The sprain that never fully healed
The patient sprained the ankle months ago. Used ice, rested, wore a brace. The swelling subsided, but the pain remained — a diffuse pain on the lateral side of the ankle that worsens when walking on uneven terrain, going down stairs, or trying to run. The ankle "doesn't feel the same as before." This is the story of a relevant share of patients who suffer ankle sprains: the ligamentous injury resolves, but the chronic residual pain persists.
What most rehabilitation protocols do not address are the trigger points that develop in the peroneal muscles (peroneus longus and brevis) as a protective response to the ligamentous injury. These trigger points generate referred pain on the lateral ankle and the dorsum of the foot, muscle spasm that limits mobility, and proprioceptive deficit that predisposes to new sprains. Dry needling of these trigger points, combined with proprioceptive rehabilitation, is frequently the missing piece for complete recovery.
Why pain persists after a sprain
Ligamentous injury and protective response
A lateral sprain damages the anterior talofibular ligament and, in more severe injuries, the calcaneofibular ligament. The peroneal muscles enter protective spasm to stabilize the ankle — this prolonged contraction develops trigger points that persist even after ligamentous healing.
Trigger points in the peroneals
The peroneus longus and peroneus brevis, located on the lateral side of the leg, develop trigger points that refer pain to the lateral ankle and dorsum of the foot. This referred pain is confused with the original ligamentous pain, leading to the erroneous diagnosis of a "sprain that did not heal".
Proprioceptive deficit
The ligamentous injury damages the mechanoreceptors that inform ankle position in space. Trigger points in the peroneals amplify this deficit, since the spasming muscle does not respond adequately to dynamic stabilization demands — creating a cycle of instability and new sprains.
Fibrosis and adhesions
Inadequate healing generates adhesions in the sinus tarsi and periarticular tissues. These adhesions limit dorsiflexion and inversion/eversion, altering gait biomechanics and overloading adjacent structures. Periarticular needling helps reorganize scar tissue.
Pain chronification
The combination of active trigger points, proprioceptive deficit, and adhesions keeps the ankle in a state of chronic pain and vulnerability. Without targeted treatment of each component, the patient enters a cycle of residual pain and recurrent sprains.
Chronic post-sprain pain in numbers
Signs of residual post-sprain pain
Clinical pattern of chronic post-sprain ankle pain
- 01
Diffuse lateral ankle pain months after the original sprain
- 02
Pain that worsens when walking on uneven or inclined terrain
- 03
Sensation of insecurity or "giving way" of the ankle
- 04
Morning stiffness that improves with movement
- 05
Lateral leg pain on palpation of the peroneal muscles
- 06
Limitation of ankle dorsiflexion compared with the opposite side
- 07
Difficulty balancing in single-leg stance on the affected side
Myths about chronic ankle sprain
Myth vs. Fact
An ankle sprain is a simple injury that always heals on its own
A lateral ankle sprain is the most common musculoskeletal injury, but far from "simple". Up to 40% of cases progress with chronic instability, residual pain, and recurrent sprains. Underestimation of severity and insufficient rehabilitation — which does not address trigger points in the peroneals and proprioceptive deficit — are the main factors of chronification.
An ankle brace solves chronic instability
A brace offers external mechanical support but does not correct the neuromuscular and proprioceptive deficits that cause instability. Prolonged use can further weaken the stabilizing musculature. Effective treatment combines deactivation of trigger points with dry needling and progressive proprioceptive rehabilitation to restore intrinsic stability.
If the MRI shows no injury, the ankle is fine
MRI may show healed ligaments without active injury — but it does not detect trigger points in the peroneals, proprioceptive deficit, or early-stage sinus tarsi syndrome. Clinical assessment with muscle palpation, stability tests, and proprioceptive evaluation is essential to identify the causes of residual pain that imaging does not reveal.
The forgotten muscles of the sprain
Treatment protocol
Assessment of instability and residual pain
1st visitAnterior drawer test and talar tilt to assess mechanical instability. Palpation of the peroneals to identify trigger points. Proprioceptive assessment with single-leg stance. Comparative dorsiflexion assessment. If significant mechanical instability, consider orthopedic evaluation.
Dry needling of the peroneals
Sessions 1–3Needling of trigger points in the peroneus longus and peroneus brevis on the lateral side of the leg. Twitch response is frequently intense in these muscles. Periarticular needling in the sinus tarsi region when deep lateral pain is present. 2 Hz electroacupuncture for local analgesia.
Proprioceptive rehabilitation
Sessions 3–5Progressive single-leg balance training: stable surface, balance board, eyes closed. Strengthening of ankle evertors with elastic resistance. Joint mobilization to gain dorsiflexion when limited by adhesions.
Functional return and prevention
Sessions 5–6Progressive return to sports activities with specific agility training. Proprioceptive maintenance program (5 minutes daily on a balance board). Guidance on early recognition of new episodes and when to seek reassessment.
Clinical pearl: the single-leg stance test
Frequently asked questions
Frequently Asked Questions
It is frequent, but should not be considered acceptable — it usually indicates that rehabilitation was incomplete. A significant share of patients with sprains develop chronic pain, generally from untreated trigger points in the peroneals and residual proprioceptive deficit. Treatment with dry needling combined with specific rehabilitation can improve symptoms in many cases, even months or years after the original sprain, although response varies individually.
Surgery is indicated for severe mechanical instability that does not respond to conservative treatment — not for isolated residual pain. Most patients with chronic post-sprain pain have a myofascial cause (trigger points in the peroneals) and proprioceptive cause that does not resolve with surgery. Adequate conservative treatment with medical acupuncture and rehabilitation should be exhausted before considering surgical intervention.
Yes, the goal is complete return to activity. After deactivation of trigger points and proprioceptive rehabilitation, running is reintroduced progressively — first on flat surface, then on uneven terrain. The physician monitors recovery markers (single-leg stance with eyes closed, symmetric dorsiflexion) to clear each phase of return.
Intensive training is done in the first 8–12 weeks. After reaching functional stability equivalent to the healthy side, maintenance with 5 minutes daily on a balance board is sufficient to preserve gains. This minimal investment significantly reduces the risk of a new sprain.