Abstract
We presented a case in which massive hydroxyapatite accumulation was observed around the artificial hip joint. A 66-year-old female showed a massive accumulation of fluid in and around the hip joint, and milk-like aspirate was obtained. Her aspirate culture was negative, and sediment analysis by X-ray diffraction showed that its component was hydroxyapatite. Since pain was mild, the patient was treated conservatively. To our knowledge, this is the first case in which liquid hydroxyapatite (milk of calcium) was accumulated around the artificial hip joint.
Highlights
Hydroxyapatite crystal deposition disease (HADD) is characterized by deposition of crystal of hydroxyapatite (HA) in and around the joints [1, 2]
HA crystal is most frequently observed around the shoulder joint, and it is usually deposited in the soft tissue or bursa around the joints [1,2,3,4]
A case in which a massive milk-like fluid was accumulated in the articular cavity and in the bursa around the prosthesis after total hip arthroplasty (THA), and HA crystal could be identified by Xray diffraction analysis (XRD), was presented
Summary
Hydroxyapatite crystal deposition disease (HADD) is characterized by deposition of crystal of hydroxyapatite (HA) in and around the joints [1, 2]. It is known that HA crystal induces arthritis and periarthritis, but its mechanism has not been clarified yet. HA crystal is most frequently observed around the shoulder joint, and it is usually deposited in the soft tissue or bursa around the joints [1,2,3,4]. A case in which a massive milk-like fluid was accumulated in the articular cavity and in the bursa around the prosthesis after total hip arthroplasty (THA), and HA crystal could be identified by Xray diffraction analysis (XRD), was presented
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