knee-joint
Definition
- Noun:
- Anatomical structure: "knee-joint" refers to the joint that connects the thigh bone (femur) to the shin bone (tibia) in the leg, allowing for bending and straightening.
- Engineering component: In mechanical contexts, a "knee-joint" denotes a type of hinge or pivot joint, such as a toggle joint, used in machinery to transmit force at an angle.
Usage Examples
Anatomy:
- The knee-joint is one of the largest and most complex joints in the human body. (It connects the upper and lower leg bones.)
- He injured his knee-joint while playing football. (He damaged the joint in his leg.)
Engineering:
- The machine uses a knee-joint mechanism to apply pressure. (It employs a joint that bends like a knee.)
Advanced Usage
"knee-joint reflex": An automatic reaction where tapping the tendon below the kneecap causes the leg to kick, testing nerve function.
- The doctor tested the patient's knee-joint reflex with a small hammer. (The reflex involves the knee joint.)
"knee-joint replacement": A surgical procedure to replace a damaged knee joint with an artificial one.
- After years of arthritis, she underwent knee-joint replacement surgery. (Her natural joint was replaced.)
Variants and Related Words
- Knee (n): the joint itself, often used synonymously with "knee-joint" in casual speech.
- He fell and scraped his knee. (He injured the area around the knee joint.)
- Kneecap (n): the small bone (patella) that protects the front of the knee-joint.
- She broke her kneecap in the accident. (The bone over the knee joint.)
Synonyms
- Stifle joint: The knee-joint in animals, especially horses.
- Genu: A technical term for the knee or knee-joint in anatomy (from Latin).
Related Idioms
- "A knee-jerk reaction": An automatic, unthinking response (not literally about the joint, but derived from the knee reflex).
- His decision was a knee-jerk reaction to the criticism. (He responded without careful thought.)