Send to

Choose Destination
See comment in PubMed Commons below
J Arthroplasty. 2013 Sep;28(8 Suppl):41-4. doi: 10.1016/j.arth.2013.05.035. Epub 2013 Jul 30.

Are morbidly obese patients undergoing total hip arthroplasty at an increased risk for component malpositioning?

Author information

Department of Orthopaedic Surgery, Harris Orthopaedic Laboratory, Massachusetts General Hospital, Boston, Massachusetts.


Acetabular cup positioning is a critical factor in determining adverse clinical outcomes in THA. This evaluation was performed to determine if morbid obesity (BMI ≥35kg/m(2)) is a contributing risk factor to cup malpositioning. Two groups of patients were obtained from a local arthroplasty registry and match-controlled for gender, age, and diagnosis (n=211 morbidly obese; n=211 normal). Intraoperative data and postoperative AP pelvis and cross-table lateral radiographs were obtained for each patient. The Martell Hip Analysis Suite was used to calculate cup positioning (successful positioning defined as 30°-45° of abduction, and 5°-25° of anteversion), as well as varus-valgus alignment of the femoral stem. There was a significant correlation between morbid obesity with respect to underanteversion; using multivariate analysis, there was a trend toward a combined underanteversion/overabduction of the acetabular cup. Of all variables considered, high BMI was the most significant risk factor leading to malpositioning.


component malpositioning; obesity; total hip arthroplasty

[Indexed for MEDLINE]
PubMed Commons home

PubMed Commons

How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Elsevier Science
    Loading ...
    Support Center