<s>[INST] there is a knot right below my shoulderblades on the right side of my spine it feels like a hard ball a little smaller than a marble. I ve had back pain after i jarred my back about a year ago and its caused. pain near the said area. ever since. the jarring. what could it be [/INST] Hi, thank you for providing the brief history of you. A thorough clinical examination is advised. As you have pain under the shoulder blade, it looks more of a muscle spasm and posture correction. Due to abnormal posture there will be a possibility of inter scapular muscle spasm leading to knots. Treatment:Physical therapy in my clinical practice has been helpful to many of patients. Physical therapy includes - therapeutic ultrasound therapy, TENS therapy and exercises. Regards Jay In Chat Doctor.  </s>