This definition appears rarely
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Samples in periodicals archive:
Learn how to perform the flexion rotation exercise to help treat your low back pain.
Compression, traction, and subluxation/ dislocation of the ulnar nerve at the cubital tunnel during prolonged elbow flexion or repetitive elbow flexion and extension...
Flexion and extension describe movements that affect the angle between two parts of the body. These terms come from the Latin words with the same meaning.