Hi, thanks for writing to HCM.
* If you are not able to move your distal phalanx (finger tip bone) even slightly, then there is a possibility of complete tendon injury
* If you could move it a little bit, then it may be due to partial tendon rupture or due to the oedema of the joint restricting the movement.
A partial rupture of the tendon may heal spontaneously if it is properly immobilized. Whereas a complete rupture needs a surgical repair.
Hope this information is helpful. Good day