Figure 1.
Position of the iPhone for the measurement of flexion and extension. (1) Position at end range of flexion. (2) Starting position. (3) Position at end range of extension. The side of the iPhone is aligned with the ear insertion to the head.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.