Hip Dysplasia Research

Developmental dysplasia of the hip (DDH, or hip dysplasia, is a developmental condition that occurs during the growth of the hip joint, over the first 1-2 decades of life. Hip dysplasia describes a shallow acetabulum or hip socket that is insufficiently deep to adequately cover the femoral head. This insufficient coverage creates abnormal hip loading mechanics where the bone and cartilage at the edge of the acetabulum see very high loading forces during weight-bearing activities such as standing and walking. If hip dysplasia is left untreated, these high loads at the rim of the socket cause the hip’s cartilage and labrum to break down, causing pain, decreased function, and eventually hip osteoarthritis.

Hip dysplasia is the most common pediatric hip condition – about 1 in 6 newborns will have hip instability and about 3 in 1,000 will require surgery for hip dysplasia. Hip dysplasia can result in pain and dysfunction starting in childhood through young adulthood, and is the leading cause of early-onset hip osteoarthritis before the age of 60 years. The poor prognosis of hip dysplasia warrants careful attention towards early identification and intervention in these hips with anatomical risk factors for mechanical misbehavior. Our research is focused on the proper screening, diagnosis, treatment, and prevention of hip dysplasia to provide the best patient care and improve the quality of life for those affected.

Highlighted Work

Pun SY, Hosseinzadeh S, Dastjerdi R, Millis MB. What Are the Early Outcomes of True Reverse Periacetabular Osteotomy for Symptomatic Hip Overcoverage? Clin Orthop Relat Res. 2020 Dec 17; doi: 10.1097/CORR.0000000000001549. PMID: 33296152.

DeBaun MR, Ziino C, LaPrade C, Pun S, Avedian RS, Bellino MJ. An anatomic classification for heterotopic ossification about the hip. J Orthop. 2020 Mar 28;21:228-231. doi: 10.1016/j.jor.2020.03.038. PMID: 32273662; PMCID: PMC7132042.

Darling CE, Pun SY, Caruso TJ, Tsui BCH. Successful directional thoracic erector spinae plane block after failed lumbar plexus block in hip joint and proximal femur surgery. J Clin Anesth. 2018 Sep;49:1-2. PubMed PMID: 29775780.

Pun SY, Hingsammer A, Millis MB, Kim YJ. Is Increased Acetabular Cartilage or Fossa Size Associated With Pincer Femoroacetabular Impingement?. Clin Orthop Relat Res. 2017 Apr;475(4):1013-1023. PubMed PMID: 27637612; PubMed Central PMCID: PMC5339120.

Pun S. Hip dysplasia in the young adult caused by residual childhood and adolescent-onset dysplasia. Curr Rev Musculoskelet Med. 2016 Dec;9(4):427-434. PubMed PMID: 27613709; PubMed Central PMCID: PMC5127949.

Pun S, Kumar D, Lane NE. Femoroacetabular impingement. Arthritis Rheumatol. 2015 Jan;67(1):17-27. PubMed PMID: 25308887; PubMed Central PMCID: PMC4280287.

Faculty Contact

Dr. Stephanie Pun

Research Contact