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· DOS Abstracts
Cup orientation after total hip arthroplasty is not
challenged by obesity or preoperative anatomical
properties of the acetabulum.
Roshan Latifi, Bjørn Gliese Jakobsen, Henrik Husted, Thomas Kallemose, Anders
Troelsen, Kirill Gromov
Orthopaedics, Hvidovre Hospital; Clinical Orthopaedic Research Hvidovre, Hvi-
dovre Hospital; Orthopaedics, Hvidovre Hospital; Clinical Orthopaedic Research
Hvidovre, Hvidovre Hospital; Orthopaedics, Hvidovre Hospital; Orthopaedics,
Hvidovre Hospital
Background:
Acetabular component orientation is a crucial parameter in pre-
dicting unfavourable clinical results following primary Total Hip Arthroplasty
(THA), such as dislocation or bearing surface wear. Therefor factors, which
can potentially influence cup positioning following THA, should be substantially
studied.
Purpose / Aim of Study:
Study of influence of easily identifiable preoperative
radiographic features and demographic parameters on cup malpositioning after
primary THA.
Materials and Methods:
1326 consecutive and unselected patients received
primary uncemented THA, between 2011 and 2015. Standardized posterolat-
eral approach, by 9 high volume surgeons was used. Sex, age, American Society
of Anesthesiologists score (ASA), BMI, Tönnis score, Lateral Center Edge angle
(LCE) and Anterior Center edge angle (ACE) were registered. Postoperative fea-
tures such as abduction and version of the cup recorded. Logistic regression
models were used to analyse probability of cup malpositioning.
Findings / Results:
There was not any significant higher risk of cup malposi-
tioning in patients with BMI over 30 when compared with patients with lower
BMI (Odds Ratio: 0.89, 0.67-1.20, P-value: 0.45). Patients with preoperative
severe osteoarthritis did not have a higher risk of postoperative cup malposi-
tioning (Odds Ratio: 1.10, 0.80-1.49,P-value: 0.56). Neither ACE between 30
and 50 degrees (OR: 0.76, 0.55-1.05, p: 0.09) nor ACE > 50 (OR: 0.70, 0.46-
1.05, P: 0.08) pose a special risk to cup malpositioning.
Conclusions:
Neither BMI nor preoperative anatomical status seems to be a
predictive preoperative factor for malpositioning of the cup after primary THA.
This could be explained by the posterolateral approach, which allows the sur-
geon excellent visibility or the experience of high volume surgeons might play
a role.
No conflicts of interest reported
106.