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· DOS Abstracts
Can Surgeons Reduce Risk For Dislocation
Following Primary THA Performed Using
Posterolateral Approach?
Kirill Gromov, Roshan Latifi, Bjørn Glise Madsen, Henrik Husted, Thomas
Kallemose, Anders Troelsen
Department of Orthopaedic Surgery, Hvidovre Hospital
Background:
Multiple patient- as well as surgery-related parameters have
been identified as contributing to the risk of dislocation following primary THA,
however the role of component positioning is still controversial
Purpose / Aim of Study:
In this study, we investigated if surgery-related
factors are independent risk factors for dislocation following primary THA per-
formed through a posterolateral approach
Materials and Methods:
We identified 1326 consecutive hips receiving pri-
mary uncemented THA. All patients were operated using a standardized poste-
rolateral approach. Patient demographics, including age, gender, ASA score and
BMI were recorded. Surgery related factors including femoral head size, off-set
restoration, leg length restoration and cup positioning were also recorded. All
dislocations were identified. Logistical regression analysis was used to identify
independent risk factors for dislocation
Findings / Results:
Mean follow-up was 701, range (1-1674) days. 59 (4.5%)
dislocations were identified. Hips with dislocations were significantly older (75.5
vs 67.9 years, p <0.001), had higher ASA score (p=0.03), significantly less an-
teverted acetabular components (14.1 vs 17.3, p=0.007). Increasing age (OR
1.06; 95%CI(1.02-1.10)), BMI < 25 (OR 2.65; 95%CI(1.26-5.57), BMI >30
(OR 2.47; 95%CI(1.07- 5.71)) and post operative shortening of the leg >5
mm (OR 2.54; 95%CI(1.02-6.33) were independent risk factors for dislocation
Conclusions:
Placement of the acetabular component outside target zone de-
fined as 30º-45° abduction and 5º-25° anteversion does not lead to increased
risk for early dislocation following a primary THA performed with a posterolat-
eral approach, however hips with dislocations tend to be less anteverted. Failing
to restore or increase leg length lead also leads to increased risk for dislocations
No conflicts of interest reported
127.