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. 2022 Aug 27;15:2547–2556. doi: 10.2147/JPR.S369470

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© 2022 Bernhoff et al.

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Drawings from study participants. To the left (1–3) are examples where C2 involvement was assessed to be present. To the right (5–6) are drawings with examples of a negative outcome. (1) Criterion A is met (upper neck) and 3 of criteria B (pain involving back of head, both jaws and left temple). (2) Criterion A is met and 1 of criteria B: back of head. (3) Criterion A is met and 2 of criteria B: ear and jaw. (4) Criterion A is met, not B. (5) Criterion A is met, not B. (6) Neither A or B is met (homogenous shading, ie, no pain punctum maximum in C2 supplied areas).