In reply to John Mcshea:
When the tendon is loaded it will try to find the shortest distance between point a where the force is applied i.e your finger tip and point b where the tendon attaches to your elbow on the lateral or medial epicondyle (sharp bony bits on inside and outside of elbow). If unattached it would bow out.
When a bit of gristle is damaged tape can support the damaged area and prevent the tendon bowing out. this tends to happen at the finger joints but if the wrist is flexed at 90 degs the i guess the tendon may want to bow out if the flexor retinaculum (sheath/gristle bit that holds it next to the wrist are damaged).
Drop a grade and tape or take time off. its raining anyway. dawes apparently climbed masters edge with one hand or one leg or something.
good luck
