LAUSR

A 55-year-old male patient applied to our clinic with low back pain and intermittent dysesthesia in the left buttock for the last 2 months. He declared that the “burning” sensation and pain had become worse after playing tennis. He denied any sports trauma and added that oral anti-inflammatory drugs and local massage had been partially effective. Physical examination revealed intense pain provoked by palpation on the posterior iliac crest only on the left side. Active range of motion of the lumbar spine was painful during lateral flexion and a straight leg raise test was negative. Based on the clinical findings, the patient was suspected to have superior cluneal nerve (SCN) entrapment due to excessive training and repetitive torsional movements of the trunk. Before a local injection, ultrasound (US) examination was planned to correctly identify the infiltration sites and to avoid complications (Özçakar et al., 2016). US imaging of the posterior iliac crest was performed with a high frequency linear probe in order to correctly localized the SCN (Chang et al., 2017a). The probe was positioned (in the transverse plane) on the posterior aspect of the iliac crest using the anterosuperior gluteal line as the bony landmark (Fig. 1). Of note, it is a bony salience that divides gluteus medius and gluteus minimus muscles on the lateral aspect of the hip. Comparative scanning was unremarkable (Fig. 1).