Progressive diaphyseal dysplasia is a rare osteosclerotic dysplasia of
the bone which presents clinically with bone pain, muscle weakness an
d a waddling gait, Radiography, which shows progressive hyperostosis a
long the long bones forms the basis of the diagnosis. We present a you
ng patient in whom pain and limitation of movement in the shoulder joi
nt area, mimicking capsulitis, were the presenting symptoms of the dis
ease. The diagnostic and the therapeutic approach to this unusual diso
rder are discussed.