Foot and Ankle Arthrodesis or Osteotomy With Io-Fix Type Fixation

The recovery of foot and ankle arthrodesis and osteotomy is still plagued by the problem of delayed consolidation or even pseudo-arthrosis. To date, the foot and ankle unit of UZ Leuven is using a state of the art system, called the Io-Fix system, to optimize the biomechanical stability. However, the current literature lacks studies assessing and quantifying the advantages of the Io-Fix system. Objective presentations about the use of, and (early) results are currently missing. Therefore, the investigators want to take their responsibility to objectively investigate whether they can confirm and quantify the expected positive results of using the Io-Fix system. Subsequently, the investigators want to search for eventual unexpected problems with Io-Fix.

Inclusion Criteria: * Being routinely scheduled for a reconstructive surgical procedure for the following indications or involving the following type of procedure 1. Any reconstructive procedure for Pes Planus, Pes Plano-valgus, or Posterior Tibial Tendon Dysfunction 2. Tibio-talar arthrodesis or prosthesis 3. Sub-talar -and/or (partial) Chopart - and/or Triple arthrodesis 4. Pantalar arthrodesis with or without inclusion of the Chopart joint Exclusion Criteria: * Age under 18