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Sach (solid ankle, cushioned heel)

- Discussion:
    - has been standard for decades, and is still appropriate for general use, however, the multiaxis foot and energy storing foot are becoming 
         more popular;
    - w/ BKA prosthesis if Sach foot heel cushion is too soft knee will be hyperextending during stance phase;
    - AKA prosthesis which has its Sach foot attached too far posterior on the shin, will cause the knee to buckle at heel strike