PRESTON SIGN is noted when the knees are flexed with the patient lying supine.

A chiropractor performing the Derefield test.

During the Derefield test, done on almost every patient by many Chiropractors, it may be observed from time to time that when the knees are flexed, one of the hips rises dramatically from the table. I have named this after a colleague and good friend!, the Preston Sign.

Of the true significance of this sign I remain unsure, but I find that the PS is often associated with an Arthritic Hip or the Femero-Acetabular-Impingement-Syndrome.

  • Read more about Hip arthritis and Chiropractic ...
  • Read more FAIS.

    For the researcher

    1. In 100 consequtive patients, how often is the PS found?

    2. In 100 patients with a positive PS, how many have loss of flexion, or adduction, or extention, or internal or external range of motion, as measured with the hip flexed.

    3. How many have loss of internal or external rotation when lying in the anatomical position.

    4. How does a positive PS affect the Derefield test?


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