We measured treatment responses for patients with primary coracoid impingement syndrome to determine whether coracoplasty provided pain relief and improved function. Eleven patients (12 shoulders) were included in the primary group, and secondary cases were excluded. Symptoms included burning pain occurring at the site of the coracoid process aggravated by exercise (push-ups). Magnetic resonance imaging and computed tomography showed a narrow coracohumeral interval. Surgical findings confirmed the diagnosis. Follow-up averaged 2.7 years. After follow-up, coracoplasty responses showed significant relief of pain (P < 0.0001) and improved function (P = 0.006). Treatment responses were good in primary cases, as indicated by pain and function scores.