Osteochondritis dissecans (OCD) is a condition where a small piece of cartilage and the bone underneath it detach from the joint surface. This usually happens because that part of the bone and cartilage doesn’t get enough blood supply. Blood flow provides the necessary nutrients to the bone and joint to help it thrive. Without proper blood flow, the tissue can weaken and separate.

OCD is more common in teenagers and young adults, especially athletes involved in sports that put a lot of stress on their knees. The exact cause isn’t fully understood, but it may involve genetics, mechanical issues, and blood flow problems.

1. Joint Pain: Typically a dull ache that may become sharp during activity. It usually hurts more when you’re active and improves with rest.
2. Stiffness: You may feel tightness in your knee, making it hard to move.
3. Reduced Range of Motion: You might find it difficult to walk, bend, or climb stairs as the condition worsens.
4. Swelling: The knee may puff up.
5. Catching or Locking: Sometimes, the knee can catch or lock up if the loose piece of cartilage gets stuck.

1. Physical Exam: A doctor will check your knee’s range of motion, look for swelling, and feel for pain.
2. Imaging:
   • X-rays: These help to see the joint space and if there is any changes in the bone.
   • MRI: This gives a more detailed view of the OCD lesion and surrounding areas.