Final answer:
The most effective method to immobilize a shoulder injury like an anterior dislocation is to use a sling and swath the arm, as it supports the arm and relieves tension on the shoulder joint.
Step-by-step explanation:
The MOST effective method of immobilizing an anterior shoulder dislocation or similar shoulder injuries resulting from a trauma like a collision in a soccer game would be c) Sling and swath the arm. This technique provides stability to the shoulder by supporting the arm in a raised position, thereby relieving tension on the shoulder joint and minimizing further injury. It's not necessary to use a backboard in this situation, as this method is typically reserved for more severe bodily or spinal injuries.
A traction splint is also not suitable here as it is used for fractures of the lower limb, specifically the femur. Swathing the chest and arms alone without a sling may inadequately support the shoulder and could lead to increased discomfort or potential harm.