Internal anti-proratory plug assembly and process of installing the same

A process of correcting pes plano valgus comprising the steps of preparing a prosthesis by producing a unitary biocompatible plastic plug having a major base, a minor base and a tapered conical sidewall, tapering from said major base to said minor base and securing flexible lines to said plug so that the lines extend from said minor base, exposing the sinus tarsus of a persons's foot, inserting the lines and said plug, minor base first into the subtalar opening between the talus and calcaneous bones of said foot so that said plug is disposed within the sinus tarsus of said foot, continuing the insertion of said lines through said subtalar so that said lines pass above the posterior tendon and thence around opposite portions of the deltoid ligament, adjacent to said sinus tarsus and thereafter tying the end portions of said lines together, sufficiently close to said deltoid ligament that the lines restrain said plug within said sinus tarsus and prevent said plug from being forced outwardly therefrom, said plug being sufficiently large that it does not pass through the sinus tarsus but is wedged therein.