Ligament reconstruction of the finger or thumb is a surgical procedure designed to repair or restore function to a damaged ligament in the finger or thumb. Ligaments are fibrous tissues that connect bones to other bones and provide stability to the joints. When a ligament in the finger or thumb is torn or injured, it can lead to pain, instability, and difficulty with movement. This type of surgery is typically used for severe ligament injuries, such as those caused by trauma or repetitive stress, that do not heal with conservative treatments.