Risk of dislocation using large- vs. small-diameter femoral heads in total hip arthroplasty

BMC Research Notes

Michael A Mont²  Michael Akbar³  Kimona Issa²  D Alex Stroh²  Thorsten M Seyler¹  Johannes F Plate³ 

[1] Department of Orthopaedic Surgery, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, NC, 27157-1070, USA;Rubin Institute for Advanced Orthopedics, Center for Joint Preservation and Replacement, Sinai Hospital of Baltimore, 2401 West Belvedere Avenue, Baltimore, MD, 21215, USA;Department of Orthopaedic Surgery and Rehabilitation Medicine, University of Heidelberg, Schlierbacher Landstrasse 200a, Heidelberg, Germany

关键词: Harris Hip score;    Total hip arthroplasty;    Dislocation;    Large-diameter;   

Others  :  1165512
DOI  :  10.1186/1756-0500-5-553

 received in 2012-04-16, accepted in 2012-09-20,  发布年份 2012

【 摘 要 】

Background

Dislocation remains a difficult problem in total hip arthroplasty. Large-diameter femoral heads may lower the incidence of dislocation by enhancing the jump distance and decreasing impingement, but their performance against small-diameter heads has not been assessed. This study compared the mid-term radiographic and functional outcomes of two matched cohorts of patients undergoing total hip arthroplasty who had a high pre-operative risk for dislocation and who received either small-diameter (26- or 28-millimeters) or large-diameter (≥36-millimeters) femoral heads.

Methods

All patients who received large-diameter heads (≥36-millimeter) between 2002 and 2005, and who had pre-operative risk factors for dislocation, were identified in the institution’s joint registry. Forty-one patients (52 hips) who received large-diameter heads were identified, and these patients were matched to 48 patients (52 hips) in the registry who received small-diameter femoral heads.

Results

At mean final follow-up of 62 months (range, 49 to 101 months), both groups achieved excellent functional outcomes as measured by Harris Hip scores, with slightly better final scores in the large-diameter group (90 vs. 83 points). No patient showed any radiographic signs of loosening. No patient dislocated in the large-diameter femoral head group; the smaller-diameter group had a greater rate of dislocation (3.8%, 2 out of 52).

Conclusions

Large-diameter femoral head articulations may reduce dislocation rates in patients who have a high pre-operative risk for dislocation while providing the same functional improvements and safety as small-diameter bearings.

【 授权许可】

   
2012 Plate et al.; licensee BioMed Central Ltd.

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