The Claim
During load carriage, the ankle joint contributes 45–60% of stride-time positive mechanical work during push-off, the knee joint contributes significantly to positive mechanical work during rebound, and the hip joint primarily increases negative mechanical work near the end of stance.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
When carrying a load while walking, the ankle joint produces 45–60% of the forward-propelling energy during push-off, the knee joint contributes substantial energy during the rebound phase, and the hip joint absorbs more energy than it produces near the end of the stance phase.
See the scientific wording
During load carriage, the ankle and knee joints contribute the majority of increased positive mechanical work, with the ankle accounting for 45–60% of stride-time push-off work and the knee contributing significantly during rebound, while the hip primarily increases negative work near the end of stance.
When carrying extra weight, the body's center of mass becomes harder to move and stop. To push forward during walking, the ankle and knee muscles must generate more force to redirect this heavier mass, doing more positive work. The ankle does most of this pushing off, while the knee helps bounce the body back up. At the end of each step, the hip muscles must pull harder to slow the leg down, doing more negative work to control motion.
What the research says
1 studyStudy: Mechanics and energetics of load carriage during human walking
When people walk with a heavy backpack, their ankles and knees work harder to push off and bounce back, while the hip works more to slow the leg down — and this study measured exactly that.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.