脑梗积水是一种严重的病情，它会导致脑部供血不足，进而引发肿胀和无力的症状。这个问题涉及到脑梗塞和积水两个方面，我们将在下文中逐一说明。

首先，让我们来了解一下脑梗塞是怎么引起的。脑梗塞是指由于脑血管堵塞，导致脑部血液供应中断的情况。当血管堵塞时，血液无法顺利流向脑部，导致脑细胞因缺氧而受损甚至死亡。这会导致脑组织的肿胀，进而引发腿部肿胀和无力的症状。

其次，让我们来理解一下积水是如何影响腿部的。脑梗塞引起的血液供应中断会导致液体在脑部积聚。这些积水会对脑组织施加压力，进而传导到周围的神经系统。脑部压力的改变可能会干扰正常的神经传递，导致肌肉无力和腿部肿胀的症状。此外，积水还会对脑细胞的正常功能产生影响，进一步削弱腿部肌肉的力量。

要解决腿部肿胀和无力的问题，我们需要采取一些治疗措施。首先，针对脑梗塞的治疗非常重要。这可能包括药物治疗、介入手术或者其他治疗方法，以恢复脑部的供血。同时，积水问题也需要得到解决。医生可能会通过手术或者引流等方式来减轻脑部压力，从而缓解肿胀和无力的症状。除此之外，康复治疗也很关键，可以帮助患者恢复肌肉的力量和灵活性。

总结起来，脑梗积水导致腿部肿胀和无力是由于脑血液供应中断和脑部积水造成的。通过治疗脑梗塞和减轻脑部压力，可以缓解这些症状。同时，康复治疗也是恢复腿部功能的重要一环。因此，对于这种情况，及时就医和科学治疗非常重要。

Brain infarction with hydrocephalus can lead to swelling and weakness in the legs. This issue involves two aspects, namely cerebral infarction and hydrocephalus, which will be explained separately in the following paragraphs.

Firstly, let's understand how cerebral infarction occurs. Cerebral infarction refers to the interruption of blood supply to the brain due to the blockage of blood vessels. When the blood vessels are blocked, blood cannot flow smoothly into the brain, leading to oxygen deficiency and damage or even death of brain cells. This causes swelling in the brain tissue, which in turn leads to swelling and weakness in the legs.

Secondly, let's understand how hydrocephalus affects the legs. The interruption of blood supply caused by cerebral infarction can result in the accumulation of fluid in the brain. This accumulated fluid exerts pressure on the brain tissue, which is then transmitted to the surrounding nervous system. Changes in brain pressure may interfere with normal nerve transmission, resulting in muscle weakness and swelling in the legs. Furthermore, the accumulated fluid also impairs the normal function of brain cells, further weakening the strength of leg muscles.

To address leg swelling and weakness, some treatment measures need to be taken. Firstly, it is crucial to treat cerebral infarction. This may involve medication, interventional surgery, or other treatment methods to restore blood supply to the brain. At the same time, the issue of hydrocephalus needs to be resolved. Doctors may reduce brain pressure through surgery or drainage to alleviate swelling and weakness. In addition, rehabilitation therapy is also essential in helping patients regain muscle strength and flexibility.

In summary, leg swelling and weakness caused by cerebral infarction with hydrocephalus are a result of interrupted blood supply to the brain and brain fluid accumulation. By treating cerebral infarction and reducing brain pressure, these symptoms can be relieved. Rehabilitation therapy plays a crucial role in recovering leg function. Therefore, timely medical attention and appropriate treatment are important for this condition.