Physical therapy for injured knee

Did you hurt your knee or have surgery? Or is it achy and stiff because of arthritis? Either way, you might feel like the last thing you should do is get on your feet and move your joint around. But often physical therapy (PT) is what your doctor suggests to get your strength back and put you on the road to recovery.

PT, or rehab as some people call it, can ease your muscle and joint pain. You’ll work with a physical therapist, a licensed professional who uses a variety of methods to help strengthen your muscles and make your body feel and move better.

Some things you might need are:

• Stretches and exercises
• Ice and heat
• Ultrasound massage
• Electrical nerve or muscle stimulation

When you get physical therapy depends on the cause of your pain. Sometimes it’s all you need for treatment. You might not need surgery.

If you do have an operation, your doctor will likely suggest at least a few weeks of therapy afterward to help you recover. They might recommend a specific physical therapy office, or you can find one near you by checking the American Physical Therapy Association’s website.

Physical therapy for knee pain involves a thorough evaluation and assessment of your entire lower extremity from your hip to your foot. Your PT can assess your knee pain and prescribe the right treatments — including exercises and modalities — to help decrease your knee pain and improve your overall mobility.

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Anatomy of the Knee

The human knee is a hinge joint that is comprised of the tibia (shin) and the femur (thigh). The patella, or kneecap, is located in the front of the knee. The knee is supported by four ligaments. Two shock absorbers, each called a meniscus, are found within the knee.

Pain in the knee can be caused by repetitive trauma and strain or injury. Occasionally it occurs for no apparent reason. When knee pain occurs, you may experience functional limitations that include difficulty walking, rising from sitting, or ascending and descending stairs.

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Click Play to Learn All About Physical Therapy for Knee Pain

This video has been medically reviewed by Laura Campedelli, PT, DPT.

What Type of Knee Pain Do You Have?

If you experience knee pain, it is important to determine if the pain is acute, sub-acute, or chronic in nature. This can help guide proper diagnosis and treatment.

• Acute Pain: Usually the most severe and occurs 1-7 days after injury. During this time, you should rest the knee and let the injured structures heal before initiating any motion.
• Sub-Acute Pain: This occurs from 2-6 weeks after injury. This is a good time to initiate gentle motion around the knee to help regain mobility.
• Chronic Knee Pain: Pain lasting greater than 8-12 weeks. Knee pain that is chronic should be evaluated by your healthcare provider.

Location of Knee Pain Symptoms

The location of your knee pain can help determine which structures are at fault and can help ensure proper treatment. Remember to check with your physician, physical therapist, or healthcare provider if symptoms are severe or last more than a few weeks.

• Pain in the Front of the Knee: If you feel pain in the front of the knee, there may be a problem with the tracking and position of the kneecap, often called patellofemoral stress syndrome (PFSS). The kneecap and the tendon between the kneecap and the shin may become inflamed and painful. Pain here usually limits the ability to kneel, ascend or descend stairs, or run and jump.

  

  

• Pain on the Inside of the Knee: If you have pain on the inside portion of the knee, there is likely an injury to the medial meniscus or medial collateral ligament. These structures are usually injured during athletic activity when the foot is planted on the ground, and the body twists over the knee. The medial meniscus is a shock absorber located inside the knee. Occasionally, it suffers from wear and tear or arthritis and can be damaged with no specific injury.
• Pain on the Outside of the Knee: Pain on the outside aspect of your knee can be the result of injury to many structures. There is a ligament there that may be injured during athletic activity. Pain here can also be caused by iliotibial band (ITB) stress.

  

   The ITB is a thick band of tissue that runs from the outside of your hip to the front of your knee. As it crosses the knee, the ITB can rub abnormally on the knee, and a burning pain can ensue. Also, on the outside part of the knee is one of the three hamstring tendons. Strain to this tendon may be a source of knee pain.

• Pain in the Back of the Knee: Pain in the back of the knee is rare but can occur. One of the hamstring tendons attaches here, and pain here is likely due to a hamstring strain. Another possible cause of pain here is a Baker’s cyst. This is an abnormal swelling of the knee joint that occupies space in the back of the knee and causes pain with excessive bending of the knee.

  

  

If you develop acute knee pain, immediately follow the R.I.C.E. principle. R.I.C.E. stands for Rest, Ice, Compression, and Elevation. After a few days of R.I.C.E., you can begin using the leg, only gently.

If knee pain persists for more than 2-3 weeks, you should visit a doctor, physical therapist, or another healthcare provider to rule out any major problem and to ensure proper diagnosis and management.

What to Expect From Physical Therapy for Knee Pain

If you are referred to physical therapy for knee pain, the initial visit is important to ensure correct diagnosis and proper management. During this visit, your physical therapist will interview you to gather information about the history of your problem, about the aggravating and relieving factors, and about any past medical history that may contribute the overall problem. From the information gathered during the history, a focused examination will be conducted. The examination may consist of several sections including, but not limited to:

• Gait Evaluation: An assessment of how you are walking. Physical therapists are trained to notice small changes in the motion around the knee during different phases of walking.
• Palpation: This involves using the hands to touch various structures around the knee to feel for abnormalities or to assess if a structure is painful to touch.
• Range of Motion Measurements: Range of motion refers to how far the knee is bending or straightening. The physical therapist may use special instruments to measure how your knee is moving to help direct treatment.
• Strength Measurements: There are many muscular attachments around the knee, and a measurement of strength can help determine if muscular weakness or imbalance is causing your knee pain.
• Assessment of Your Balance: If your balance is impaired, excessive stress and strain may be directed to your knee and cause pain.
• Girth or Swelling Measurements: Occasionally, swelling may be present in the knee joint after injury. A physical therapist may measure the amount of swelling to help direct treatment.
• Special Tests: Special tests are specific maneuvers performed around the knee to help determine which structure may be at fault and may be causing the problem.

PT Treatment for Knee Pain

After a focused examination has been completed, your physical therapist can work with you to initiate the correct treatment. It is very important for you to be active and engaged in the program. Often, exercises to help strengthen and improve the mobility of the knee will be prescribed. You may be required to perform exercises at home as well as part of a home exercise program.

Exercise should be your main tool for treating your knee pain. Exercises to help your knee pain may include:

• Quad sets and straight leg raises
• Short arc quads
• Exercises to strengthen your hips (Your hip muscles help control the position of your knees. Weakness here may cause knee pain.)
• Lower extremity stretches
• Balance exercises

Your PT will tell you how often to perform your exercises at home, and he or she should monitor your progress when you visit the PT clinic. He or she may also perform other treatments while you are in the PT clinic. These may include:

• Ultrasound
• Electric stimulation
• Kinesiology taping
• Application of heat or ice
• Soft tissue massages or knee joint mobilization

Keep in mind that passive treatments like ultrasound or estim have not been proven to be the most effective treatment for knee pain. They may feel good, but your focus with PT should be on restoring functional mobility. You should discuss the overall goal of each treatment so you have an understanding of what to expect.

If knee pain persists for more than two to three weeks or occurs as the result of major trauma, a visit to a physician or healthcare provider is recommended.

A Word From Verywell

The knee is a major joint in the body that is responsible for walking, climbing stairs, and rising from a seated position. Pain in the knee can limit one or all of these activities. By working with your physical therapist and by keeping the knee joint mobile and strong, problems with knee pain may be avoided, and your mobility can be maintained.