Simple bone cysts treated with aspiration and a single bone marrow injection. A preliminary report.

The results of a single percutaneous aspiration and injection of marrow into active, simple bone cysts are reported in 8 cases. Slow regression of the cyst was consistently observed except in one lesion in the distal tibia. All the patients have been free of symptoms after this treatment after a mean follow up of 31 months. The evolution of the cysts was monitored by a cyst index, cyst diameter measurements and computer assisted densitometric image analysis of serial radiographs.