Eleven patients were seen with reactive sclerosis and hypertrophy of one
pedicle and lamina of a lumbar vertebra and a contralateral spondylolysis
in the same vertebral segment. Differentiating the reactive sclerosis in
this condition from that associated with osteoid-osteoma is necessary since
excision of a sclerotic pedicle associated with contralateral spondylolysis
will create painful instability. In asymptomatic patients observation is
sufficient, while in those with symptoms not relieved by external
immobilization, spine fusion, usually of three levels, is indicated.