A, Oblique: fracture at oblique angle across bothcortices. Cause: Direct or indirect energy, withangulation and some compression. B, Occult:Fracture that is hidden or not readily discernible.Cause: Minor force or energy. C, Open: Skinbroken over fracture; possible soft tissue trauma.Cause: Moderate to severe energy that iscontinuous and exceeds tissue tolerances. D,Pathologic: transverse, oblique, or spiral fractureof bone weakened by tumor pressure or presence .Cause: Minor energy or force, which may be director indirect.
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