Motor Hand Exam (Rock-Paper-Scissors-OK)

Homepage: EMNote.org ■ 🚩Membership: https://tinyurl.com/joinemnote 🚩ACLS Lecture: https://tinyurl.com/emnoteacls Motor Hand Exam: "Rock-Paper-Scissors-OK": A Mnemonic for Assessing Upper Limb Nerve Function The "Rock-Paper-Scissors-OK" mnemonic is a valuable tool used by healthcare professionals to quickly and efficiently assess gross motor function in cases of suspected upper limb nerve injuries. Each hand gesture in this mnemonic represents a specific nerve and its associated motor functions: 1. Rock (Median Nerve): To assess the median nerve, ask the patient to make a tight fist with their thumb tucked inside. This action is controlled by the median nerve, which innervates the muscles responsible for flexion of the fingers and opposition of the thumb. Inability to form a complete fist or difficulty tucking the thumb may indicate median nerve damage. 2. Paper (Radial Nerve): To assess the radial nerve, instruct the patient to extend their wrist and spread their fingers, mimicking the flat "paper" gesture. This action tests the radial nerve, which innervates the muscles responsible for wrist and finger extension. Weakness in wrist extension or difficulty spreading the fingers can suggest radial nerve involvement. 3. Scissors (Ulnar Nerve): To assess the ulnar nerve, ask the patient to spread their index and middle fingers apart, forming a "scissors" shape. This movement is controlled by the ulnar nerve, which innervates the muscles responsible for abduction and adduction of the fingers. Difficulty performing this action or weakness in finger abduction may indicate ulnar nerve damage. 4. "OK-Sign" (Anterior Interosseous Nerve): To test the function of the anterior interosseous nerve, instruct the patient to make the "OK" gesture by touching the tip of their thumb to the tip of their index finger, forming a circle. This action is controlled by the anterior interosseous nerve, which innervates the muscles responsible for flexion of the interphalangeal joints of the thumb and index finger. Difficulty forming the "OK" sign may suggest an issue with the anterior interosseous nerve. Important Note: While the "Rock-Paper-Scissors-OK" mnemonic provides a helpful framework for conducting a quick motor hand exam, it is essential to remember that it is not a definitive diagnostic tool. Healthcare professionals should always consider the patient's history, symptoms, and additional clinical findings to make an accurate diagnosis and formulate an appropriate treatment plan.