Extensor Digitorum Communis (EDC )Testing and Dynamic Splinting

In this video I answer a question from one of my students, we discuss some techniques for EDC Testing and Dynamic splinting options.
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The Extensor Digitorum Communis (EDC) is a muscle located in the forearm that is responsible for extending the fingers and wrist. Testing the EDC is often performed to assess its strength and function. Here are some principles to consider when testing the EDC:

Patient Position: The patient should be seated comfortably with the forearm resting on a table or supported by the examiner. The elbow should be flexed at approximately 90 degrees, and the wrist should be in a neutral position.

Muscle Isolation: To specifically test the EDC, it's important to isolate its action. This can be achieved by asking the patient to keep the other fingers extended while testing each finger individually.

Manual Muscle Testing: Manual muscle testing is commonly used to evaluate muscle strength. The examiner applies resistance against the patient's attempt to extend the finger while maintaining a stable position. The patient should be instructed to extend the finger against resistance as strongly as possible.

Grading: Grading muscle strength provides an objective assessment of muscle function. The commonly used grading scale is as follows:

Grade 5: Full strength, normal movement against resistance.
Grade 4: Good strength, reduced movement against resistance.
Grade 3: Fair strength, full range of movement against gravity only (no resistance).
Grade 2: Poor strength, movement with gravity eliminated (passive movement).
Grade 1: Trace contraction, no joint movement.
Grade 0: No contraction, no muscle activity.
Comparative Testing: It's important to compare the strength of the EDC on both sides of the body for a more accurate assessment. The uninjured or unaffected hand can be used as a reference point for comparison.

Sensory Examination: Along with strength testing, it is often important to evaluate sensory function associated with the EDC. Sensory testing can include assessing for any loss of sensation or abnormal sensations in the distribution of the affected nerve.

Diagnostic Tools: In some cases, additional diagnostic tools may be used to assess the EDC, such as electromyography (EMG) or nerve conduction studies (NCS). These tests can provide more detailed information about nerve conduction and muscle activity.

It's worth noting that these principles are general guidelines, and specific testing methods may vary depending on the clinical context and the preferences of the healthcare professional conducting the examination.

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