms.
• Physiotherapy:
  • Exercises to maintain joint mobility and strengthen muscles.

Surgical Therapy

In cases of discomfort or recurring joint blockages, removal of the free joint bodies is necessary:

• Arthroscopic removal:
  • Minimally invasive procedure where the joint bodies are removed through small incisions.
• Open surgery:
  • For large or difficult-to-access joint bodies, open surgical removal may be necessary.
• Reconstruction:
  • In severe cases with joint damage, reconstructive measures may be required to restore joint function.

The prevention of loose bodies in joints is limited, as they often arise from unpredictable factors such as injuries. Nevertheless, the following measures can help:

1. Protection of the joints: Avoiding overstrain and using protective gear in sports with a high risk of injury.
2. Regular exercise: Promoting joint health through targeted exercises to strengthen the muscles.
3. Early treatment of joint diseases: Immediate therapy at the first signs of osteoarthritis or inflammatory processes.
4. Avoidance of risk factors: Reducing overweight and adjusting physical activity.