No abstract available.
Cyclosporine ; Peroneal Neuropathies

Foot drop is usually derived from peroneal nerve injury. Traumatic causes of peroneal nerve injury are more common than insidious causes including metabolic syndromes and mass lesions. We present a case with common peroneal neuropathy due to schwannoma, which is extremely rare. Complete excision of the mass lead to a gradual improvement of the symptoms. Schwannoma should be considered as a cause of common peroneal neuropathy.
Foot* ; Neurilemmoma* ; Paralysis ; Peroneal Nerve* ; Peroneal Neuropathies

We report a case of peroneal neuropathy after a 40 year-old woman underwent laparoscopic myomectomy in the lithotomy position. Postoperatively, the patient complained of pain and tingling sensation in the left leg and dorsum of the left foot. A neurologic examination revealed paresthesia in the distribution of the superficial and the deep peroneal nerves of the left leg. After six days of medical and physical treatment with a diagnosis of common peroneal neuropathy, the symptoms were much improved. On the 19th postoperative day, nerve conduction and electromyographic studies were performed, which revealed nearly complete recovery from the superficial peroneal neuropathy distal to the fibular head.
Female ; Foot ; Humans ; Leg ; Neural Conduction ; Neurologic Examination ; Paresthesia ; Peroneal Nerve ; Peroneal Neuropathies ; Sensation

Intermittent pneumatic compression device is a standard component for prevention of deep venous thrombosis in immobile patients. This method has been known to be safe with very low rate of complications compared to medical thromboprophylaxis. Therefore, this modality has been used widely in patients who underwent a general surgery. We report a patient who developed common peroneal nerve palsy during the use of intermittent pneumatic compression device after Hartmann's operation.
Humans ; Intermittent Pneumatic Compression Devices ; Paralysis ; Peroneal Nerve ; Peroneal Neuropathies ; Postoperative Complications ; Venous Thrombosis

Schwannomas are benign nerve sheath tumors that can present in various locations and they have variable symptoms. However, schwannoma of the superficial peroneal nerve is rare, and only a limited number of cases have been reported. The authors here describe a case of schwannoma of the superficial peroneal nerve, which was initially considered as a L5 radiculopathy because of its clinical similarity. In the differential diagnosis of nontraumatic and nonarthritic pain of the lower leg and foot, benign tumors, particularly schwannomas of the peroneal nerves should be considered. Treatment by excision can result in relief of the symptoms and maintenance of function.
Diagnosis, Differential ; Foot ; Leg ; Nerve Sheath Neoplasms ; Neurilemmoma* ; Peroneal Nerve* ; Peroneal Neuropathies ; Radiculopathy ; Sciatica*

OBJECTIVE: To establish the diagnostic cutoff value of ultrasonographic measurement for common fibular neuropathy (CFN) at the fibular head (FH). METHODS: Twenty patients with electrodiagnostically diagnosed CFN at the FH and 30 healthy controls were included in the study. The cross-sectional area (CSA) of sciatic nerve at mid-thigh level, common fibular nerve at popliteal fossa (PF), and common fibular (CF) nerve at FH were measured. Additionally, the difference of CF nerve CSA at the FH between symptomatic side and asymptomatic side (ΔSx–Asx), the ratio of CF nerve CSA at FH to at PF (FH/PF), and the ratio of CF nerve CSA at the FH symptomatic side to asymptomatic side (Ratio Sx–Asx) were calculated. RESULTS: CSA at the FH, FH/PF, ΔSx–Asx, and Ratio Sx–Asx showed significant differences between the patient and control groups. The cutoff value for diagnosing CFN at the FH was 11.7 mm² for the CSA at the FH (sensitivity 85.0%, specificity 90.0%), 1.70 mm² for the ΔSx–Asx (sensitivity 83.3%, specificity 97.0%), 1.11 for the FH/PF (sensitivity 47.1%, specificity 93.3%), and 1.24 for the Ratio Sx–Asx (sensitivity 72.2%, specificity 96.7%). CONCLUSION: The ultrasonographic measurement and cutoff value could be a valuable reference in diagnosing CFN at the FH and improving diagnostic reliability and efficacy.
Head* ; Humans ; Peroneal Nerve ; Peroneal Neuropathies* ; Sciatic Nerve ; Sensitivity and Specificity ; Ultrasonography*

To enhance the accuracy for determining the precise localization, the findings of the compound nerve action potentials (CNAPs) of the common peroneal nerve (CPN) were investigated in patients with common peroneal mononeuropathy (CPM) in the knee, and the sural sensory nerve action potentials (SNAPs) were also analyzed. Twenty-five patients with CPM in the knee were retrospectively reviewed. The findings of the CNAPs of the CPN recorded at the fibular neck and the sural SNAPs were analyzed. The lesion was localized at the fibular head (abnormal CNAPs) and at or distal to the fibular head (normal CNAPs). Seven patients were diagnosed as having a lesion at or distal to the fibular neck, and 18 cases were diagnosed as having a fibular head lesion. The sural SNAPs were normal in all the cases of lesion at or distal to the fibular neck. Among 18 cases of fibular head lesion, the sural SNAPs were normal in 7 patients: two cases of conduction block and 5 cases of mild axon loss. Eleven patients showed abnormal sural SNAPs. Of those, 9 cases were severe axon loss lesions and 2 patients were diagnosed as having severe axon loss with conduction block. The recording of the CNAPs may enhance precise localization of CPM in the knee. Moreover, the sural SNAPs could be affected by severe axonal lesion at the fibular head.
Action Potentials ; Humans ; Peroneal Nerve/*physiopathology ; Peroneal Neuropathies/*physiopathology ; Sural Nerve/*physiopathology

Innervation anomalies are well-known sources of erroneous interpretation in motor nerve conduction studies. The extensor digitorum brevis (EDB) muscle is supplied by the deep peroneal nerve and is commonly used as recording point in peroneal motor conduction study. If the compound muscle action potentials (CMAPs) are not evoked with EDB muscle recording without any symptoms or signs of peroneal neuropathy, we should lead one to consider either technical pitfall or anomalous innervation. We experienced an anomalous innervation in a woman in whom the bilateral EDB muscles were innervated exclusively by the tibial nerve. This was proved using a monopolar needle electrode for recording in extensor digitorum brevis (EDB) and flexor digitorum brevis (FDB) muscles, which encoded acceptable shape of CMAPs on tibial nerve stimulation. To avoid erroneous interpretation of electromyographic and nerve conduction studies, one should be aware of this possible innervation anomaly ("all tibial foot").
Action Potentials ; Electrodes ; Female ; Humans ; Muscles ; Needles ; Neural Conduction ; Peroneal Nerve ; Peroneal Neuropathies ; Tibial Nerve*

OBJECTIVE: To analyze the incidence and characteristics of fabella in the Chinese population and its correlation with pain in the posterolateral region of the knee joint and common peroneal nerve palsy. METHODS: Total 732 patients including 405 males(450 knees) and 327 females(383 knees) who underwent unilateral or bilateral knee MR imaging from September 2015 to July 2019 were retrospectively evaluated. The basic information of all patients was extracted from the hospital's his system. The patient's medical records were checked by telephone follow-up or his system, and the number of patients with posterolateral knee pain and common peroneal nerve paralysis were recorded. RESULTS: The overall prevalence of fabella was 48.38%, 23.53% in men and 24.85% in women, there was no significant difference between them ( CONCLUSION The prevalence of fabella us in Chinese population is 48.38%. There is no relationship between the incidence of gastrocnemius and gender, but the incidence of fabella is positively correlated with age, pain in the posterolateral region of the knee joint and the occurrence of common peroneal nerve symptoms.
Adult ; Female ; Humans ; Knee Joint ; Male ; Middle Aged ; Pain ; Peroneal Nerve ; Peroneal Neuropathies/epidemiology* ; Retrospective Studies ; Young Adult

OBJECTIVE: In Asians, kneeling and squatting are the postures that are most often induce common peroneal neuropathy. However, we could not identify a compatible compression site of the common peroneal nerve (CPN) during hyper-flexion of knees. To evaluate the course of the CPN at the popliteal area related with compressive neuropathy using magnetic resonance imaging (MRI) scans of healthy Koreans.METHODS: 1.5-Tesla knee MRI scans were obtained from enrolled patients and were retrospectively reviewed. The normal populations were divided into two groups according to the anatomical course of the CPN. Type I included subjects with the CPN situated superficial to the lateral gastocnemius muscle (LGCM). Type II included subjects with the CPN between the short head of biceps femoris muscle (SHBFM) and the LGCM. We calculated the thickness of the SHBFM and posterior elongation of this muscle, and the LGCM at the level of femoral condyles. In type II, the length of popliteal tunnel where the CPN passes was measured.RESULTS: The 93 normal subjects were included in this study. The CPN passed through the “popliteal tunnel” formed between the SHBFM and the LGCM in 36 subjects (38.7% type II). The thicknesses of SHBFM and posterior portions of this muscle were statistically significantly increased in type II subjects. The LGCM thickness was comparable in both groups. In 78.8% of the “popliteal tunnel”, a length of 21 mm to < 40 mm was measured.CONCLUSION: In Korean population, the course of the CPN through the “popliteal tunnel” was about 40%, which is higher than the Western results. This anatomical characteristic may be helpful for understanding the mechanism of the CPNe by posture.
Asian Continental Ancestry Group ; Head ; Humans ; Knee ; Magnetic Resonance Imaging ; Nerve Compression Syndromes ; Peroneal Nerve ; Peroneal Neuropathies ; Posture ; Retrospective Studies