Weight-Bearing Joint
A joint that supports body weight during standing and movement, such as the knees, hips, ankles, and spine. These joints are most affected by osteoarthritis due to cumulative stress.
Extended Definition
Weight-bearing joints carry and transmit the body’s weight during daily activities. They experience compressive forces with every step, making them particularly susceptible to wear-and-tear arthritis.
Primary Weight-Bearing Joints
- Hips - Bear full body weight
- Knees - Bear up to 4x body weight when climbing stairs
- Ankles - Transfer weight between leg and foot
- Spine - Supports upper body weight
Why OA Affects These Joints Most
- Constant stress - Every step loads these joints
- Cumulative damage - Years of use add up
- Body weight multiplier - Forces exceed body weight during activities
- Difficult to rest - Walking is essential for daily life
Force Multipliers
| Activity | Knee Force (x body weight) |
|---|---|
| Standing | 1x |
| Walking | 2-3x |
| Climbing stairs | 4-5x |
| Squatting | 7-8x |
| Running | 8-10x |
Impact of Body Weight
Every pound of body weight = 3-4 pounds of force on knees. This is why weight management is crucial for joint health.
Treatment Considerations
HA injections are particularly well-studied for weight-bearing joints, especially knees. The lubricating effect helps reduce friction during the constant motion these joints undergo.
Related Terms
More Conditions Terms
View allBilateral Arthritis
Arthritis affecting the same joint on both sides of the body, such as both knees or both hips. Common in osteoarthritis due to similar wear patterns.
Bone Spur
A smooth, bony growth that develops along the edges of bones, especially in joints affected by osteoarthritis. Also called an osteophyte.
Bone-on-Bone
A colloquial term describing advanced osteoarthritis where cartilage has worn away completely, allowing direct contact between bone surfaces. Often painful and may require surgery.
Chondromalacia
Softening and deterioration of cartilage, most commonly affecting the underside of the kneecap. Often considered an early stage of patellofemoral arthritis.
Crepitus
A crackling, popping, or grinding sensation or sound that occurs during joint movement, often felt or heard when bones with damaged cartilage rub together.