### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
Have started having a burning sensation behind my right knee in the past two weeks: no physical signs. I do one hour of Zumba dance exercise 6 days/week; 58 years old, weight, blood pressure, etc. all good. No prescription drugs.. Am very healthy! Today, some numbness has started on the outside of that calf; doesn t really stop me from going/doing/exercising but is annoying .. Have noticed that my tail bone is uncomfortably sore in certain sitting positions, recently, but don t recall anything that would account for that... Help?! Thx.

### output:

Hithank you for providing the brief history of you. A thorough neuromuscular assessment is advised. Based on your history, due to performing of the Zumba, the mechanism of the injury has to be understood, Due to performing Zumba for long hours, there will be a possibility of the injury of the soft tissues in the knee as well as the lumbar spine. As, your age is 58, you may have degenerative changes in the joints and soft tissues. So, stopping Zumba for a week will be advised. Also, performing the thorough euro muscle skeletal assessment by an or tho, the weakness in the muscles can be determined, if required the or tho may ask for an MRI of either the knee or the lumbar spine as you have burning sensation behind the knee. The burning sensation in the knee or behind can be due to ligament injury, which needs a thorough assessment. Also, you have numbness in the calf muscle and discomfort in the tail bone, this can be the lumbar spine pathology for which the symptoms are arising. I will recommend undergoing a clinical orthopedic musculoskeletal assessment and an MRI of knee and spine to help you further. Physical therapy will be recommended by your or tho and Zumba will be stopped as well. Recovery with physical therapy will help you regain the normalcy in 2-3 weeks since you are an active person. RegardsJay In Chat Doctor. 