The Heterotopic Ossification is a biologic process in which new bone formed in tissues where it is not found normally, and it is a complication in 16% to 53% of Spinal Cord Injury(SCI) patients. The prophylaxis of H.O. for all SCI patients is phamacologic medication such as disordium etdronate, indometacin, acetylsalycilic acid, and exyphenbutazon, Radiotheraphy & ROM Ex.

The Charts of 75 randomly selected SCI patients, followed up above 1yr ago, were reviewed retrospectively to learn if criteria. Which would predict high risk patients could be identified.

A Total of 10 variables (Age, Sex, Completeness of lesion, level of lesion, cause of injury, muscle tonicity (spasticity or flaccid), pressure sore, UTI, S-ALP, site of H.O) were studied, Four of the 10 variables (Age, Completeness of lesion, presence of pressure sore & spasticity) were significantly related to H.O formation.

The risk factors appear to be additive. When the risk factor were present above 3 factors, 92% of patients were found to have all H.O.