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When load is applied to the hand (F) with a specific moment ( L), the fixed fulcrum (E) is the DRUJ. Stability is defined as equality in forces, with their specific moments, working on a fixed fulcrum. If the elbow is stable, the load between elbow and DRUJ (F’ x L’) will equal the load between the DRUJ and the hand (F x L) in a stable situation.
