It is effective mainly when those muscles have already partially flexed at the elbow. When sitting with the knees flexed it acts as an abductor. The elbow could not be flexed past a right angle to the humerus. Fingers cannot be fully flexed if the wrist is fully flexed. Brachialis is the main muscle used when the elbow is flexed slowly. The xyston was used to thrust either overarm or underarm with the elbow flexed. Children with the amyoplasia type of arthrogryposis usually have flexed and ulnarly deviated wrists. PVC cards can crack or break if bent/flexed excessively. The wings were flexed approximately upward during the test. It is most easily palpated (felt) with the knee partially flexed. The knee is flexed at 15 degrees with the patient supine. Prior to 2017, women did flexed arm hangs instead of pull-ups. LU flexed its muscles with the forced dissolution of the parliament in 1912. They simply opened up and parted as the hull flexed or broke beneath them. The hand could not be fully flexed for a grasping motion or spread for raking.