Hip arthroscopy in the setting of hip dysplasia: A systematic review.
OBJECTIVE
Hip arthroscopy in the setting of hip dysplasia is controversial in the orthopaedic community, as the outcome literature has been variable and inconclusive. We hypothesise that outcomes of hip arthroscopy may be diminished in the setting of hip dysplasia, but outcomes may be acceptable in milder or borderline cases of hip dysplasia.


METHODS
A systematic search was performed in duplicate for studies investigating the outcome of hip arthroscopy in the setting of hip dysplasia up to July 2015. Study parameters including sample size, definition of dysplasia, outcomes measures, and re-operation rates were obtained. Furthermore, the levels of evidence of studies were collected and quality assessment was performed.


RESULTS
The systematic review identified 18 studies investigating hip arthroscopy in the setting of hip dysplasia, with 889 included patients. Criteria used by the studies to diagnose hip dysplasia and borderline hip dysplasia included centre edge angle in 72% of studies but the range of angles were quite variable. Although 89% of studies reported improved post-operative outcome scores in the setting of hip dysplasia, revision rates were considerable (14.1%), with 9.6% requiring conversion to total hip arthroplasty.


CONCLUSIONS
The available orthopaedic literature suggests that although improved outcomes are seen in hip arthroscopy in the setting of hip dysplasia, there is a high rate of re-operation and conversion to total hip arthroplasty. Furthermore, the criteria used to define hip dysplasia vary considerably among published studies.Cite this article: M. Yeung, M. Kowalczuk, N. Simunovic, O. R. Ayeni. Hip arthroscopy in the setting of hip dysplasia: A systematic review. Bone Joint Res 2016;5:225-231. DOI: 10.1302/2046-3758.56.2000533.
McMaster University, 1200 Main St W, Room 4E15, Hamilton, Ontario L8N 3Z5, Canada.
M
M
Yeung
McMaster University, 1200 Main St W, Room 4E15, Hamilton, Ontario L8N 3Z5, Canada.
M
M
Kowalczuk
McMaster University, 293 Wellington St. N., Suite 110, Hamilton, Ontario L8L 8E7, Canada.
N
N
Simunovic
McMaster University, 1200 Main St W, Room 4E15, Hamilton, Ontario L8N 3Z5, Canada ayenif@mcmaster.ca.
O R
OR
Ayeni
Borderline dysplasia; Hip arthroscopy; Hip dysplasia; Indications; Outcomes