PCL 7 - Prevalence and Incidence

Prevalence

Osteoarthritis is the most prevalent form of arthritis
Affects more than 70% of adults between 55 and 78 years of age.
One in 2 people will develop osteoarthritis during their lifetime.
Three in 5 people who are obese are at risk for developing knee osteoarthritis during their lifetime.


Women are affected more than men.
Radiographic evidence of OA of the knees is more common in women, whereas OA of the hips is more common in men
The incidence of osteoarthritis among women was consistently higher than among men; for both sexes, incidence increased with age but leveled off around age 80.

Symptomatic and Radiographic Incidence
Few adults aged >55 years have no joint pain, and most have some radiographic evidence of osteoarthritis
The incidence of symptomatic knee osteoarthritis is 1% per year, with a radiographic incidence of 2% per year. The rate of radiographic progression has been estimated at about 4% per year.

Knee Osteoarthritis

In a follow-up to the Beijing study, a strong association was demonstrated between the risk of knee osteoarthritis and squatting — a far more common daily posture in China than in the United States.
Patients who reported squatting >2 hours a day at age 25 were more than twice as likely to demonstrate radiographic osteoarthritis as those who reported squatting 1 hour a day at age 25 was much more common among Chinese women than Chinese men (68% vs. 40%)

Hip Osteoarthritis

In addition, population surveys have shown a lower prevalence for hip osteoarthritis than for knee osteoarthritis.
A Dutch study of 6585 village residents illustrated the sharp age-dependent rise in hip osteoarthritis prevalence, as well as the pattern for increased prevalence among women. Among women, hip osteoarthritis prevalence rose from 2.6% at ages 55 to 59 to 14.8% at ages 75 to 79; the corresponding figures for men were 5.9% and 10.2%, respectively.