Evaluate the Continued Safety and Performance of the Foot and Ankle Products

Inclusion criteria

• Subject requires surgery using Arthrex foot and ankle products included in the registry.
• Subject is 18 years of age or over (all products except ProStop®).
• Subject age \>two to 17 years (ProStop® product only).
• Capable of completing self-administered questionnaires.
• Willing and able to return for all study-related follow-up visits.
• Subject or subject's representative signed informed consent and assent, when applicable, and is willing and able to comply with all study requirements. (ArthroFLEX® subjects only):
• Degenerative or post-traumatic arthritis of the 1st MTP joint with grade 2, 3, or 4.
• Subjects who require surgical intervention or are medically indicated for an arthrodesis or arthroplasty of the 1st MTP. DualCompression Hindfoot Nail subjects only:
• The participant must have instability, arthritis, rigid deformity, or severe foot or ankle deformity necessitating tibiotalocalcaneal arthrodesis, commonly referred to as TTC arthrodesis.
• The participant should be undergoing treatment with the Arthrex DualCompression Hindfoot Nail, either as a primary procedure or as a revision surgery, per standard of care

Exclusion criteria

• Insufficient quantity or quality of bone.
• Blood supply limitations and previous infections, which may retard healing.
• Foreign-body sensitivity.
• Any active infection or blood supply limitations.
• Conditions that tend to limit the patient's ability or willingness to restrict activities or follow directions during the healing period.
• Subjects that are skeletally immature (except for ProStop®).
• Subject is considered from vulnerable population (i.e., child, prisoner, pregnant).
• Subjects who are contraindicated for these devices.
• Subject is currently receiving compensation or benefits due to a work-related injury or illness under any applicable occupational injury or disability program.
• Subject has a planned or scheduled additional surgery on the affected or contralateral lower extremity within the course of the study. (® Nitinol Staple Subjects only):
• Subjects who have a comminuted bone surface that would not allow for staple placement as required by the DynaNite® Nitinol Staples directions for use.
• Subjects who have pathologic bone conditions such as osteopenia that would impair the ability to securely fix the implant as required by the DynaNite® Nitinol Staples directions for use. (ArthroFLEX® subjects only):
• Additional ipsilateral lower limb pathology that requires active treatment.
• Bilateral degenerative or post-traumatic arthritis of the 1st MTP joints that would require simultaneous treatment of both MTP joints.
• Diagnosis of gout.
• Any significant bone loss, avascular necrosis, and/or large osteochondral cyst (\>1cm) of the 1st MTP joint.
• Lesions greater than 10mm in size.
• Hallux varus to any degree, or hallux valgus \>20 degrees. (DualCompression Hindfoot Nail subjects only):
• Requiring only a tibiotalar or subtalar arthrodesis
• Patient requires bulk allograft or metal spacer implant to fill large bony defect and aid in limb salvage