Reference values for range of motion and muscle function of the neck in infants.

Purpose: To determine reference values for cervical range of motion (ROM) in rotation and lateral flexion and for muscle function in the lateral neck flexors in a sample of infants who were healthy.

Method: ROM was measured, and muscle function was estimated in 38 infants at the ages of 2, 4, 6, and 10 months.

Results: For rotation the mean ROM was 110 degrees and for lateral flexion it was 70 degrees.