Which statement correctly differentiates form closure from force closure?

Which statement correctly differentiates form closure from force closure?

• A. Form closure relies on bones and ligaments, force closure relies on muscles and core strength.
• B. Form closure relies on muscles, force closure relies on bones.
• C. Both rely on bones exclusively.
• D. Both rely on nerves.

Answer: (A)

Form closure is the passive stability provided by the joint’s anatomy—the bone shapes and ligaments that create a snug fit and hold the joint together without active muscle contraction. Force closure, on the other hand, is active stability generated by muscles and soft tissues around the joint; when these muscles contract, they compress the joint surfaces, increasing stability through tension and intra-articular compression. So the statement that form closure relies on bones and ligaments, while force closure relies on muscles and core strength, is the best fit. The other options misplace the source of stability (reversing bones and muscles, or suggesting bones alone or nerves are responsible).

Form closure is the passive stability provided by the joint’s anatomy—the bone shapes and ligaments that create a snug fit and hold the joint together without active muscle contraction. Force closure, on the other hand, is active stability generated by muscles and soft tissues around the joint; when these muscles contract, they compress the joint surfaces, increasing stability through tension and intra-articular compression.

So the statement that form closure relies on bones and ligaments, while force closure relies on muscles and core strength, is the best fit. The other options misplace the source of stability (reversing bones and muscles, or suggesting bones alone or nerves are responsible).