disease has feature Reduced bone mineral density osteoporosis rheumatic disorder idiopathic juvenile osteoporosis https://www.malacards.org/card/osteoporosis_juvenile MONDO:0019409 Idiopathic juvenile osteoporosis (IJO) is a primary condition of bone demineralization childhood or adolescence that presents with pain in the back and extremities, walking difficulties, multiple fractures, and radiological evidence of osteoporosis. Onset usually occurs in the prepubertal period, between 8 and 12 years of age. idiopathic juvenile osteoporosis Paediatric osteoporosis NCIT:C119996 SCTID:3345002 Pediatric osteoporosis Orphanet:85193 UMLS:C0264080 MEDGEN:120494 GARD:0006760 icd11.foundation:183642011 ICD9:733.02 juvenile osteoporosis MESH:C537700 IJO Ijo OMIM:259750 DOID:12559 obsolete primary bone dysplasia with decreased bone density idiopathic disease