In the light of personal experience, the study refers to subtalar arthropathies subdivided into inflammatory, osteodystrophic, neoplastic and degenerative forms. The septic and those generally referred to as rheumatic (rheumatoid arthritis and psoriasis) are inflammatory diseases. Paget's disease is classified among the osteodystrophic forms, while villous-nodular pigmented synovitis and mucous cysts form part of the neoplastic forms.