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Physical Examination

Your doctor will diagnose your ankle sprain by asking you questions about the injury and performing a careful examination of your foot and ankle. Due to the swelling and inflammation, this physical exam may be painful and often includes:

• Observation. Your doctor will look at the injured ankle and compare it to your other ankle. Often, the sprained ankle is swollen and bruised over the injured ligaments. 
• Palpation. Tenderness is often limited to the area directly over the injured ligaments. Your doctor will gently press around the ankle to determine which ligaments are injured.
• Range of motion testing. The doctor may move your ankle in different directions; however, it may be difficult to move a stiff, swollen ankle.
• Stability testing. Your doctor may manipulate or pull your ankle in several directions in a controlled manner to assess the stability of the ankle joint.

Your doctor may be able to tell the severity of your ankle sprain based on the amount of swelling, pain, bruising, and stability. If you have difficulty bearing weight, or tenderness in the bones of the foot and ankle, you may need additional tests to rule out a fracture. 

To diagnose a sprain, your doctor will gently palpate around the outside of the ankle in the area of the pain (arrow).

Reproduced from JF Sarwark, ed: Essentials of Musculoskeletal Care, ed 4. Rosemont, IL, American Academy of Orthopaedic Surgeons, 2010.

Imaging Tests

An ankle sprain is largely a clinical diagnosis based on how the injury happened, symptoms, and examination by a medical professional. Occasionally, imaging studies, such as X-rays and magnetic resonance imaging (MRI) scans, are obtained to rule out a fracture or other injury to the nearby tendons and cartilage. 

X-rays. X-rays provide images of dense structures, such as bone. Depending on your symptoms and examination, your doctor may order X-rays to evaluate the bones in your ankle and foot. Severe ankle sprains can have a similar degree of pain, bruising, and swelling as a fracture, making it difficult to distinguish between the two. 

Stress X-rays. In addition to plain X-rays, your doctor may also order stress X-rays. These images are taken while the ankle is being pushed in different directions in a controlled manner. Stress X-rays help to show whether the ankle is unstable because of injured ligaments.

Magnetic resonance imaging (MRI) scan. An MRI scan is not required to diagnose ankle sprains. Your doctor may obtain an MRI:

• To evaluate other structures, such as cartilage and tendons, around the ankle
• If you exhibit signs of a high ankle sprain — an injury to the ligaments and structures connecting the bones of the lower leg (tibia and fibula)
• If your symptoms persist beyond 6 to 8 weeks after the injury despite conservative treatment

Grade 1 

• Slight stretching and microscopic tearing of the ligament fibers
• Mild tenderness, bruising, and swelling around the ankle
• Typically no pain with weightbearing
• No instability on examination

Grade 2 

• Partial tearing of the ligament
• Moderate tenderness, bruising, and swelling around the ankle
• Mild pain with weightbearing
• Slight instability on examination

Grade 3 

• Complete tear of the ligament
• Significant tenderness, bruising, and swelling around the ankle
• Severe pain with weightbearing
• Substantial instability on examination

A Grade 2 sprain results in partial tearing of the ligament or ligaments. This commonly leads to moderate swelling and bruising above and below the ankle joint.

Home Treatments

For milder sprains, your doctor may recommend simple home treatment.

The RICE protocol. Follow the RICE protocol as soon as possible after your injury:

• Rest your ankle by not walking on it or returning to sport. 
• Ice should be immediately applied to keep the swelling down. It can be used for 20 to 30 minutes, 3 or 4 times daily. Do not apply ice directly to your skin.
• Compression dressings, bandages, or ace-wraps will immobilize and support your injured ankle. The compression may also help with swelling.
• Elevate your ankle above the level of your heart as often as possible during the first 48 hours. Elevation also helps control the swelling.

Medication. Nonsteroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen and naproxen can help control pain and swelling. Because they improve function by both reducing swelling and controlling pain, they are a better option for mild sprains than narcotic pain medicines.

An air stirrup-type ankle brace.

Reproduced from JF Sarwark, ed: Essentials of Musculoskeletal Care, ed 4. Rosemont, IL, American Academy of Orthopaedic Surgeons, 2010.

Physical therapy. Rehabilitation exercises during phase 2 and 3 of recovery are used to improve flexibility, strength, and proprioception (balance).

• Early motion. To prevent stiffness, your doctor or physical therapist will provide you with exercises that involve range-of-motion or controlled movements of your ankle without resistance.
• Strengthening exercises. Once the swelling and pain have improved, exercises to strengthen the dynamic stabilizers (muscles and tendons) in the front and back of your leg and ankle will be added to your treatment plan. Water exercises may be used if weightbearing strengthening exercises, such as toe-raising, are too painful. Exercises with resistance are added as tolerated.
• Proprioception (balance) training. Poor balance often leads to repeat sprains and ankle instability. A good example of a balance exercise is standing on the affected foot with the opposite foot raised and eyes closed. Balance boards are often used in this stage of rehabilitation.
• Endurance and agility exercises. Once you are pain-free, other exercises, such as agility drills, may be added gradually. Running in progressively smaller figures-of-8 is excellent for agility and calf and ankle strength. The goal is to increase strength and range of motion as balance improves over time.

Once you are pain-free, resistance exercises may be added to your therapy program to strengthen the muscles around your ankle.

Reproduced from JF Sarwark, ed: Essentials of Musculoskeletal Care, ed 4. Rosemont, IL, American Academy of Orthopaedic Surgeons, 2010.

Surgical Treatment

Surgical treatment for ankle sprains is rare.

• Surgery is reserved for injuries that fail to respond to nonsurgical treatment, and for patients who experience persistent ankle instability and pain after months of rehabilitation and nonsurgical treatment.
• Surgery may also be indicated for some high ankle sprains with instability of the ankle syndesmosis.
• Sometimes surgery is recommended if a severe ankle sprain is associated with additional injuries, such as an ankle cartilage injury or tendon rupture.

This X-ray shows extreme instability of the ankle.

Espinosa N, Bluman EM: Lateral Ankle Ligament Reconstruction Using Allograft, in Flatow E, Colvin AC, eds: Atlas of Essential Orthopaedic Procedures. Rosemont, IL, American Academy of Orthopaedic Surgeons, 2013, pp 349-355.

Types of surgery

Surgical options include:

• Arthroscopy. During arthroscopy, your doctor uses a small camera, called an arthroscope, to look inside your ankle joint. Miniature instruments are used to remove any loose fragments of bone or cartilage, or parts of the ligament that may be caught in the joint.
• Repair/reconstruction. Your doctor may be able to repair the torn ligament with stitches or sutures. In some cases, they will reconstruct the damaged ligament by replacing it with a tissue graft obtained from other ligaments and/or tendons found in the foot and around the ankle.

Recovery

Immobilization. There is typically a period of immobilization after surgery. A cast or protective boot is applied to protect the ligaments. Be sure to follow your doctor's instructions about how long to wear the protective device; early mobility or weightbearing can re-tear the repair or the reconstructed ligament.

Rehabilitation. Rehabilitation after surgery involves restoring strength and range of motion so you can return to pre-injury function. The length of time you can expect to spend recovering depends on the extent of injury and the surgery that was performed. Rehabilitation may take weeks to months.

Chronic Ankle Sprains

Once you have sprained your ankle, you may continue to sprain it if the ligaments do not have time to completely heal. This can happen if you return to work, sports, or other activities before your ankle heals and is rehabilitated. It may be difficult to determine whether the ligament is completely healed, but symptoms (pain and swelling) can often guide the advancement of physical therapy and function. 

If pain continues for more than 4 to 6 weeks, you may have a chronic ankle sprain. Things that tend to make an already sprained ankle worse include:

• Stepping on uneven surfaces
• Participating in sports that require cutting actions, or rolling and twisting of the foot

Abnormal proprioception — a common complication of ankle sprains — can also lead to repeat sprains.

Reinjury may result in chronic instability, pain, and damage to the underlying cartilage and bones.