Fig. 4.

Stutter test. Patient positioning: sitting on the side of the bed with knee flex to 90 degrees. The examiner crouches down to knee level placing the index and middle fingers on the center of the patella. Action: the examiner asks the patient to extend the knee slowly while keeping the fingers on the patella and watches its movement. Positive finding: if the patella stutters or jumps during the course of movement, it is indicative of a plica. It is typically in the range of 45 to 70 degrees toward extension. Crepitus of the patella may also be felt.