Recent med school grad here and plastic surgery resident. Often it's the psychological aspect of a physical deformity that must be treated first before an invasive procedure is even attempted.
The affliction presented here is very rare and many people choose to live with it as surgical intervention is very risky.
The medical terminology for this particular condition is "Horse-cock fingers" because the fingers present themselves in a way that resembles the large cock of a horse.
Often, the first step in psychological treatment is teaching the patient to deal with the medical terminology while also learning to function and even excel with their horse-cock fingers.