Impact of Active Ankle Movement Frequency on Velocity of Lower Limb Venous Flow following Total Hip Arthroplasty

Figure 1

Protocol for active ankle movement at three frequencies and measurement of blood flow velocity at the profunda femoris. After one minute of active ankle movement, the velocity of venous blood flow was measured three times (black arrows indicate the point of measurement: (1) just after movement, (2) 1 minute after movement, and (3) 2 minutes after movement). The order of the three different frequencies (40, 60, and 80 contractions per minute) was determined by drawing lots. Four minutes after the first frequency of ankle movement, another frequency of active ankle movement was performed, and similar measurements were repeated.