Explain the "trick movements" a patient with a ruptured supraspinatus tendon might use when raising their arm and why.

When a patient has this injury and tries to raise their arm above their head on the affected side, they often use "trick-devices" to compensate:

1. They might tilt their body to the affected side, which causes the arm to swing away from the body, achieving an initial 15° of abduction.
2. Alternatively, they might use their healthy hand to slightly lift the affected arm by about 15°.

These maneuvers help them bypass the painful or impossible initial abduction phase normally performed by the supraspinatus, allowing other muscles to take over for further arm movement.