RT Book, Section
A1 Rosenfeld, Scott B.
A1 Podeszwa, David A.
A2 Kline, Mark W.
SR Print(0)
ID 1182933010
T1 Developmental Conditions of the Hip
T2 Rudolph's Pediatrics, 23e
YR 2018
FD 2018
PB McGraw-Hill Education
PP New York, NY
SN 9781259588594
LK accesspediatrics.mhmedical.com/content.aspx?aid=1182933010
RD 2024/04/19
AB Developmental  dysplasia  of  the  hip  (DDH)  is  a  spectrum  of  disorders  of  the  developing  hip  ranging  from  a  slightly  shallow  acetabulum  (hip  socket)  with  a  well-located  femoral  head  to  a  moderately  shallow  socket  with  joint  subluxation  to  a  severely  shallow  socket  with  complete  dislocation  of  the  joint.  DDH  evolves  over  time  and  may  present  in  different  forms  at  different  ages.  DDH  may  not  be  detectable  at  birth,  and  hence,  the  preferred  term  is  developmental  and  not  congenital.  The  American  Academy  of  Pediatrics  (AAP)  defines  DDH  as  a  condition  in  which  the  femoral  head  has  an  abnormal  relationship  to  the  acetabulum,  specifically,  the  acetabulum  does  not  completely  cover  the  femoral  head.  It  can  result  in  hip  joint  instability.  Dislocation  is  defined  as  complete  displacement  of  a  joint,  with  no  contact  between  the  original  articular  surfaces.  Subluxation  is  defined  as  displacement  of  a  joint  with  some  contact  remaining  between  the  articular  surfaces.  Dysplasia  refers  to  abnormal  or  deficient  development  of  the  acetabulum.  A  teratologic  dislocation  is  a  distinct  condition  that  occurs  before  birth,  is  generally  nonreducible  on  physical  exam,  and  causes  the  hip  to  be  stiff.  Teratologic  dislocations  often  are  associated  with  other  syndromes  and  conditions,  particularly  arthrogryposis  and  myelodysplasia,  and  treatment  depends  on  the  underlying  condition.