One of the best articles I have found until now. It is the use of Nickel Titanium which is a metal alloy with a spring reaction that returns to its origina shape, In other words, if you bend a sheet of this metal, it bounces back and does not deform. This article gives me hope, because it discusses the use of this metal in an ankle orthosis. However, to achieve the results, actions were measured to provide a certain outcome. The more and more I think the best orthotic solution for my case would me a Nickel Titanium foot plate with an extension of the big toe. However the thickness of that sheet would need to be determined in order to bring the spring effect as close to the original toe as possible. Application of the Superelastic NiTi Spring in Ankle Foot Orthosis (AFO) to Create Normal Ankle Joint Behavior

Also an interesting article that refers that Nitinol (Nickel Titanium) is still not that commonly used in orthotics. Nitinol for Prosthetic and Orthotic Applications

A scientific article involving the loss  of the Hallux. In this case with diabetic patients.

Acral Melanoma has a higher tendency to recur than non acral melanoma Acral Melanoma: A Patient’s Experience and Physician’s Commentary

Orthotics for partial foot amputation Follow this link

The loss of the big toe causes changes in gait and this article covers this topic: “Gait Abnormality Following Amputation in Diabetic Patients”

As precaution, surgeons amputate the toe rather than just removing the tumour itself: In Response to “Descriptive Survival Study of Nail Melanoma Patients Treated With Functional Surgery vs Distal Amputation”

My brother is a dentist and fits implants and I always wondered if there was some type of toe implant that could be attached to where the toe was. I found this abstract about ceramic implants, but the study seems to treat patients who have the full toe and not amputees. Worth a read nevertheless Press-fit ceramic implant arthroplasty of the hallux metatarsophalangeal joint—Evaluation of outcomes

Does First Ray Amputation in Diabetic Patients Influence Gait and Quality of Life?