Weather: clear, no rain. Miner was walking on the walkway between kilns 1/2 & 3/4 and was going up 3 steps and pulled self up with the handrail & felt something pull. EE didn't think anything was wrong but as EE said the pain progressed. So, EE went to the doctor and was diagnosed as a sprained tendon or tear. Has not missed any days for EE's shift.