For the elderly, falls are a major hidden danger to health. Data show that among community-dwelling elderly aged 65 and above, about 28% experience at least one fall every year, and the risk of falls increases exponentially with age. Falls not only cause direct trauma such as fractures and abrasions but also may lead to the loss of independent living ability, reduced quality of life, and even increased risk of death in the elderly.
Many people are not aware that the increased risk of falls in the elderly is closely related to the degradation of proprioception. Proprioception is our ability to perceive joint position and movement. It can continuously transmit signals to the brain through receptors in muscles, tendons, and ligaments, helping us adjust body posture in a timely manner to avoid imbalance. However, with the increase of age, the proprioception of the knee joint will deteriorate significantly—the accuracy of knee joint position perception in the elderly is even less than half of that in young people. Worse still, many elderly people also suffer from knee osteoarthritis, and the degeneration of joint tissues will further interfere with this sensory feedback, making balance control more difficult.
To improve knee joint stability and enhance sensory feedback, many elderly people wear knee braces. But in addition to acting on the knee joint, will braces have an impact on other parts of the body? For example, the pressure distribution between the sole of the foot and the ground when we stand, which is a key indicator reflecting the body's posture control ability. A recent study on the elderly explored this easily overlooked issue.
The study recruited 13 community-dwelling elderly with an average age of nearly 80 years old. They were asked to stand barefoot on a professional plantar pressure testing platform for 10 seconds in three situations: without a brace, wearing Brace A, and wearing Brace B. The core of the test was to observe the impact of different braces on indicators such as plantar contact area, pressure magnitude, and force distribution.
The findings of the test are very interesting: the impact of braces on plantar pressure is not only related to the type of brace but also shows obvious laterality. Specifically, the two types of braces only had a significant impact on the left foot force of the elderly, but almost no effect on the right foot.
Compared with the state without a brace, when wearing Brace A, the total contact area and rearfoot contact area of the elderly's left foot both increased; while when wearing Brace B, these two values decreased instead. However, regardless of the type of brace, it did not change the plantar pressure intensity or the force distribution ratio between the left and right feet. These key indicators remained stable under the three test conditions.
Although this result seems minor, it hides a small secret of body posture adjustment. Changes in plantar contact area essentially reflect changes in the elderly's posture control strategy when standing. Through slight compression and support of the knee joint, the brace stimulates the receptors around the joint, which in turn indirectly affects the contact mode between the foot and the ground. But this impact is not uniform—different designed braces will guide the body to make different posture adjustments, and this adjustment only occurs on one foot.
Why does the situation of "left foot affected, right foot unchanged" occur? Researchers speculate that this may be related to the dominant side of the elderly's limbs. Each person's left and right feet do not play exactly the same role in supporting the body and maintaining balance. This innate difference may make the impact of the brace more inclined to one side of the limb. However, this is only a speculation and needs more research to verify.
It should be noted that the sample size of this study is small, and only the static state of quiet standing was tested, without involving dynamic scenarios such as walking, turning, and going up and down stairs, which are more prone to falls. Therefore, we cannot directly conclude which type of brace is more conducive to preventing falls in the elderly.
But this study gives us an important enlightenment: when choosing knee braces for the elderly, we should not only focus on the supporting effect of the brace on the knee joint but also pay attention to its impact on the overall body posture. Different designed braces may bring completely different changes in plantar force, and the connection between this change and the risk of falls is worthy of our further exploration.
In the future, with the in-depth research, we may be able to customize exclusive brace schemes according to the individual conditions of the elderly—such as whether they have knee osteoarthritis, which side is the dominant limb, and what are the characteristics of plantar force. At that time, knee braces can not only protect the knee joint but also become an "invisible helper" for the elderly to prevent falls, making their later life safer and more quality.
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