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Does body mass index affect restoration of femoral offset, leg length and cup positioning after total hip arthroplasty?: A prospective cohort study
Umea Univ, Sweden.
Umea Univ, Sweden.
Umea Univ, Sweden.
Linköping University, Department of Clinical and Experimental Medicine, Division of Surgery, Orthopedics and Oncology. Linköping University, Faculty of Medicine and Health Sciences.
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2019 (English)In: BMC Musculoskeletal Disorders, ISSN 1471-2474, E-ISSN 1471-2474, BMC MUSCULOSKELETAL DISORDERS, Vol. 20, no 1, article id 422Article in journal (Refereed) Published
Abstract [en]

Background

In obese patients, total hip arthroplasty (THA) can be technically demanding with increased perioperative risks. The aim of this prospective cohort study is to evaluate the effect of body mass index (BMI) on radiological restoration of femoral offset (FO) and leg length as well as acetabular cup positioning.

Methods

In this prospective study, patients with unilateral primary osteoarthritis (OA) treated with THA between September 2010 and December 2013 were considered for inclusion. The perioperative plain radiographs were standardised and used to measure the preoperative degree of hip osteoarthritis, postoperative FO, leg length discrepancy (LLD), acetabular component inclination and anteversion.

Results

We included 213 patients (74.5% of those considered for inclusion) with a mean BMI of 27.7 (SD 4.5) in the final analysis. The postoperative FO was improper in 55% and the LLD in 15%, while the cup inclination and anteversion were improper in 13 and 23% of patients respectively. A multivariable logistic regression model identified BMI as the only factor that affected LLD. Increased BMI increased the risk of LLD (OR 1.14, 95% CI 1.04 to 1.25). No other factors included in the model affected any of the primary or secondary outcomes.

Conclusion

Increased BMI showed a negative effect on restoration of post-THA leg length but not on restoration of FO or positioning of the acetabular cup. Age, gender, OA duration or radiological severity and surgeon’s experience showed no relation to post-THA restoration of FO, leg length or cup positioning.

Place, publisher, year, edition, pages
BioMed Central, 2019. Vol. 20, no 1, article id 422
Keywords [en]
BMI; Hip arthroplasty; Femoral offset; Leg length discrepancy; Cup positioning
National Category
Orthopaedics
Identifiers
URN: urn:nbn:se:liu:diva-160587DOI: 10.1186/s12891-019-2790-yISI: 000485277400001PubMedID: 31510993Scopus ID: 2-s2.0-85072113263OAI: oai:DiVA.org:liu-160587DiVA, id: diva2:1362724
Available from: 2019-10-21 Created: 2019-10-21 Last updated: 2019-10-28Bibliographically approved

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Kadum, Bakir
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Division of Surgery, Orthopedics and OncologyFaculty of Medicine and Health Sciences
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