Bony lumps appear in the growth zones of the long bones. These growths vary in size and number among affected individuals, even within the same family. Some individuals will present with a few large “lumps” while others will show several small growths.
In my father's family with six children just two were severely affected, one very minor and three with almost nothing.
If the exostoses are small, they may have little or no effect on the patient. However, in more severe cases, the growths may cause deformities of the forearm, knees, ankles, spine and/or pelvis. They may impose upon nerves, tendons and/or blood vessels, and interfere with movement or circulation, causing substantial pain as a result of pinched nerves or compressed tendons.
Bones that develop exostoses most often are the upper arm (humerus), forearm, knee and shoulder blades (scapulae). Bowing of the forearm and ankle are the problems that most often require surgical correction.
Some have mild short stature as a result of shortened and/or bowed legs.
The bony growths that characterize this disorder continue to grow until shortly after puberty at which time normally new growth no longer develops.
Pain and numbness are the most limiting in the life. I almost always have this feeling on my shoulder and pelvis and sometimes the knee. If I could get rid of them that would be nice