About Our Program

The Denver Clinic for Extremities at Risk Osteonecrosis Program is a made up of a multidisciplinary team of physicians who can provide surgical options for treatment based on the stage of disease and a person's lifestyle.  With options to total joint replacement, a person with avascular necrosis (osteonecrosis) may be able to delay the need for a joint replacement surgery and the revisions necessary throughout their life. 



Case Studies

Vascularized Fibular for AVN of the Femoral Head





A 43 year old man presented to the Avascular Necrosis program at The Denver Clinic for Extremities at Risk with right hip pain that increases with physical activity.  He had no history that put him at risk for osteonecrosis but MRI revealed a Ficat Stage II lesion of his femoral head.   


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Osteonecrosis of the Knee in Teenage Girl






This young woman presented to the osteonecrosis program at The Denver Clinic with severe knee pain. She had a previous history of osteochondritis dissecans and previous episodes of knee pain that eventually resolved with prolonged rest.  When she presented to the osteonecrosis program her knee pain had not resolved with rest, as it had before. Her MRI showed an area of osteonecrosis on her femoral condyle.  

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meet the team

Conrad Tirre, MD
tirre_nov07Dr. Conrad Tirre is one of 3 plastic surgeons with the osteonecrosis program.  He is fellowship trained in microvascular procedures for treatment of osteonecrosis.