Osteochondritis dissecans is non infective condition in which a portion of articular cartilage and underlying bone is slowly separated from its bed. The etiology remains unclear, the clinical presentation can be vague and the natural history is poorly understood. The integrity of the articular surface and the stability of the lesion can be carefully evaluated with MRI and arthroscopy. Stable lesions identified early have the best prognosis with conservative management. Indications for surgery include persistent or worsening symptoms despite prolonged conservative care, loose bodies, or evidence of instability.Surgical intervention is either by open method or via arthroscopy.