To evaluate clinical diagnosis, treatment and results of the intraarticular ganglion of the knee joint.

From April 1996 to May 1999, nine patients were taken arthroscopic excision of the intraarticular ganglion. Diagnosis was based on history, thorough physical examination and MRI and confirmed by biopsy.

As seen in the internal derangement of the knee, symptoms of the intraarticular ganglion were varied from asymptom to pain, effusion and limitation of motion. After arthroscopic excision, eight of nine patients were improved satisfactorily.

The diagnostic rate of the intraarticular ganglion in the knee would be increased after the introduction of MRI and the results would be improved using arthroscopy. In the case of chronic nonspecific knee pain and limitation of motion, the possibility of the intraarticular ganglion might be considered.