Osteokondroma a benign tumor on the spine of the most common and manifests as a
solitary non - hereditary exostosis is the long bone metaphysis in the majority of cases.
Pain, impaired joint motion, tendon inflammation, as well as the compression of blood
vessels and peripheral nerves is a complication caused by osteokondroma. Deformity is
a frequent complication reported in osteokondroma that the bones of the lower arm
(forearm). This report discusses the distal ulna osteokondroma on a male patient aged 7
years with shortening deformity of the ulna ( ulnar shortening ) according to the
classification of type I. Masada Surgery ( excision of the tumor ) is the primary
treatment option in this case . Forearm deformity subsequently corrected through the
installation procedure with the ulnar lengthening plate fixation. Correction of the
deformity provides improved cosmetic appearance of the forearm after surgery in these
patients.