Many people’s knees squeak or crack or even crackle, a phenomenon known ascrepitus. In fact, most of the time it’s no big deal at all.
但是，大声的弹出声音可能会让您停下来 - 理所当然。这种流行可能伴随着疼痛和肿胀，表明发生了伤害。这种噪音有时被称为
有时，膝盖受伤可能是轻度的，但也可能足够严重以需要手术。直到医生看一下膝盖，您才能确定。
If you suddenly hear a noticeable popping sound coming from your knee, it’s pretty safe to assume that something is wrong, although the degree of injury can vary. Here are some of the possible causes.
ACL tear
One of the hallmark signs of a撕裂前交叉韧带（ACL）in the knee is a loud popping sound, which is usually followed by intense pain. You might not be able to stand or put weight on the affected leg.
PCL injury
Your ACL isn’t the only knee ligament that can get injured. However, aninjury to your posterior cruciate ligament (PCL)at the back of your knee joint is less common than an ACL injury. It’s also less likely than an ACL tear to make the same kind of loud popping noise at the time of injury. You’ll probably experience some pain and swelling.
MCL injury
A tear to the内侧副韧带（MCL）in your knee can also cause some pretty severe pain and swelling, and an audible popping noise can occur when the ligament tears. The pain can vary, depending on whether you stretch it or you actually tear it. Later, you’ll likely feel some swelling and stiffness, perhaps an inability to bend and straighten your knee.
LCL injury
The last of the four big ligaments in the knee, thelateral collateral ligament (LCL)is a pretty commonly injured ligament. But it may be injured along with another ligament in the knee, so while you may hear a pop or a ripping sound if it’s torn, it could also be the sound of another ligament. You’ll feel pain, weakness, and perhaps numbness or stiffness.
Meniscus tear
A sudden pivot or rotation, or direct pressure, can tear one of the two pieces of cartilage sandwiched between your thighbone and shinbone. Known as a半月板撕裂，这种伤害会产生弹出声。
疼痛，肿胀，移动难度以及可能随之而不稳定。如果软骨变得松动并阻塞膝关节，您也可能会感到奇怪的滑动感觉。
Cartilage injury
If a piece of cartilage becomes damaged, it can make a popping noise as your knee moves back and forth.
Patellar tendon tear
Your patellar tendon connects the top of your shinbone to the top of your kneecap. It can become inflamed, which is known aspatellar tendonitis, or it can tear.
You may hear a tearing or popping sound if it tears. You might not be able to straighten your leg, and your kneecap may feel like it’s moving up into your thigh. You might also develop some pain, cramping, bruising, and an indentation at the bottom of your kneecap.
Knee arthritis
Knee arthritis, which is also known as osteoarthritis, develops when the cartilage that separates the bones in your knee joint breaks down. When you move your knee, you can feel the bones grating or grinding against each other, which can cause popping sounds.
None of the injuries above should be shrugged off. See a doctor right away if you experience one. In the meantime, stay off your knee and apply ice to it to keep the swelling down. If you don’t think you can put any weight on it, don’t try.
The popping noise might occur after you collide with another person, or it might happen after you rotate, pivot, or jump and land hard. Regardless of what you were doing or your level of fitness, if you hear the “pop,” get it checked out. You may need some tests to determine the cause and the extent of the damage.
Additionally, getting treatment is important, as it may help you avoid other injuries down the road. A
A doctor will perform a physical examination of your knee, taking note of any bruising, swelling, or other abnormalities that have developed. This will also likely include some range of motion tests to see what happens if your knee is bent or rotated.
For example, if the doctor suspects an ACL tear, they might perform certain physical diagnostic tests like theLachman testand the前抽屉测试to test your ACL stability. If it looks like it might be a meniscus tear, they might perform aMcMurray test, which puts some stress on the meniscus to see how it reacts.
Next, you’ll likely have imaging tests. An X-ray is often the next step, followed by an MRI scan, to get a better look at the ligaments and structures in your knee.
The specifics of your treatment will vary based on your diagnosis.
RICE
TheRICEapproach, which stands for rest, ice, compress, and elevate, is helpful for treating injuries at home, including knee injuries. Sports medicine experts typically recommend using this approach for 2 or 3 days after sustaining the injury.
缓解疼痛的药物
Yep, a knee injury can hurt. Your doctor may recommendnonsteroidal anti-inflammatory drugs (NSAIDs)to help reduce the pain, or you may even be a candidate forcorticosteroid injections.
锻炼
Your doctor might suggest incorporating someknee exercisesinto your routine to improve your flexibility and your knee’s range of motion.
Research from 2014suggests that land-based exercise can help improve function and pain and that water-based exercise may also help with knee function.
Knee braces and other supports
If your noisy knee is the result of osteoarthritis, your doctor might suggest using a膝盖支撑or knee sleeve to support your knee joint, asresearch from 2014暗示这可能会有所帮助。
鞋子中的矫形插件也可能有所帮助。它可能不会消除噪音，但是拐杖也可以帮助您更轻松地解决。
Physical therapy
在某些情况下，单独的物理治疗在恢复时间后可能足以帮助您在膝盖受伤中康复。但是，手术后通常也建议您帮助人们恢复力量和流动性。
Surgery
Surgery may be necessary to repair some partially or completely torn ligaments.
For example, your doctor may recommendACL reconstruction撕裂ACL后，您可以恢复膝盖的力量和稳定性。从身体的另一部分或供体的韧带将取代撕裂的韧带。
Atorn meniscus可能需要关节镜手术切除dama的吗ged meniscus tissue or sew the edges of the torn meniscus together.
Don’t grin and bear it. If your knee makes a loud popping noise (or even a series of popping sounds), get it checked out right away.