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

### input:
Hi, played tennis two weeks ago and felt soreness in my kneecap a couple oif days after that. Almost like the knee wanted to lockup. Then I ve had my calf muscle very sore to the touch. Used ice and took aleve. Seemed to help but still very sore. I ve plated tennis for over 39 years and always stretch before playing. Never been injured playing in all that time.

### output:

Hi. Thank you for reaching out to Chat Doctor. Common causes of knee pain include the following - Muscle injurySoft tissue straining really issue popliteal muscle straight fact that you mention that the knee is locking up may indicate a popliteal muscle issue. This is because the muscle causes the knee to lock after extension of the muscle. One of the best regimens to promote healing of this is usually by using the POLICE regimen. POLICE stands for -Protection - Protect the joint. Prevent injury and avoid excessive exercise. Optimal loading - This is when the muscle is loaded to the right strain and right tension. In this tension, the muscle would heal quicker because the muscle can contract and relax allowing blood to flow smoothlyIcing the area for 15 mins at a time can be very useful for allowing healing and to reduce swellingCompression - Using a knee sleeve for some part of the day may helpElevation of the leg while lying down or sleeping can help with recovery by pushing blood back to the heart. Along with this, many people find using OTC NSAIDs useful to reduce the swelling. Also, using a hot compress may help as well. I hope this helps. Please reach out to me if you have any other questions.  Chat Doctor. 