Of the other large joints, all of which may be involved in tuberculous processes similar to those just discussed, it may be said that they come under the general rules of treatment already laid down.
NON-CARIOUS DEFORMITIES.
TORTICOLLIS; WRYNECK.
This term includes a peculiar postural deformity by which the head is rotated and inclined abnormally to one side in a more or less fixed position. As to the causes of the deformity two will be considered:
Congenital causes include:
1. Injury to the sternomastoid muscle at birth, which is perhaps the commonest.
2. Abnormal intra-uterine position and pressure.
3. Arrest of muscular development.
4. Intra-uterine myositis, the muscles being sometimes found actually altered in structure.
5. Defective development of the upper vertebrae or such distorted growth as is often met along with other deformities, e. g., club-foot.