After a fall, what you put on your knee depends on the type of injury. For a scrape or abrasion, clean the wound and cover it with a non-stick bandage. For a bruise or deeper ache without broken skin, ice is your best first move. Most minor knee injuries from falls improve significantly within the first week when treated at home with the right approach at the right time.
If the Skin Is Broken: Clean It First
Dirt, grit, and bacteria can settle into a knee scrape within minutes, so cleaning the wound is the most important thing you can do right away. Rinse the area with clean running water or saline wound cleanser to flush out debris. If you don’t have saline on hand, mild soap and clean water work fine for minor scrapes. Avoid hydrogen peroxide or rubbing alcohol directly on the wound, as both can damage the tissue that’s trying to heal.
Once the scrape is clean, pat the area dry and apply a thin layer of petroleum jelly or an antibiotic ointment to keep the wound moist. Cover it with a non-stick bandage or gauze pad secured with medical tape. Knee scrapes are tricky because the joint bends constantly, so use a bandage large enough to stay in place and change it daily or whenever it gets wet or dirty.
If There’s No Open Wound: Start With Ice
When you’ve banged your knee but the skin isn’t broken, ice is the single best thing to apply in the first 48 to 72 hours. Cold constricts blood vessels, which limits swelling, reduces bruising, and numbs pain. Apply an ice pack (or a bag of frozen vegetables wrapped in a thin towel) for 20 minutes at a time, then remove it. You can repeat this every two hours while you’re awake.
Never place ice directly on bare skin. A layer of cloth between the ice and your knee prevents frostbite. If you don’t have an ice pack, a cold wet washcloth or a sealed bag of ice cubes will do.
The PRICE Method for the First 72 Hours
Sports medicine professionals use a five-step framework called PRICE for acute injuries: Protection, Rest, Ice, Compression, and Elevation. Here’s how each step applies to a banged-up knee:
- Protection: Avoid activities that could re-injure the knee. A simple knee brace or sleeve can help stabilize the joint if it feels wobbly.
- Rest: Stay off the knee as much as possible for the first 48 hours. If walking is painful, limit weight-bearing and use a cane or crutch.
- Ice: 20 minutes on, then off, every two hours during waking hours.
- Compression: Between icing sessions, wrap the knee with an elastic bandage. This acts as a physical barrier against swelling. Wrap snugly but not so tightly that your toes tingle or go numb.
- Elevation: Prop your leg up on pillows so your knee sits at or above heart level. This helps drain fluid away from the injured area.
When to Switch From Ice to Heat
Ice is the right choice for the first two to three days, while the injury is still fresh and swelling is active. Applying heat too early can actually increase inflammation and make the pain worse. Once the initial swelling has calmed down, usually after 48 to 72 hours, warmth becomes useful. A heating pad or warm towel relaxes tight muscles around the knee and increases blood flow, which supports healing and relieves stiffness.
A practical rule: if the knee still looks puffy or feels hot to the touch, stick with ice. Once the swelling has clearly plateaued or started going down, you can begin alternating heat and ice or switching to heat alone.
Topical Pain Relief Options
Over-the-counter anti-inflammatory gels can help manage knee pain when rubbed directly onto unbroken skin. Products containing diclofenac (sold as Voltaren gel in most pharmacies) are backed by solid evidence. In pooled research, topical diclofenac provided significantly more pain relief than placebo within the first one to two weeks, and the benefits held up over longer periods as well. Diclofenac patches showed a slightly larger effect in the short term, while the liquid solution performed well over several weeks.
These gels are typically applied three to four times daily. They work locally, so they deliver less of the drug to the rest of your body compared to swallowing a pill. Menthol-based creams (like Biofreeze or IcyHot) provide a cooling or warming sensation that can temporarily distract from pain, though they don’t reduce inflammation the way diclofenac does. Whichever product you choose, never apply it to broken or scraped skin.
Over-the-Counter Pain Relievers
If topical treatments aren’t enough, oral pain relievers can help. Ibuprofen reduces both pain and swelling, making it a good fit for the first few days after a fall. Acetaminophen relieves pain but doesn’t address inflammation, so it’s better suited for people who can’t tolerate anti-inflammatory medications. Combination tablets containing both ibuprofen and acetaminophen are also available. Follow the dosing instructions on the package and avoid exceeding the daily maximum listed on the label.
What About Arnica?
Arnica creams and gels are widely marketed for bruising and swelling, and you’ll see them in most pharmacies. The evidence, however, is underwhelming. A controlled trial comparing homeopathic arnica to placebo found no difference in pain or bruising at day four. Arnica gel (as opposed to homeopathic tablets) has slightly more plausible mechanisms because it delivers plant compounds directly to the skin, but the clinical data supporting it for acute injuries remains thin. It’s unlikely to cause harm on intact skin, but ice and a proven anti-inflammatory gel will do more.
Signs the Injury May Be Serious
Most knee falls produce nothing worse than a bruise or scrape that heals on its own. But certain signs suggest something more than soft tissue damage. Emergency physicians use a set of criteria called the Ottawa Knee Rules to determine whether an X-ray is needed. You should get your knee evaluated if any of the following apply:
- You’re 55 or older
- You couldn’t bear weight for four steps immediately after the fall, or you can’t do so now
- You have tenderness only over the kneecap (and nowhere else)
- You have tenderness at the top of the smaller bone on the outside of your lower leg (the fibular head)
- You can’t bend the knee to a 90-degree angle
Any of these findings raises the likelihood of a fracture and warrants imaging.
Signs of Wound Infection
If your fall left a scrape, keep an eye on the healing process over the next several days. Normal scrapes gradually form a scab, stop hurting, and close within about ten days. Infection looks different: pus or cloudy fluid draining from the wound, a yellow crust that keeps forming, redness that spreads outward rather than shrinking, or increasing pain and swelling after the first 48 hours. A red streak running from the wound toward your body is a particularly urgent sign and calls for same-day medical attention. Fever alongside any wound change also signals infection.
What to Expect During Recovery
A simple knee bruise typically hurts the most in the first two to three days, with swelling and discoloration fading over one to two weeks. Bruises that still hurt after a week may involve deeper tissue or a bone bruise, which takes longer to resolve but generally heals on its own. Occasionally, a knee bruise stays swollen and forms a firm lump (sometimes described as golf-ball sized), which is usually a pocket of fluid or blood that the body reabsorbs over time.
The best gauge of recovery is the trend. If pain and swelling are improving day over day, even slowly, you’re on track. Gentle movement, like bending and straightening the knee, helps prevent stiffness once the acute pain settles. If the swelling isn’t improving after a week, or the knee feels unstable when you walk, that’s worth a medical evaluation to rule out ligament or cartilage damage.