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Introduction  Pachydermoperiostosis is a rare, hereditary disease commonly presenting with digital clubbing, pachydermia and periosteal hypertrophy. Therapeutic options for pachydermoperiostosis are few because of the unknown pathogenesis. Here, we report the complicated case of a patient with pachydermoperiostosis combined with spondyloarthritides, who was refractory to steroids and tumor necrosis factor alpha antagonists. We treated this patient with zoledronic acid and performed an arthroscopic synovectomy, with a satisfactory outcome. To the best of our knowledge, this is the first report in English on the combination of zoledronic acid administration and synovectomy for the treatment of a patient with pachydermoperiostosis and spondyloarthritides.    Case presentation  An 18-year-old Han Chinese man was diagnosed with pachydermoperiostosis in the presence of digital clubbing, periostitis and swollen limbs. Combined spondyloarthritides was also considered based on his lower back pain, lower limbs synovitis, bilateral sacroiliac sclerosis and a positive test for human leukocyte antigen B27, as well as immunoglobulin A nephropathy. He was refractory to steroids and tumor necrosis factor alpha antagonists, but treated with intravenous zoledronic acid and an arthroscopic synovectomy, with a satisfactory outcome.    Conclusion  This is a rare, complicated case of pachydermoperiostosis with spondyloarthritides. Combination therapy of zoledronic acid administration with synovectomy is a novel, convenient and effective option for patients with pachydermoperiostosis with remarkable synovitis.

A complicated case of pachydermoperiostosis with spondyloarthritides: a case report