Can a tfcc injury lead to arthritis? how?

Potentially: There is a term known as post traumatic arthritis that can occur with an injury. The cartilage is the cushion in the joint that acts as somewhat of a shock absorber. In degenerative arthritis, it can simply be worn down over time. In post traumatic arthritis. It can be injured and lose its ability to protect the joint from damage.

Yes: The TFCC is a ligament complex that creates stability between the radius, the ulna and the first row of the carpus. The damage to this structure and therefore lack of stability eventually cause abnormal movement in the carpus and make you prone to early OA of the radio-carpal joint.