Actually I mean tight wrist, not grip, but they go hand in hand, right? How can you do one without the other? Maybe I should have included swinging with a tight wrist. But I assumed that if you swing with a tight wrist, then you also make contact with a tight wrist.
There are ways of making tennis elbow worse without actually hitting the ball, such as a takeback without the help of your non-hitting hand. Or not a complete follow through. But I don't think these would cause TE if your wrist is loose in these processes either. So bottom line, I think it is having a tight wrist/grip. Is this better?
I'm not being pedantic but there are many other activities that can cause tennis elbow that don't fall under the reason you gave - suggesting it's not as simple as you are making out. From the nhs website:
"Activities that can cause tennis elbow
The tendons in your elbow can be injured by overuse of the forearm muscles in repeated actions such as:
using scissors, or shears,
gardening,
sports that involve lots of throwing,
swimming,
manual work that involves repetitive turning, or lifting of the wrist, such as plumbing, or bricklaying,
typing, and
racquet sports. "
In my experience (with golfers elbow) the physios I have consulted - some of whom work on the WTA tour and a physio for the male seniors tour all state it can be caused by:
- Poor shoulder flexibility
- Poor posture with shoulders
- Pec and bicep tightness
- Muscle imbalance between bicep / tricep and between forearm muscles
- Hyperextension of elbow during contact phase (more common with females)
My point being is that there can be a whole myriad of reasons and as such oversimplifications are very misleading.