Ankle Instability — When the Ankle Keeps Rolling
Table of Contents
What is Chronic Ankle Instability (CAI)?
When more than six months have passed since an ankle sprain but the same ankle keeps rolling or you continue to feel uneasy walking on uneven ground, it is called Chronic Ankle Instability. About 40% of initial sprain patients progress to this state, and without proper rehabilitation, repeated sprains lead to early degenerative changes of the ankle joint.
Mechanical vs. functional instability
- Mechanical instability: The anterior talofibular ligament (ATFL) or calcaneofibular ligament (CFL) heals in a lax state, leaving the joint structurally unstable. Increased laxity is detected on the anterior drawer test.
- Functional instability: The ligaments have healed relatively well, but proprioception and reflexive muscle contraction responses are reduced, causing a sense of instability. Wobble increases on single-leg stance.
The importance of proprioception
Proprioception is the sensory system that conveys joint position and movement to the brain. When ligaments are injured, the mechanoreceptors within them are also damaged, slowing the protective reflex contraction of the peroneal muscles when the ankle starts to roll. This is the core reason why the same ankle is sprained repeatedly.
Korean medicine stabilization treatment
- Acupuncture and electroacupuncture: Needling motor points of the peroneal muscles (peroneus longus and brevis) and applying electroacupuncture stimulation to shorten neuromuscular reaction time.
- Chuna manipulation: Correct the position of the talus, which is subluxed in inversion, and check the alignment of the distal tibiofibular syndesmosis.
- Pharmacopuncture: Proliferation pharmacopuncture is delivered to lax ligament attachments to encourage strengthening of connective tissue.
- Herbal medicine: Liver- and kidney-tonifying prescriptions (Yukmijihwang-tang plus Achyranthis Radix, Dipsaci Radix, Eucommiae Cortex) support structural recovery of ligaments and tendons.
Balance board training and taping
Systematically retrain proprioception by progressing from single-leg stance on a balance board, to standing with eyes closed, to playing catch — gradually increasing difficulty. Wearing ankle taping or a functional lace-up brace during exercise prevents recurrent sprains and helps restore confidence.