朋友摔了，胸部碰撞桌边，左肋表面瘀青，X光的报告是：

EXAMINATION: RIB UNILAT, W/ AP CHEST LEFT 
 INDICATION: XXX old woman with recent fall and left sided rib pain, h/o 
severe osteoporosis// evaluate left sided rib fracture 
 IMPRESSION: 
 Frontal and oblique views show no definite evidence of rib fracture or 
pneumothorax. Extensive costal cartilage calcification in the lower ribs 
makes it difficult to unequivocally exclude a nondisplaced fracture. 

请网友看看，是否骨折了？