Effects of Exercise Type and Duration on Pain, Function, and Quality of Life in Patients With Knee Osteoarthritis: A Systematic Review With Bayesian Network Meta-Analysis.

In 30 seconds

This systematic review with Bayesian network meta-analysis compared aerobic, resistance, and combined exercise for pain, function, and quality of life in people with knee osteoarthritis. It included 35 randomized trials involving 3,808 patients. Short-term combined aerobic and resistance exercise had the largest estimated effects for pain (SMD = -0.937, low certainty), function (SMD = -0.590, low certainty), and quality of life (SMD = 0.663, low certainty). The authors concluded that exercise interventions improved these outcomes, while evidence for the clinical significance of long-term exercise was limited.

Key findings

• Short-term combined aerobic and resistance exercise had the largest estimated pain effect (SMD = -0.937, low certainty).
• For function, short-term combined exercise had the largest estimate (SMD = -0.590, low certainty); long-term aerobic exercise followed (SMD = -0.540, very low certainty).
• Short-term combined exercise had the largest estimated quality-of-life effect (SMD = 0.663, low certainty).
• The review included 35 randomized trials with 3,808 patients with knee osteoarthritis.

Why it matters

The analysis compares exercise types and timing across outcomes that matter to patients with knee osteoarthritis. Its estimates suggest combined aerobic and resistance exercise may offer broad short-term benefits, but the low or very low certainty ratings mean the apparent ranking should be interpreted cautiously. The limited evidence on long-term clinical significance also leaves uncertainty about sustained benefits.

What to keep in mind

Certainty was low for the largest short-term combined-exercise estimates and very low for the long-term aerobic function estimate; the authors also noted limited evidence on the clinical significance of long-term interventions.