in orthopedics, a deformity caused by an abnormal rotation of a portion of an extremity with relation to the long axis of the entire extremity.
tor·sion·al de·for·mi·ty
(tōr'shŭn-ăl dĕ-fōrm'i-tē) orthopedics A deformity caused by rotation of a portion of an extremity with relationship to the long axis of the entire extremity.