Unveiling a Hidden Culprit in Hip Pain: Hydroxyapatite Deposition Disorder in the Gluteus Medius Tendon

Abstract

Hydroxyapatite deposition disorder (HADD) is a spectrum of conditions that can manifest as calcific tendinitis, peri-articular hydroxyapatite deposition, and hydroxyapatite-induced arthritis, often presenting diagnostic challenges due to its rare occurrence and non-specific symptoms.  We report on an unusual case of HADD located in the gluteus medius tendon, highlighting the complexities encountered in diagnosis and the effective management strategies employed. Through a meticulous review of the patient's clinical presentation, imaging findings, and treatment response, we underscore the necessity of considering HADD in differential diagnoses for hip and other joint pain, especially in atypical locations. We propose a diagnostic pathway for HADD in the differential diagnosis for patients presenting with hip pain, and reinforce the importance of a multidisciplinary approach in managing such complex cases.