### Joint Reaction Force

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not the same as joint forces

"the equal and opposite forces that exist between adjacent bones at a joint caused by the weight and inertial forces of the two segments."

"...a fairly abstract concept useful in mathematical analysis but not much use in practice" (Rodgers & Cavanagh, 1984).

Rodgers, M.M., & Cavanagh, P.R. (1984). Glossary of biomechanical terms, concepts, and units. *Physical Therapy, 64,* 1886-1902.