Unlike the "normal" popping sound that can come from stretching, which is painless, knee crepitus from arthritis is often quite painful. Luckily, there are several ways to detect osteoarthritis:  Look for signs of pain, redness, swelling, and stiffness while walking. The most common location of crepitus from arthritis is in the inner part of the knee. Feel for the presence of crepitus by placing one hand on top of the knee while flexing and extending the joint. Usually, crepitus results in a soft yet crunchy sensation. If the crepitus is accompanied by pain and signs of inflammation, apply ice packs (wrapped in a towel) to the area. Ice packs help decrease the swelling of the inflamed area and ease the associated pain.  You may also take small amounts of over-the-counter NSAIDs (non-steroidal anti-inflammatory drugs)  such as Advil (Ibuprofen) or Naproxen (Aleve) for quick pain relief. However, don't rely on these drugs for long-term pain relief, as they can affect the kidneys and gastrointestinal tract. The benefit of NSAIDs (which are anti-inflammatory medications) is that they not only diminish pain but also reduce inflammation. You may combine an NSAID with an over-the-counter painkiller such as Tylenol (Acetaminophen). This does not diminish inflammation, but it can help to diminish the pain, and the two medications in concert (an NSAID and Tylenol) can be extremely effective and helpful at getting you through your day-to-day activities pain-free. Prescription NSAIDs include Indocin, Daypro, Relafen, and a variety of other drugs. Prescription-strength anti-inflammatory drugs are stronger-acting than over-the-counter varieties and may prove more effective at fighting the pain and inflammation associated with knee crepitus. However, these stronger drugs require permission from a doctor, which usually means your knee crepitus will need to be clinically examined by one. Prescription NSAIDs can have side effects - most commonly, stomach irritation, but in severe cases (and in cases of overdose), stomach...

TL;DR in Vietnamese:
Nhận biết triệu chứng của viêm xương khớp. Giảm sưng cục bộ. Mua thuốc kháng viêm theo chỉ định của bác sĩ. Tiêm cortisone. Điều trị bằng phương pháp "bổ sung chất nhờn". Đeo nẹp đầu gối. Thảo luận về khả năng phẫu thuật.