Week 3: Knee Statistics

Question 1

Knee osteoarthritis – worldwide prevalence (& prevalence for >40yrs) %

Answer 1

Worldwide prevalence = 16%
>40 years = 22%

Question 2

Prepatellar bursitis % of non-traumatic knee pain causes

Answer 2

15%

Question 3

ITB syndrome (runners knee) % of non-traumatic knee pain causes

Answer 3

15%

Question 4

Bakers cyst % of non-traumatic knee pain causes

Answer 4

3%

Question 5

Patellofemoral pain syndrome % of non-traumatic knee pain causes

Answer 5

22%

Question 6

What percentage of ACL injuries are accompanied by medial meniscus injury?

Answer 6

60–75 % of cases of anterior cruciate ligament injury are accompanied by medial meniscus injury

Question 7

Cruciate ligament injury % of all knee pain

Answer 7

4% (higher in athletes)

Question 8

Meniscus injury % of all knee pain

Answer 8

3-8%

Question 9

The prognosis for patients with knee osteoarthritis and patellofemoral pain is not so favorable. What % of patients will develop chronic symptoms?

What are the variables related to a poorer prognosis in patients with knee OA

Answer 9

~50%

Variables that may be related to a poorer prognosis in patients with knee osteoarthritis are:
* higher age and female sex,
* varus position of the knee,
* other joints with arthritis, and
* excess body weight (poor lifestyle habits)