MYH8 and Trismus - pseudocamptodactyly: MYH8 (MyHC-neo) mutations are responsible for another form of distal arthrogryposis (DA7), referred to as the trismus-pseudocamptodactyly syndrome (TPS) because the patients cannot open the mouth fully (trismus) and show an unusual camptodactyly (flexion of the fingers) that is evident only on dorsiflexion of the wrist (i.e., pseudocamptodactyly).