Dr., I am 45yo, F, negative medical history, avid tennis player ... 4 weeks ago opened jar with right hand/also tennis hand ...felt/heard snap on right hand knuckle second finger. Knuckle is red,warm,not swollen,pain 3/10 when opening and closing hand. Play tennis 3-4x weekly. Cannot figure out if torn tendon? Or something else...please advise. Thank you.