Osteoarthritis (OA) is the most common joint disorder. It is due to aging and wear and tear on a joint.
Hypertrophic osteoarthritis; Osteoarthrosis; Degenerative joint disease; DJD; OA; Arthritis - osteoarthritis
Cartilage is the firm, rubbery tissue that cushions your bones at the joints. It allows bones to glide over one another. When the cartilage breaks down and wears away, the bones rub together. This often causes the pain, swelling, and stiffness of OA.
As OA worsens, bony spurs or extra bone may form around the joint. The ligaments and muscles around the joint may become weaker and stiffer.
Before age 55, OA occurs equally in men and women. After age 55, it is more common in women.
Other factors can also lead to OA.
- OA tends to run in families.
- Being overweight increases the risk for OA in the hip, knee, ankle, and foot joints. This is because extra weight causes more wear and tear.
- Fractures or other joint injuries can lead to OA later in life. This includes injuries to the cartilage and ligaments in your joints.
- Jobs that involve kneeling or squatting for more than an hour a day, or involve lifting, climbing stairs, or walking increase the risk for OA.
- Playing sports that involve direct impact on the joint (football), twisting (basketball or soccer), or throwing also increase the risk for OA.
Medical conditions that can lead to OA include: