Lewis & Short

ischĭădĭcus, a, um, = ἰσχιαδικός, of or relating to the gout in the hip, ischiadic: dolores, pains in the hip, Plin. 26, 7, 27, § 42: passio, Cael. Aur. Tard. 5, 1, 26.
Subst., one who has the hip-gout, Plin. 25, 13, 106, § 169; 28, 2, 4, § 21; Cael. Aur. Tard. 5, 1, 2 al.