Final answer:
Torticollis is the correct answer as it is the condition where the cervical spine is rotated due to the shortening of the sternocleidomastoid muscle.
Step-by-step explanation:
Torticollis is the condition in which neck motion is limited, and the cervical spine is rotated because of shortening of the sternocleidomastoid muscle. While other spinal deformities like scoliosis involve an abnormal lateral bending of the vertebral column, and kyphosis is an excessive curvature of the upper thoracic vertebral column, these conditions do not specifically involve the sternocleidomastoid muscle or a rotated cervical spine. Lordosis describes an excessive curvature in the lumbar region of the vertebral column and also does not meet the description of the question. Furthermore, cervical dystonia, which is also called spasmodic torticollis, involves involuntary contraction of the neck muscles, causing the head to twist to one side.