Outcomes Following Surgery for Common Peroneal Nerve Intraneural Ganglion Cysts: A Case Series and Systematic Review

Background

Intraneural ganglia are a rare cause of common peroneal nerve palsy. Although several treatment modalities exist, surgical intervention is recommended, especially in the setting of neurological dysfunction. We present a case series and systematic review on the clinical outcomes following surgical excision of common peroneal nerve intraneural ganglia.

Methods

We performed a retrospective chart review of all patients who had undergone surgery for common peroneal nerve intraneural ganglia at Queen Elizabeth Hospital in Birmingham, UK, from 2012 to 2022. Demographic and pre- and postoperative findings were collected. A comprehensive literature search of MEDLINE and EMBASE databases was also performed to identify similar studies. Data were subsequently extracted from included studies and qualitatively analyzed.

Results

Five patients at our center underwent procedures to excise intraneural ganglia. There was a male preponderance. Pain, foot drop, and local swelling were the common presenting features. Postoperatively, all patients who completed follow-up demonstrated improved motor function with no documented cyst recurrence. The systematic review identified 6 studies involving 128 patients with intraneural ganglia treated with surgery. Similar findings were reported, with objective and subjective measures of foot and ankle function and symptoms improving after surgical intervention. The recurrence rate varied from 0% to 25%, although most recurrences were extraneural.

Conclusions

Excision of intraneural ganglia is associated with symptomatic relief and functional improvement. Recurrence rates are relatively low and are rarely intraneural.

Effects of Ankle-Foot Orthosis on Balance of Foot Drop Patients

Ankle-Foot Orthoses (AFOs) are common non-surgical treatments used to support foot and ankle joint when their normal functioning is compromised. AFOs have relevant impact on gait biomechanics, while scientific literature about effects on static balance is less strong and confusing. This study aims to assess the effectiveness of a plastic semi-rigid AFO in improving static balance on foot drop patients. Results underline that no significant effects on static balance is obtained on the study population when the AFO is used on the impaired foot.

Reliability of IMU-Derived Gait Parameters in Foot Drop Patients

Foot drop is a deficit in foot dorsiflexion causing difficulties in walking. Passive ankle-foot orthoses are external devices used to support the drop foot improving gait functions. Foot drop deficits and therapeutic effects of AFO can be highlighted using gait analysis. This study reports values of the major spatiotemporal gait parameters assessed using wearable inertial sensors on a group of 25 subjects suffering from unilateral foot drop. Collected data were used to assess the test-retest reliability by means of Intraclass Correlation Coefficient and Minimum Detectable Change. Excellent test-retest reliability was found for all the parameters in all walking conditions. The analysis of Minimum Detectable Change identified the gait phases duration and the cadence as the most appropriate parameters to detect changes or improvements in subject gait after rehabilitation or specific treatment.

Incidence, Etiology, and Risk Factors Associated with Foot Drop

Background

Injury to the neurological pathway that enables ankle dorsiflexion is likely to cause foot drop. This pathway includes the motor cortex; lumbosacral plexus; and the sciatic, tibial, and peroneal nerves. Nerve damage typically occurs due to compression, entrapment, traction, or direct trauma to the nerve due to several etiologies. However, there are limited reports on the incidence, etiology, and factors associated with foot drop.

Methods

The authors reviewed their clinic's data from 1022 patients with foot drop from 2004 to present to determine the incidence, causes, and risk factors of foot drop. Microsoft Excel was used for descriptive statistical data analysis and graphing.

Results

A total of 21 causes of foot drop were found. Of 1022 patients, 142 (13.9%) had foot drop after lumbosacral (LS) spine surgery, while 131 patients (12.8%) with LS spine complications who had not undergone surgery also reported foot drop. The LS spine complications and surgeries were influenced by age (median age, 63 and 55 years, respectively) and were marginally higher in male patients (54%). A total of 79 patients (7.8%) with foot drop had previously undergone hip replacement surgery. Older age (median age, 60 years) and female sex (85%) were risk factors for hip replacement surgery resulting in foot drop. In contrast, younger age and male sex were the risk factors for gunshot and stab wounds, injection drug use, drug or medication overdoses, and motor vehicle accidents resulting in foot drop.

Conclusions

Failed back surgery syndrome is the leading cause of foot drop after lumbosacral spine and hip replacement surgeries in both male and female older (median age, 60 years) patients. However, most (85%) of the foot drop patients in the present study who underwent hip replacement surgery were female patients. Sports and recreational activities, motor vehicle accidents, drug use, and violence are common causes of foot drop in younger male adults.

Case Report (Precis): Two Telemedicine Consultants Miss Foot Drop: When To See Patients in Person

Background

Telemedicine has been rapidly adopted due to COVID-19. In the earliest days, most screenings were performed by primary care/internal medicine consultants; referrals to subspecialists were minimized. Now, as the pandemic has evolved over 6 months, secondary telemedicine consultations should be limited, and earlier involvement of appropriate subspecialists should be reconsidered to optimize patient management.

Case Description

An older individual spoke to an on-call general medical physician with the chief complaint of the acute onset of low back pain after moderately strenuous activity, with severe unilateral radiculopathy. The telemedicine physician recommended a non-steroidal. anti-inflammatory agent without any specific recommendations regarding follow-up. A few days later, with progression of unilateral pain and numbness, a second telemedicine medical consultation was performed; a Medrol dose pack and muscle relaxant were now recommended, again without any follow-up recommendations. Days later, with increased unilateral pain/ near anesthesia in the foot, the patient was seen by a spinal surgeon who found; unilateral SLR positive at 20 degrees, a 0/5 foot drop, loss of the Achilles Response, and decreased pin appreciation in the L5 distribution. The patient's emergent lumbar MR showed a large unilateral disc herniation with inferior migration at the appropriate level, warranting surgical consideration.

Conclusion

Here, we emphasized several points. First, telemedicine may be adequate for the initial screening, but further complaints would be better evaluated in person by either a medical or surgical subspecialist; here, both could have recognized the very clear unilateral foot drop. Second, the patient should have had a scheduled follow-up in-person consultation. Third, appropriate diagnostic studies should have been ordered at the time of the second telemedicine consultation to establish the correct diagnosis and direct treatment.

Dual lumbar bronchogenic and arachnoid cyst presenting with sciatica and left foot drop

INTRODUCTION

Spinal bronchogenic cysts are rare findings, with only four cases of lumbar bronchogenic cysts reported in the literature. All of these bronchogenic cysts involved the conus medullaris. We present the first case of a lumbar bronchogenic cyst and arachnoid cyst arising from the cauda equina in a 68-year-old male. Uniquely, this bronchogenic cyst also contained components of an arachnoid cyst.

METHODS

Magnetic resonance imaging (MRI) demonstrated a compressive cystic lesion at the level of the L3 vertebra splaying the cauda equina. An L3/L4 laminectomy was performed with marsupialisation of the cyst.

RESULTS

Histological examination revealed pseudostratified ciliated columnar epithelium confirming the diagnosis of a bronchogenic cyst, as well as a pleated fibrovascular tissue lined by sparsely spaced small monomorphic arachnoidal cells, indicating an arachnoid cyst.

CONCLUSION

We demonstrate that bronchogenic cysts can be successfully treated with marsupialisation.