• Sang Gyun Kim, Kwang Seok Shim, Dong Won Lee, Eun Ju Kim, Sang-Gon Lee, Ji-Hyang Lee, and Ji Hyun An.
• Department of Anesthesiology and Pain Medicine, Daegu Fatima Hospital, Daegu, Korea.
• Medicine (Baltimore). 2017 Sep 1; 96 (39): e8135.

RationaleAlthough trigger point injection is known as an easy and low-risk procedure, it is contraindicated to patients with hemorrhagic disorders or who regularly take anticoagulants/antiplatelets. However, taking clopidogrel is not a defined contraindication to this low-risk procedure.Patient ConcernsThe chief complaint of a 76-year old woman regularly taking clopidogrel was low back and left buttock pain which prolonged for several years.DiagnosesThe patient was diagnosed with L4-5 and L5-S1 spinal stenosis at the orthopedics department and was referred for lumbar spinal epidural steroid injection.InterventionShe was treated with trigger point injection.OutcomesThree hours after the injection, she complained motor weakness and pain in the injection area. A hematoma on left gluteus medium muscle was detected with ultrasonography and ultrasound-guided needle aspiration was accomplished to relieve the symptom.LessonsTrigger point injection for patients taking clopidogrel should be done with a caution to prevent such complication.

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