Tibial Nerve Injury: Causes, Symptoms, and Acupuncture Treatment Options

The tibial nerve is a branch of the sciatic nerve. Its motor fibers innervate the muscles of the posterior leg and the sole of the foot, enabling plantar flexion of the foot and toes; its sensory fibers distribute to the sole of the foot and the lateral aspect of the dorsum of the foot. When the tibial nerve is injured, the foot and toes cannot flex, the patient cannot stand on the toes or jump, and there is sensory disturbance on the sole and lateral dorsum of the foot.

The causes of tibial nerve injury are numerous. Common etiologies include: penetrating wounds near the knee joint, such as stab wounds, gunshot wounds, popliteal cysts, compression by tumors, or irritation from surgical trauma; injuries, compression, or irritation from fractures of the upper tibia or dislocations; intense sports activities or trauma involving the L5 and S2 nerve plexus; as well as diabetes mellitus, polyarteritis nodosa, spontaneous interstitial neuritis of the tibial nerve, and leprosy. All of these can directly or indirectly lead to tibial nerve injury or paralysis. Clinically, traumatic causes are the most frequently encountered.

Key Diagnostic Points

Clinically, when the tibial nerve is completely paralyzed (due to injury at the popliteal region), a pronounced “claw foot” deformity appears: the distal phalanges of all toes, the middle phalanges of the 2nd–5th toes, and the proximal phalanx of the great toe cannot flex. Due to the antagonistic contraction of the peroneal and toe extensor muscles, the foot assumes a dorsiflexed position (calcaneus foot), resulting in a stamping gait. The proximal phalanges of the toes are extended while the middle and distal phalanges are flexed; this pattern is especially typical in the great toe. Abduction and adduction of the toes are markedly limited. Sensory loss occurs on the posterior aspect of the lower leg (medial sural cutaneous nerve distribution), the lateral border of the foot (dorsal lateral cutaneous nerve distribution), and the lateral aspect of the heel (lateral calcaneal branches).

Sensory disturbances occur in the lateral branch and medial calcaneal branch, as well as the plantar surface of the foot and toes (common plantar digital nerves of the 1st to 5th toes).

When the tibial nerve is injured distal to its branches to the gastrocnemius and flexor digitorum longus muscles, paralysis of these muscles does not occur. Instead, only the small muscles of the plantar region are affected, accompanied by sensory disturbance in the plantar region (medial plantar nerve territory).

Partial injury of the tibial nerve may sometimes present with causalgic pain. The pain is located in the posterior aspect of the lower leg and radiates to the middle of the plantar region of the foot. The intensity of the pain varies; severe cases may radiate to the entire lower limb, often accompanied by vasomotor, sweating, and trophic disturbances.

【Treatment】

I. Acupoints and Needling Techniques

1. BL40 (Weizhong) (affected side): Located at the midpoint of the popliteal crease, between the tendons of the biceps femoris and semitendinosus muscles. A 30-gauge, 2-cun filiform needle is used. After routine local disinfection, insert obliquely and slightly upward toward the medial border of the femur. Needle sensation: local distension and pain, or radiation to the lower leg and plantar aspect of the foot.

2. **BL57 (Chengshan)** (affected side): Located at the midpoint of the inverted “V” pattern formed by the gastrocnemius muscle bellies when the leg is extended, inferior to the belly of the gastrocnemius muscle. Using a 30-gauge, 2-cun filiform needle, after routine local disinfection, insert perpendicularly to a depth of approximately 1.8 cun. Needling sensation: local distension and pain.

3. SP6 (Sanyinjiao) (affected side): Located 3 cun above the medial malleolus, on the posterior border of the medial tibial surface. Use a 30-gauge, 2-cun filiform needle. After routine local disinfection, insert approximately 1.8 cun obliquely toward the contralateral GB39 (Xuanzhong). Needle sensation: local distension and pain.

4. **Bafeng (EX-LE10) points (4 points on the affected side):** Located on the dorsum of the foot, at the junction of the red and white skin in each of the four interdigital webs. Use four 30-gauge, 1.5 cun filiform needles. After routine local disinfection, insert each point obliquely upward to a depth of approximately 1.3 cun. Needling sensation: local distension and pain.

2. Methods

The patient takes a seated position. The aforementioned points are needled according to the method with electroacupuncture. The needles are retained for 40 minutes and then removed. The treatment is given once daily, with 10 sessions constituting one course of treatment. A rest of 5 days is taken before the next course of needling.

【Commentary】

Patients with tibial nerve injury who present only with lower limb pain and numbness experience relatively rapid results with the above method, with pain largely relieved after about six sessions. If, after injury, the tibial nerve…

For cases of paralysis of short duration and without nerve rupture, the above method also yields very good therapeutic results with faster recovery. In patients with nerve rupture or longer duration, especially those presenting with muscle atrophy, the above method requires a longer treatment period. Nevertheless, with meticulous treatment and persistent exercise, satisfactory outcomes can still be achieved.

Etiology and Pathophysiology of Tibial Nerve Injury

The tibial nerve injury causes are diverse, typically arising from traumatic, compressive, or iatrogenic mechanisms. Given its anatomical course through the popliteal fossa and posterior leg, the nerve is vulnerable to fractures of the distal femur or proximal tibia, penetrating wounds, and crush injuries. Chronic entrapment may occur within the tarsal tunnel, a fibro‑osseous canal at the medial ankle, leading to tarsal tunnel syndrome. Systemic conditions such as diabetes mellitus or peripheral vascular disease can predispose to ischemic neuropathy. Additionally, prolonged positioning during surgery, inappropriate tourniquet use, or direct contusion from sports activities are recognized causes. The injury disrupts axonal transport and myelin integrity, resulting in loss of motor innervation to the posterior compartment muscles—including the gastrocnemius, soleus, and tibialis posterior—and sensory denervation of the plantar surface. Understanding these tibial nerve injury causes is crucial for early diagnosis and targeted intervention, as the degree of functional impairment correlates closely with the nature and severity of the insult.

Clinical Manifestations of Tibial Nerve Damage

The symptoms of tibial nerve damage reflect its dual motor and sensory roles. Patients typically present with weakness or inability to perform plantar flexion of the foot and toes, resulting in a characteristic “toe‑drop” gait. They cannot stand on tiptoes or push off during ambulation. Sensory disturbances manifest as numbness, paresthesia, or pain along the sole of the foot and the lateral aspect of the dorsum, often sparing the dorsum medially due to peroneal nerve distribution. In severe cases, loss of protective sensation may lead to unnoticed foot ulcers, especially in diabetic individuals. Tinel’s sign may be elicited over the tarsal tunnel or along the nerve course. Gait analysis reveals reduced push‑off phase and compensatory hip and knee movements. These symptoms of tibial nerve damage are distinct from those of common peroneal nerve lesions, aiding in clinical localization. Prompt recognition enables appropriate management to prevent chronic disability and deformities such as claw toes or fixed equinus contracture.

Management and Prognosis of Tibial Nerve Injury

Tibial nerve injury treatment options depend on injury severity and etiology. Conservative management includes rest, orthotics (e.g., ankle‑foot braces to maintain dorsiflexion), and physical therapy focusing on strengthening remaining plantar flexors and maintaining range of motion. Pharmacological agents such as NSAIDs, gabapentin, or tricyclic antidepressants may alleviate neuropathic pain. For traumatic lacerations or entrapment unresponsive to conservative care, surgical exploration with neurolysis, direct repair, or nerve grafting is indicated. Postoperative rehabilitation emphasizes gradual re‑education of motor function and sensory retraining. The tibial nerve injury recovery time is highly variable; mild compressive injuries may resolve within weeks, whereas severe axonotmesis or neurotmesis can require 6 to 24 months for reinnervation, with functional recovery often incomplete. Factors influencing prognosis include patient age, injury mechanism, timely intervention, and adherence to rehabilitation. Regular electromyography and nerve conduction studies help track regeneration. Coordinated multidisciplinary care optimizes outcomes, emphasizing that early diagnosis and appropriate tibial nerve injury treatment options significantly enhance long‑term prognosis.