disease has basis in dysfunction of collagen type IX trimer collagenopathy multiple epiphyseal dysplasia due to collagen 9 anomaly https://www.malacards.org/card/multiple_epiphyseal_dysplasia_due_to_collagen_9_anomaly MEDGEN:1647610 Orphanet:166002 SCTID:766717008 icd11.foundation:741183905 DOID:0070305 MONDO:0015627 NANDO:2201016 UMLS:C4707798 GARD:0015024 Multiple epiphyseal dysplasia due to collagen 9 anomaly is a rare primary bone dysplasia disorder characterized by normal or mild short stature, early-onset pain and/or stiffness of the joints (mainly affecting knees but also elbows, wrists, ankles and fingers, with relative sparing of the hips) and early degenerative joint disease. Other skeletal anomalies (incl. varus or valgus deformities, osteochondritis dissecans, abnormal carpal shape, free articular bodies) and mild myopathy have also been reported. multiple epiphyseal dysplasia hereditary disorder of connective tissue