An aunt came to the clinic, she was six weeks after knee surgery, outpatient review, there is a very strange thing. According to the aunt herself: "After the operation, the knee pain is much better than before, mainly before the operation, my ankle hurts, sometimes I can't walk, after the operation, I didn't hurt once, why is this?" "
I believe that many people have such a question: Obviously doing knee surgery, how can the ankle problem be cured? In fact, the answer is very simple: knee surgery has restored the patient's lower limb line of force.
First, what is the lower limb force line?
The lower limb force line is the center of the femoral head, the center of the knee and the center of the ankle joint, which is called the hip one knee and one ankle angle. Among them, the center of the femoral head adopts the center of the femoral head, the center of the knee joint adopts the midpoint of the apex of the intercondylar fossa of the femur, and the center of the ankle joint adopts the midpoint of the talus.
Second, what is the impact of abnormal lower limb line of force?
The normality of lower limb force lines directly affects the load conduction of the hip, knee and ankle joints. The normal lower limb weight-bearing axis is the hip, knee, and ankle three-point line, which can ensure the reasonable distribution of the force load, and the three joints can bear the weight within their own capabilities. Abnormal changes in the axis can lead to uneven weight bearing in the hip, knee and ankle joints, resulting in wear and tear of cartilage, joint damage, and painful symptoms. For a specific situation, we can look at the following figure:
Lower extremity line in normal state and knee varus and valgus
The reason why the patient mentioned at the beginning of the article had foot and neck pain before the operation was because the knee joint lesion caused the lower limb line to change, and her ankle underwent more weight, resulting in uneven force of the ankle joint and the symptoms of pain, that is, the "ankle pain" in the patient's mouth. After the operation, the stability and function of the patient's knee joint returned to normal, the affected lower limb force line was also corrected, and the ankle joint no longer had to bear the "burden", and it was naturally not painful.
3. What conditions will cause changes in lower limb line of force?
1. Joint lesions
Let's take knee arthritis as an example, knee arthritis will cause the gap between the patient's tibia and femur (that is, the calf bone and thigh bone) to narrow, and this narrowing is irregular, which will affect the patient's lower limb line, the specific degree of impact We can see the following figure:
Study results: The comparison of lower limb force line measurements and normal reference values of Chinese people in 50 patients with knee osteoarthritis is shown in Table 1. The A-angle values of male and female patients with osteoarthritis of the knee joint measured were both smaller than the normal reference values of Chinese people, and the difference was statistically significant (P
2 Obesity
Most people know that obesity is closely related to high blood pressure, diabetes, coronary heart disease, etc. But its relationship with joint health, especially the health of weight-bearing joints, is something that most people don't realize.
Obesity leads to increased knee load, long-term abnormal load to destroy the joint cartilage, resulting in subchondral fractures, joint cartilage collapse, resulting in cartilage malnutrition, cartilage peeling further increases the pressure on the medial side. Such a vicious circle leads to aggravation of knee varus deformity.
To put it simply: obesity affects the lower limb line of force, and the change of the lower limb force line will further increase the weight borne by the joint, resulting in a vicious circle.
How do you know if you're obese? It can be judged by the simple obesity index BMI, calculated by: body mass index (BMI) = weight (kg) divided by the square of height (m).
Fourth, do not patronize the knee arthritis, ankle joint damage will also affect the knee joint
Ankle sprains are the most common sports injuries, and serious ankle sprains can gradually develop into chronic ankle instability (CAI) if not treated and treated in a timely and effective manner.
This results in limited joint mobility, abnormal balance and postural control, and recurrent ankle sprains as the main clinical manifestations. Cai has a greater impact on athletic performance and daily activities than on acute ankle sprains.
The 2016 International Association Consensus Statement noted that while the cost of direct treatment for ankle sprains is relatively low, the indirect medical expenses are high. In addition to considering the time-consuming costs associated with injuries, medical expenses related to ankle injuries amount to a billion dollars each year. Because chronic ankle sprains are one of the important causes of injury to other structures of the lower extremities (such as anterior cruciate ligament, fibular muscle, peroneal support band, etc.).
The last thing to tell you is that our body is a whole, different parts, tissues are mutually influential, in addition to avoiding headaches, foot pain in addition to the foot, but also pay attention to a part of the problem, must be dealt with in time, otherwise it is likely to affect other parts of the body.