Exercise and knee osteoarthritis: benefit or hazard?

Area of Science:

• Orthopedics
• Sports Medicine
• Rheumatology

Background:

• Knee osteoarthritis (OA) is a leading cause of disability in older adults.
• Patients often worry that exercise may worsen knee symptoms.
• Understanding the role of physical activity in OA is crucial for patient management.

Purpose of the Study:

• To evaluate the impact of physical exercise on the development and progression of knee osteoarthritis.
• To determine if exercise is beneficial or detrimental for individuals with knee OA.

Main Methods:

• Comprehensive literature search of multiple databases (MEDLINE, EMBASE, DARE, Cochrane) up to January 2009.
• Inclusion of studies on individuals with and without pre-existing knee OA.
• Analysis of evidence levels, including Level I and Level II studies.

Main Results:

• No evidence suggests exercise accelerates knee OA development when injury is avoided.
• Exercise demonstrates significant benefits in reducing pain and disability for individuals with knee OA.
• Various exercise modalities (aerobic, strengthening, aquatic, physiotherapy) improve physical functioning.

Conclusions:

• Moderate exercise does not accelerate knee OA progression, even with pre-existing disease, if trauma is prevented.
• Exercise consistently improves physical function and reduces pain and disability in individuals with knee OA.
• Exercise interventions are likely underutilized in managing established knee OA symptoms.