Obesity and knee osteoarthritis

Area of Science:

• Orthopedics
• Rheumatology
• Epidemiology

Background:

• Obesity is a well-documented risk factor for knee osteoarthritis (OA).
• Previous meta-analyses confirm that overweight and obesity increase knee OA risk, with pooled odds ratio of 2.63 for obesity.
• The effect size for obesity as a risk factor for knee OA is substantial (I² = 97%).

Purpose of the Study:

• To review recent findings on the association between knee osteoarthritis and obesity.
• To explore potential mechanisms linking obesity and knee OA.
• To summarize the benefits of weight loss for obese patients with knee OA.

Main Methods:

• Literature search using MEDLINE, EMBASE, PUBMED, Cochrane, CINAHL, and reference lists.
• Inclusion of recent prospective and case-control studies.
• Analysis of population-based studies with long-term follow-up.

Main Results:

• Recent studies confirm obesity as a primary risk factor for incident knee OA.
• Prospective studies show 7-fold increased risk for knee OA in individuals with BMI ≥ 30.
• Odds ratios for knee OA in obese individuals range from 2.81 to 7.48 across studies.

Conclusions:

• Obesity is a significant risk factor for developing knee osteoarthritis.
• The link between obesity and knee OA involves both biomechanical and metabolic factors.
• Weight loss offers clinical benefits for obese knee OA patients, including pain reduction and improved function.