Detecting Presence of Tarsal Tunnel Syndrome in Type II Diabetic Patients using Clinical, Radiological and Electrodiagnostic Studies: A Cross-sectional Study

Abstract

Introduction: Diabetic foot is one of the most devastating complications of diabetes and is the leading cause of lower limb amputations. Patients with a long-standing history of diabetes mellitus often experience symptoms of pain, burning sensation, numbness, and paraesthesia in the heel and feet. These symptoms may be due to compression of the medial plantar nerve, a branch of the tibial nerve, within the tarsal tunnel. Aim: To evaluate the incidence of Tarsal Tunnel Syndrome (TTS) in patients suffering from Type 2 Diabetes Mellitus (T2DM). Materials and Methods: This study was a cross-sectional analysis conducted at the Army Hospital (Research and Referral) in New Delhi, India, from October 2019 to April 2021. A total of 30 consecutive diabetic patients presenting with pain, burning, numbness, and paraesthesia in the heel or feet, with or without ulcers, were included. All patients were clinically evaluated using three-point sensory testing, Tinel’s sign at the tarsal tunnel, and assessment for the presence of ulcers on the foot. All patients underwent Nerve Conduction Velocity (NCV) studies. Imaging studies in the form of Magnetic Resonance Imaging (MRI) were performed for a complete work-up of these patients and further diagnosis of TTS. The incidence of TTS was evaluated using clinical, radiological and electrodiagnostic studies. Results: Of the 30 patients enrolled, 20 were males (66.7%) and 10 were females (33.3%). The incidence of TTS among diabetic patients was found to be 14 (46.7%) based on electrodiagnostic criteria, 22 (73.3%) based on clinical evaluation, and 25 (83.3%) based on radiological findings. The mean HbA1c level was 8.5±1.04%. The most common imaging finding was oedema, observed in 83.3% of patients. Inflammation and ganglion cysts were seen in 13.3% and 10% of patients, respectively. Conclusion: TTS is difficult to diagnose. MRI is a useful imaging modality to support the diagnosis. Electrodiagnostic studies can help confirm the diagnosis.

Keywords

• diabetic neuropathy
• electrodiagnostic study
• entrapment neuropathy
• magnetic resonance imaging