This knee xray is of a 64 year old man who had a 6-month history of pain in his leg. He had increased pain when he put weight on his leg and did acknowledge that the pain was worse at night. He was referred for evaluation and management. 

On examination he had discomfort with palpation of the area just below his knee, and mild swelling in this area as well. He didn't have any recent injury to the area.  He didn't have any other medical problems that he was aware of.  

Because of the abnormal appearance of his xray there was a suspicion of a cancerous or an infection process.  He was sent for an MRI and blood tests.

	Intra-operative imaging showing the surgeon removing the section of the tibia with the chondrosarcoma.
	Tumor specimen after removal. This is sent to pathology for analysis.
	Reconstruction of the affected area using a distal femoral replacement and allograft tibia.
	Intra-operative imaging showing the gastrocnemius muscle flap placed into the area of resection. This provides coverage to the front of the lower leg just below the knee.