My arm pain disappeared completely after using the Ki5. At first I did have the pain but an injured arm needs time to heal. I used many racquets in my quest to solve my arm problems. I used a Becker London for a while and it was good as well. However no racquet was quite like the PK Ki5. My problems were from the shoulder to the triceps and biceps. The other measures I took were the following:
2. Ice after every session to bring down inflammation.
3. I used a compression sleeve briefly with some success.
4. Multi strings.
5. I was pronating heavily on my serve. I went from a eastern BH grip to a continental.
6. Look at how you are sleeping, I was sleeping with my arm twisted under my pillow and head. So basically my arm was in an awkward position for 8 hours with poor circulation. Sleeping differently has I believe had the greatest impact in my recovery.