Many people have experienced a sprained ankle (a "twisted ankle"). However, it's crucial to note that improper handling can turn it into a long-term problem, potentially worsening into Chronic Ankle Instability. This condition not only affects a patient's mobility but can also lead to the early onset of degenerative arthritis due to the long-term instability of the ankle joint.
Ankle sprains are one of the most common sports and daily musculoskeletal injuries, with inversion sprains (foot rolling inward, injuring the outer ligaments) being the most frequent. While most people recover with proper rest and treatment, if the initial sprain isn't properly treated and rehabilitated, or if repeated sprains occur, it can develop into Chronic Ankle Instability.
An ankle sprain can cause stretching or tearing of the ligaments and damage to the joint capsule structure, reducing the ankle's stability and creating a vicious cycle of "sprain → instability → re-sprain."
On the other hand, even without severe damage to ligaments or the joint capsule, a sprain can impair sensation in the lower limb and ankle joint, reduce muscle coordination and control, and decrease static and dynamic balance. This severely affects the ability to prevent another sprain during daily activities or sports, as the reaction time to correct joint displacement becomes too slow.
Consider the following clinical case: Miss Lam sprained her right ankle (inversion) about a year ago while wearing high heels and missing a step. She experienced obvious pain and swelling on the outer ankle with mild bruising. She only self-treated with ice and rest at home, without any formal rehabilitation. The swelling subsided after a few days, pain gradually improved, and she was walking normally within two weeks, believing she had fully recovered.
Three months ago, while hiking downhill, Miss Lam stepped on a loose rock and severely inverted her right ankle again. This time, the pain and swelling were much worse; she could barely walk and had to be assisted. A doctor diagnosed a tear in the outer ankle ligaments. After regular follow-ups and rehabilitation, her pain and swelling improved significantly within weeks, and she again felt she was "almost recovered."
However, in the following months, Miss Lam experienced two more minor sprains of the same ankle. She often felt her right ankle was "loose" and "weak," worrying about re-injury on uneven ground. Even walking on flat surfaces caused persistent pain and instability. She stopped wearing high heels and reduced her beloved hiking activities. Miss Lam's situation likely indicates the development of Chronic Ankle Instability.
If you experience the following symptoms, you should be cautious, as they may indicate a risk for Chronic Ankle Instability:
Patients may alter their walking gait due to fear of re-injury or pain, causing uneven weight distribution and other issues that affect daily activities and quality of life. Long-term instability can also lead to early degenerative arthritis.
Physical therapy for this condition typically includes:
According to the 2021 revised clinical practice guideline from the American Physical Therapy Association, core exercises to prevent recurrent sprains and chronic instability include proprioception, neuromuscular, and activity-specific training.
Here are two exercises that can be performed after the acute inflammation and pain from a lateral ankle sprain have subsided:
Early treatment after the initial sprain is key to avoiding Chronic Ankle Instability, repeated injuries, and long-term risks like cartilage wear and degenerative arthritis. If Chronic Ankle Instability develops, both surgical and non-surgical rehabilitation options are available. With consistent proprioception, neuromuscular, balance, and functional training, improvement can typically be seen within weeks to months, restoring ankle stability and confidence. If you are troubled by symptoms of chronic instability, seek professional medical assessment and guidance promptly.
