Could your own skin cells make a prosthetic limb fit better?

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion criteria: 1. Ages 18 to 75, inclusive 2. Must have a transtibial amputation 3. Must be using a prosthesis within the vicinity of 3 months or have had osteo-integration of a prosthetic in place for 1 month 4. In the opinion of the investigator, must be medically able to undergo the administration of study material determined by laboratory tests obtained up to 14 days before baseline for which the investigator identified no clinically significant abnormality. 5. Able to provide written informed consent 6. Females of childbearing potential must: have a negative pregnancy test at screening agree to not become pregnant or breastfeed for the period of the study through 1 month after completion of the study be willing to use a reliable form of contraception during the study. 7. Has healthy skin on the residual limb and is free of severe and active skin disease (excluding those on the residual limb) such as extreme and active eczema or psoriasis, active non-healing wounds, lichen planus, a history of keloid scare formation or lupus as determined by the investigator or study nurse. 8. Willing and able to comply with the scheduled visits, biopsy/injection procedures, wound care instructions treatment plan, and other study procedures for the duration of the study. Exclusion criteria: 1. A skin erosion deeper than the skin dermis. 2. Ulcers exceeding 4cm in diameter or 2cm in radius 3. Non circular ulcers that cannot tolerate a 1cm margin at all sides 4. Having received any investigational drug within 30 days prior to study entry 5. An allergy history to any study materials including local anesthetic, dimethyl sulfoxide, human albumin, or bovine constituents, hetastarch, or EMLA (lidocaine 2.5% and prilocaine 2.5%). 6. Pregnant, lactating, or trying to become pregnant 7. A history of keloid formation 8. Having a significant medical history that the investigator feels is not safe for study participation (for example, some forms of autoimmune conditions, metastatic cancer, infectious diseases such as HIV, HTLV I/II, Hepatitis B, Hepatitis C). 9. Autoimmune diseases affecting the skin such as lupus. 10. Presence of necrotic ischemic tissue on any stump ulcers, and/or capillary refill on stump skin of greater than 3 seconds 11. Active infection of the residual limb (e.g. osteomyelitis, wound or skin condition with surrounding swelling, erythema, drainage, pain, gangrenous tissue or fever). 12. Active smoker during the study (this includes e cigarettes and any type of tobacco use) 13. We will also exclude those who are on chronic immunosuppressive therapies such as oral steroids, but also those on chronic topical steroids in the area of investigation. 14. Amputees with symptomatic neuromas of the terminal limb within the last 3 months. 15. Known bleeding disorder. 16. Have a history of congenital or idiopathic methemoglobinemia, glucose-6-phosphate deficiencies, or use of medications associated with drug-induced methemoglobinemia. (specifically: Sulfonamides, Acetaminophen, Acetanilid, Aniline dyes, Benzocaine, Chloroquine, Dapsone, Naphthalene, Nitrates and Nitrites, Nitrofurantoin, Nitroglycerin, Nitroprusside, Pamaquine, Paraaminosalicylic acid, Phenacetin, Phenobarbital, Phenytoin, Primaquine, or Quinine.) 17. Quadriplegics