A sprained
ankle is a very common injury. Approximately 25,000 people experience it each
day. A sprained ankle can happen to athletes and non-athletes, children and
adults. It can happen when you take part in sports and physical fitness
activities. It can also happen when you simply step on an uneven surface, or
step down at an angle.
The
ligaments of the ankle hold the ankle bones and joint in position. They protect
the ankle joint from abnormal movements-especially twisting, turning, and
rolling of the foot.
A ligament
is an elastic structure. Ligaments usually stretch within their limits, and
then go back to their normal positions. When a ligament is forced to stretch
beyond its normal range, a sprain occurs. A severe sprain causes actual tearing
of the elastic fibers.
Ankle
sprains happen when the foot twists, rolls or turns beyond its normal motions.
A great force is transmitted upon landing. You can sprain your ankle if the
foot is planted unevenly on a surface, beyond the normal force of stepping.
This causes the ligaments to stretch beyond their normal range in an abnormal
position.
If there
is a severe in-turning or out-turning of the foot relative to the ankle, the
forces cause the ligaments to stretch beyond their normal length. If the force
is too strong, the ligaments can tear. You may lose your balance when your foot
is placed unevenly on the ground. You may fall and be unable to stand on that
foot. When excessive force is applied to the ankle's soft tissue structures,
you may even hear a "pop". Pain and swelling result.
The amount
of force determines the grade of the sprain. A mild sprain is a Grade 1. A
moderate sprain is a Grade 2. A severe strain is a Grade 3 (see Table below).
Slight
stretching and some damage to the fibers (fibrils) of the ligament.
Partial
tearing of the ligament. If the ankle joint is examined and moved in certain
ways, abnormal looseness (laxity) of the ankle joint occurs.
Complete
tear of the ligament. If the examiner pulls or pushes on the ankle joint in
certain movements, gross instability occurs.
Severity
|
Physical
Examination
Findings
|
Impairment
|
Pathophysiology
|
Typical Treatment*
|
Grade 1
|
Minimal tenderness and swelling
|
Minimal
|
Microscopic tearing of collagen
fibers
|
Weight bearing as tolerated
No splinting/casting
Isometric exercises
Full range-of-motion and
stretching/ strengthening exercises as tolerated
|
Grade 2
|
Moderated tenderness and swelling
Decreased range of motion
Possible instability
|
Moderated
|
Complete tears of some but not all
collagen fibers in the ligament
|
Immobilization with air splint
Physical therapy with
range-of-motion and stretching/ strengthening exercises
|
Grade 3
|
Significant swelling and
tenderness
Instability
|
Severe
|
Complete tear/ rupture of ligament
|
Immobilization
Physical therapy similar to that
for grade 2 sprains but over a longer period
Possible surgical reconstruction
|
Diagnosis
See your
doctor to diagnose a sprained ankle. He or she may order X-rays to make sure
you don't have a broken bone in the ankle or foot. A broken bone can have
similar symptoms of pain and swelling.
The
injured ligament may feel tender. If there is no broken bone, the doctor may be
able to tell you the grade of your ankle sprain based upon the amount of
swelling, pain and bruising.
The
physical exam may be painful. The doctor may need to move your ankle in various
ways to see which ligament has been hurt or torn.
If there
is a complete tear of the ligaments, the ankle may become unstable after the
initial injury phase passes. If this occurs, it is possible that the injury may
also cause damage to the ankle joint surface itself.
The doctor
may order an MRI (magnetic resonance imaging) scan if he or she suspects a very
severe injury to the ligaments, injury to the joint surface, a small bone chip
or other problem. The MRI can make sure the diagnosis is correct. The MRI may
be ordered after the period of swelling and bruising resolves.
The amount
of pain depends on the amount of stretching and tearing of the ligament.
Instability occurs when there has been complete tearing of the ligament or a
complete dislocation of the ankle joint.
Nonsurgical
Treatment
Walking may be difficult because of
the swelling and pain. You may need to use crutches if walking causes pain.
Usually swelling and pain will last two days to three days. Depending upon the
grade of injury, the doctor may tell you to use removable plastic devices such
as castboots or air splints.
Most ankle
sprains need only a period of protection to heal. The healing process takes
about four weeks to six weeks. The doctor may tell you to incorporate motion
early in the healing process to prevent stiffness. Motion may also aid in being
able to sense position, location, orientation and movement of the ankle
(proprioception). Even a complete ligament tear can heal without surgical
repair if it is immobilized appropriately. Even if an ankle has a chronic tear,
it can still be highly functional because overlying tendons help with stability
and motion.
For a
Grade 1 sprain, use R.I.C.E (rest, ice, compression and elevation):
·Rest your
ankle by not walking on it.
·Ice should
be immediately applied. It keeps the swelling down. It can be used for 20
minutes to 30 minutes, three or four times daily. Combine ice with wrapping to
decrease swelling, pain and dysfunction.
·Compression dressings,
bandages or ace-wraps immobilize and support the injured ankle.
·Elevate your
ankle above your heart level for 48 hours.
For a
Grade 2 sprain, the RICE guidelines can also be used. Allow more time for
healing to occur. The doctor may also use a device to immobilize or splint the
ankle.
A Grade 3
sprain can be associated with permanent instability. Surgery is rarely needed.
A short leg cast or a cast-brace may be used for two weeks to three weeks.
Rehabilitation
is used to help to decrease pain and swelling and to prevent chronic ankle
problems. Ultrasound and electrical stimulation may also be used as needed to
help with pain and swelling. At first, rehabilitation exercises may involve
active range of motion or controlled movements of the ankle joint without
resistance. Water exercises may be used if land-based strengthening exercises, such
as toe-raising, are too painful. Lower extremity exercises and endurance
activities are added as tolerated. Proprioception training is very important,
as poor propriception is a major cause of repeat sprain and an unstable ankle
joint. Once you are pain-free, other exercises may be added, such as agility
drills. The goal is to increase strength and range of motion as balance
improves over time.
All ankle
sprains recover through three phases:
·Phase 1 includes
resting, protecting the ankle and reducing the swelling (one week).
·Phase 2 includes
restoring range of motion, strength and flexibility (one week to two weeks).
·Phase 3 includes
gradually returning to activities that do not require turning or twisting the
ankle and doing maintenance exercises. This will be followed later by being
able to do activities that require sharp, sudden turns (cutting activities)
such as tennis, basketball or football (weeks to months).
Medication
Nonsteroidal anti-inflammatory drugs
(NSAIDs) may be used to control pain and inflammation.
Long-term outcome
If an ankle sprain is not
recognized, and is not treated with the necessary attention and care, chronic
problems of pain and instability may result.
Surgical
Treatment
Surgical treatment for ankle sprains
is rare. Surgery is reserved for injuries that fail to respond to nonsurgical
treatment, and for persistent instability after months of rehabilitation and
non-surgical treatment.
Surgical
options include:
·Arthroscopy
A surgeon looks inside the joint to see if there are any loose fragments of
bone or cartilage, or part of the ligament caught in the joint.
·Reconstruction
A surgeon repairs the torn ligament with stitches or suture, or uses other ligaments
and/or tendons found in the foot and around the ankle to repair the damaged
ligaments.
Rehabilitation
after surgery involves time and attention to restore strength and range of
motion so you can return to pre-injury function. The length of time you can
expect to spend recovering depends upon the extent of injury and the amount of
surgery that was done. Rehabilitation may take from weeks to months.
The best
way to prevent ankle sprains is to maintain good strength, muscle balance and
flexibility.
- Warm-up before doing exercises
and vigorous activities
- Pay attention to walking,
running or working surfaces
- Wear good shoes
- Pay attention to your body's
warning signs to slow down when you feel pain or fatigue
If you
have sprained your ankle in the past, you may continue to sprain it if the
ligaments did not have time to completely heal. If the sprain happens
frequently and pain continues for more than four weeks to six weeks, you may
have a chronic ankle sprain. Activities that tend to make an already sprained
ankle worse include stepping on uneven surfaces, cutting actions and sports
that require rolling or twisting of the foot, such as trail running,
basketball, tennis, football and soccer.
Possible
complications of ankle sprains and treatment include abnormal proprioception.
There may be imbalance and muscle weakness that causes a re-injury. If this
happens over and over again, a chronic situation may persist with instability,
a sense of the ankle giving way (gross laxity) and chronic pain. This can also
happen if you return to work, sports or other activities without letting the
ankle heal and become rehabilitated.