Abnormal 5th finger morphology Passive dorsiflexion of the 5th finger more than 90 degrees 2017-09-24T00:56:23Z An abnormally increased ability to bend (dorsiflex) one's fifth finger. To assess this feature, the examiner requests to proband to extend the elbows,to bend the wrist back so that it forms a ninety degree angle to the forearm, and to extend the fingers. Then, the proband is requested to bend the fifth finger back as far as is possible without discomfort. If the angle of the fifth finger exceeds 90 degrees, this is considered to be abnormal. This feature is tested on the right and left side and if positive, each feature contributes one point to the Beighton score.