Ankle sprains and strains have similar symptoms, causes and risk factors, but they also have some differences. Ankle sprains are usually a result of a traumatic or acute injury, while ankle strains can be acute or chronic. Acute injuries of the ankle occur suddenly and are caused by a single episode, whereas a chronic injury tends to develop after a period of time with repetitive movement or overuse. The ankle joint is formed by the tibia in the lower leg and the talus bone in the foot. There are dozens of ligaments to support the ankle and several muscles and tendons to provide strength and stability. If any of the ligaments are overstretched or disrupted, an ankle sprain may result. When the muscles or tendons are affected, a strain can occur.
-
Symptoms
The main difference between a sprain and strain is the onset of the pain, swelling, redness and reduced range of motion at the ankle. When an ankle sprain occurs, there may be an audible pop or a popping feeling, followed by bruising at the site and intense pain at the time of the injury. A strain will typically occur over time and can also result in weakness and instability around the ankle joint. A strain can also occur from a one-time injury or possibly at the same time as a sprain. Sprains and strains are graded from 1 to 3 and based on severity. Severity ranges from minor tearing to complete tearing of the soft tissues. Symptoms will be worse the higher the grade.
-
Causes
Ankle sprains and strains have similar risk factors including overtraining causing ligament or muscle fatigue, poor athletic conditioning, being overweight, not warming up sufficiently before training, poor and unsupportive footwear and history of a previous ankle injury. Another ankle injury is much more likely to occur after it has already been injured due to a sprain or strain. Additionally, women over the age of 30 and young men between the ages of 15 and 24 tend to be more at risk for ankle sprains. Activities and sports carried out on uneven terrain or involving pivoting on the spot or side-to-side movement may also increase a person’s risk for injury at the ankle.
-
Treatment
Healing after an ankle sprain can be lengthy as ligaments have little to no blood supply and knowing if ankle pain is a result of a sprain or strain is imperative for proper treatment and avoiding re-injury. Mild ankle sprains and strains can be treated at home with R.I.C.E, the age old application of rest, ice, compression and elevation. Ankle joint instability is common after injury. Ankle braces and taping can be effective for increasing stability, as are custom foot orthotics and appropriate footwear. Stretching and strengthening exercises will help to support and stabilise the weakened ankle joint. More severe injuries may also require immobilisation of the joint with traditional plaster casts or an air cast/boot. Surgery to repair the injured structures is only required if the first-line of treatment and rehabilitation is ineffective.
