Tips on examining patients for parkinsonism: Muscle rigidity

The clinical manifestations of parkinsonism—whether medication-induced or due to Parkinson Disease—often include muscle stiffness. This muscle stiffness can be of two types based on the resistance felt when the examiner bends the patient’s limb (for example, at the wrist):  1. Cogwheel rigidity: feels intermittent or jerky. Once you feel cogwheel rigidity in a patient, you will…