Related Experiment Video
Updated: Sep 14, 2025
The Transition to an Anterior-Based Muscle Sparing Approach Improves Early Postoperative Function but is Associated with a Learning Curve
Published on: September 7, 2022
Complications, Conversion, and Secondary Procedures Following Minimally Invasive Periacetabular Osteotomy: A
Mohammad H Amer1,2, Yash Pursun3, Christian Smith4
1Orthopaedic Department, Northumbria Healthcare NHS Foundation Trust, Northumbria House, Cobalt Business Park, Newcastle Upon Tyne, UK.
Background:
The introduction of minimally invasive periacetabular osteotomy (PAO) has reduced complications, allowing a broader range of patients to be considered for the procedure. This study aimed to identify patient-specific risk factors for poor outcomes.
Methods:
This retrospective case series (n = 513) used data from a local hip registration registry. Isolated PAOs with at least 1-year follow-up were included. Electronic records were reviewed to extract demographics and variables. The primary outcome was complication rate, with secondary outcomes including secondary procedures and conversion to total hip arthroplasty. Logistic regression was performed to correlate independent variables to outcomes, and Kaplan-Meier analysis assessed the survival of the native hip and cumulative complication risk.
Results:
Complication rate was 6.2%. Higher body mass index (BMI), smoking, Tönnis grade 2, and increasing age were associated with higher odds of complications (P < .05). The nonunion rate was 4.3%; higher BMI and age linked to increased risk (P < .05). 10.9% of patients required a secondary procedure and cumulative risk for secondary procedures at 5 years was 11.4% and at 10 years was 17.2%. BMI correlated with the need for secondary procedures (P = .001). 3.7% (n = 19) required conversion to total hip arthroplasty with a mean time to conversion of 4.6 years ±2.04. The 5- and 10-year survival rates were 96.3 and 92.7%, respectively.
Conclusions:
Minimally invasive PAO has acceptable rates of complication and conversion at mid-term follow-up. Age, BMI, smoking status, and Tönnis grade 2 are associated with inferior outcomes. Knowledge of patient-specific risk factors can help in decision-making, expectation setting, and perioperative interventions.
