Ankle Instability

Ankle instability is a condition in which the ankle joint is unstable. In order to understand ankle instability it is important to understand the anatomy of the ankle. The ANKLE is a joint (junction of two or more bones) which connects the foot to the leg. It is comprised of one foot bone called the talus and two long leg bones called the tibia (on the inside) and the fibula (on the outside). The three bones are held together by many ligaments. Ligaments are soft tissue ‘bands’ that connect bone to bone. (not to be confused with tendons that connect muscle to bone). The entire ankle complex is surrounded by a soft tissue envelope called a capsule. This is usually a sealed envelope. 

Below is a list of causes of ankle instability:

TRAUMA:
Ankle sprain (link)

Ankle fracture

Tendon Trauma
Ankle position – varus or valgus

Foot position
Genetic conditions
With these problems the strength and stability of the ankle is compromised.  Imagine a rubber band that loses its elasticity and can no longer hold items tight. If the rubber band becomes weakened the items inside would become loose and patients usually state their ankles “give out” while walking.   When the ligaments cannot hold the bones of the ankle tight there is a rocking or wobbling that occurs between the bones at the joint. It may be very slight at first however as we age and there will be more “wear and tear” on the ankle joint.

 

DIAGNOSIS:

After a trauma or injury, we perform an examination, take x-rays and usually an MRI is ordered.  The x-rays will help evaluate the position and bone structure of the ankle and an MRI gives a better picture of the soft tissue, namely, the capsule and ligaments. 

TREATMENT:

Conservative care is either with a fitted boot, an ankle strap (dispensed on site for adults and kids), rehabilitation program and/or icing.  Sometimes, if a complete tear is present or if there is pain or instability after initial treatment then surgery is indicated.  Dr. Schoenhaus and Dr. Gold are both board certified in foot and ankle surgery. Newer techniques allow them to re-enforce the ligaments after primary repair with either a graft(link) or fiber wire (link), this makes the repair stronger and you do not have to sacrifice a tendon.   Post procedure care depends on the extent of the injury and ranges from immediate walking and physical therapy to three weeks off of the ankle.