==== Front
Orthop J Sports MedOrthop J Sports MedOJSspojsOrthopaedic Journal of Sports Medicine2325-9671SAGE Publications Sage CA: Los Angeles, CA 10.1177/2325967118S0015010.1177_2325967118S00150ArticleWhat is The Impact of PAO Surgery on Patient Function and Activity
Levels? Petrie Jeff MD1An Tonya BS1Schoenecker Perry MD1Zaltz Ira MD2Kim Young-Jo MD3Millis Michael B. MD4Beaule Paul MD5Sierra Rafael J. MD6Trousdale Robert MD6Sucato Daniel J. MD, MS7Podeszwa David MD7Sink Ernest MD8Clohisy John C. MD11 Washington University, Saint Louis, MO,
USA2 Beaumont Hospital, Royal Oak, MI,
USA3 Children’s Hospital, Boston, MA,
USA4 Boston Children’s Hospital, Boston, MA,
USA5 The Ottawa Hospital, Ottawa, ON,
Canada6 Mayo Clinic, Rochester, MN, USA7 Texas Scottish Rite Hospital for
Children, Dallas, TX, USA8 Hospital for Special Surgery, New York,
NY, USA27 7 2018 7 2018 6 7 suppl4 2018 AOSSM Annual Meeting Abstracts2325967118S00150© The Author(s) 20182018SAGE PublicationsThis open-access article is published and distributed under the
Creative Commons Attribution - NonCommercial - No Derivatives License
(http://creativecommons.org/licenses/by-nc-nd/4.0/), which
permits the noncommercial use, distribution, and reproduction of the article
in any medium, provided the original author and source are credited. You may
not alter, transform, or build upon this article without the permission of
the Author(s). For article reuse guidelines, please visit SAGE’s website at
http://www.sagepub.com/journals-permissions.Objectives:
The Bernese periacetabular osteotomy (PAO) is becoming a widely utilized
procedure. Patients are younger, highly active, and may desire to return to
sport activity. Counseling and managing expectations in these patients is
challenging as there is limited information regarding activity level after
PAO. The purpose of this study was to analyze physical activity levels after
PAO in a large, prospective multicenter cohort.

Methods:
Assessment of prospectively collected data from a multicenter group included
456 hips treated by PAO for hip dysplasia. After exclusions, 359 hips (80
male, 279 female) remained with a mean age of 25.9 years and mean BMI of 25.
Demographics, radiographic measures, and clinical outcomes were evaluated
preoperatively, at 1 year follow-up, and at minimum 2 years postoperatively
(mean 44.9 months). Activity level was assessed with the University of
California-Los Angeles (UCLA) activity score, patients were stratified into
low, moderate, and high activity groups based on preoperative function.
Descriptive statistics and linear regressions were performed for the primary
outcome of change in UCLA.

Results:
UCLA scores were improved on average 0.6 points at final follow up (p =
0.001). When stratified, the low activity and moderate activity groups had
significant improvement in UCLA scores (p<.0001 and p=0007) while the
high activity group saw a decrease in UCLA scores (p<.0001). mHHS, HOOS
Pain, and HOOS Sports and Recreation scores were significantly improved
across all activity levels. Univariable linear regression analysis
identified prior ipsilateral surgery, arthroscopy at time of PAO, and
preoperative ACEA to be predictors of the change in UCLA score (p<0.05).
With the multivariable model, the effect of prior ispilateral surgery was
maintained (p = 0.002).

Conclusion:
The data suggests that improvements in activity level and function can be
expected following PAO surgery, with greater gains experienced by patients
with lower preoperative level of activity.

Figure 1. Change in UCLA activity score after PAO, stratified by preoperative
activity.

Figure 2. Change in Modified Harris Hip (mHHS), the Hip disability and
Osteoarthritis Outcome Score (HOOS) pain subscore and HOOS sports
and recreation subscore, stratified by preoperative activity.

edited-statecorrected-proof