Screwdriver Tool

POSITIONING/ PHASE ONE

• place hand on screwdriver with fingers wrapping around the handle.
• the machine should be high enough so that the elbow is bent(flexed) at about 90 degrees.
• shoulder should be relaxed.
• wrist is slightly turned to the right (supination)

ROTATE RIGHT PHASE

• rotate wrist to the right (supination) slightly so that you are rotating the screwdriver
• elbow should stay flexed
• shoulder should stay relaxed
• Elbow/ Radioulnar Joints:
• Biceps brachii long head, isometrically, in sagittal plane to keep elbow flexed.
• Biceps brachii short head, isometrically, in sagittal plane to keep elbow flexed.
• Brachialis, isometrically, in sagittal plane to keep elbow flexed.
• Brachioradialis, isometrically, in sagittal plane to keep elbow flexed.
• Biceps brachii long head, concentrically, in transverse plane to supinate forearm.
• Biceps brachii short head, concentrically, in transverse plane to supinate forearm.
• Supinator, concentrically, in transverse plane to supinate forearm. 
• Wrist/ Hand Joints:
• Flexor digitorum superficialis, isometrically, in sagittal plane to keep fingers flexed to hold on to screwdriver.
• Flexor digitorum profundus, isometrically, in sagittal plane to keep fingers flexed to hold on to screwdriver.
• Flexor pollicis longus, isometrically, in sagittal plane to keep fingers flexed to hold on to screwdriver.

RELEASE PHASE (ROTATE BACK TO POSITION)

• control rotating your wrist back to original position (pronation).
• elbow should stay flexed.
• shoulder should stay relaxed.
• Elbow/ Radioulnar Joints:
• Pronator teres, eccentrically, in transverse plane to control the pronation forearm.
• Pronator quadratus, eccentrically, in transverse plane to control the pronation forearm.
• Wrist/ Hand Joints:
• Flexor digitorum superficialis, isometrically, in sagittal plane to keep fingers flexed to hold on to screwdriver.
• Flexor digitorum profundus, isometrically, in sagittal plane to keep fingers flexed to hold on to screwdriver.
• Flexor pollicis longus, isometrically, in sagittal plane to keep fingers flexed to hold on to screwdriver.

Drill/ Home Exercise:

The following is a home exercise to help with pronation and supination of the forearm.