The DonJoy IceMan is a cold therapy device that circulates ice water through a pad wrapped around your knee, delivering consistent cooling that’s more effective than a basic ice pack. Setting it up is straightforward, but a few details, especially around skin protection and session timing, make the difference between good recovery support and a painful mistake.
What You Need Before Starting
The IceMan system has three main components: a cooler (the reservoir), tubing, and a knee wrap pad. Before your first use, connect the tubing between the cooler and the pad. The connectors click into place. Make sure the tubing isn’t kinked or pinched, since that will block water flow and leave you with a warm pad.
You’ll also need a thin barrier between the pad and your skin. This is not optional. An FDA adverse event report describes a patient who skipped the barrier and developed ice burns along both sides of her surgical incision. A single layer of clothing, a thin towel, or the fabric sleeve that comes with some IceMan models works fine. If you’ve had surgery, your surgical dressing typically serves as the barrier, but confirm this with your surgeon’s office if you’re unsure.
Filling the Cooler
Open the cooler lid and add ice up to the fill line marked inside. Then add cold water up to the same fill line. Ice goes in first, water second. Using too little ice means the water warms up quickly and you’ll get less effective cooling. Using too much water without enough ice has the same problem. The fill line exists to get the ratio right, so use it rather than eyeballing.
You’ll need to refill the ice as it melts, typically every few hours depending on how warm your room is. If the water coming through the pad starts feeling lukewarm, it’s time for fresh ice. You don’t need to dump all the water out each time. Just drain some, add more ice, and top off with cold water back to the fill line.
Positioning the Knee Pad
Place the pad so it covers the area of your knee that needs cooling. For post-surgical use, this usually means centering the pad over the front and sides of the knee, covering the incision site or the most swollen area. The pad has straps that wrap around your leg and secure with Velcro. Snug is good, but tight is not. You want the pad to stay in contact with your knee without compressing it so much that circulation is restricted.
If you notice your toes turning white or blue, or your lower leg feeling tingly beyond normal cold sensations, the wrap is too tight. Loosen the straps and reposition. Once the pad is in place and connected to the cooler via tubing, the unit pumps cold water through channels inside the pad. Some models have a power button, others start circulating once connected. Check your specific model’s quick start card if you’re not sure which applies.
How Long to Use It Per Session
Most post-surgical protocols call for 20 to 30 minutes of cold therapy at a time, followed by a break of at least 20 minutes before reapplying. Some surgeons recommend longer sessions with the IceMan specifically because the circulating water delivers a more controlled, less intense cold than a bag of ice pressed directly against skin. Follow whatever schedule your surgeon or physical therapist gave you.
In the first 48 to 72 hours after knee surgery, you’ll likely use the IceMan frequently, sometimes cycling through sessions for most of the day. After that initial period, the need for constant icing usually tapers off, and you might use it a few times a day or after physical therapy sessions when swelling flares up.
Monitoring Your Skin
Check the skin under the pad regularly during each session. Johns Hopkins Medicine recommends stopping cold therapy immediately if you lose feeling in the skin being cooled. Some numbness is normal early on, especially after surgery when the area is already partially numb. But a complete loss of sensation in skin that previously had feeling is a sign to remove the pad and let the area warm up.
Look for skin that appears unusually white, bright red, or blistered. These are signs of cold injury. The barrier layer between your skin and the pad prevents most problems, but damaged or thinning skin (common in older adults or people on certain medications) is more vulnerable. If you notice any of these changes, take a longer break before your next session and add an extra layer of fabric as a barrier.
Elevating Your Leg During Use
Cold therapy works best for knee swelling when your leg is elevated at the same time. Prop your leg up on pillows so your knee sits at or above the level of your heart. This lets gravity help drain fluid away from the swollen area while the cold constricts blood vessels and slows new swelling. Lying on a couch or bed with two or three pillows stacked under your calf is the simplest setup. Avoid placing pillows directly under the back of your knee, which can put pressure on the joint and restrict blood flow.
Cleaning and Storing the Unit
After each day of use, dump out the remaining water and leave the cooler lid open to air dry. If you’re using the IceMan over several days or weeks, clean it periodically to prevent mold and bacteria buildup inside the cooler and tubing. The manufacturer’s instructions call for filling the cooler with warm water to the fill line and adding one to two tablespoons of bleach. Let the solution circulate through the tubing for a few minutes, then drain and rinse thoroughly with clean water.
When you’re done with the device entirely, run this cleaning cycle one final time, let everything dry completely, and store it with the lid open. Storing it sealed while still damp is the fastest way to grow mold inside the tubing, which is difficult to clean out once established.
Troubleshooting Common Issues
If the pad isn’t getting cold, check three things in order: Is there enough ice in the cooler? Is the tubing connected securely at both ends? Is there a kink in the tubing? Most “it’s not working” problems come down to one of these. Air bubbles trapped in the tubing can also reduce flow. Gently lifting and tilting the tubing while the unit runs usually clears them.
If water is leaking from the pad or connections, make sure the tubing is fully clicked into the ports. A loose connection will drip steadily. Pads can also develop small punctures over time, especially if they’ve been folded sharply or stored compressed. If you spot a leak in the pad itself, it needs to be replaced. Replacement pads are sold separately and are specific to the IceMan model you have.