Size of cup affects the anterior capsular distance in total hip arthroplasty, as measured with ultrasound

BMC Musculoskeletal Disorders

Hans Wingstrand²  Otto Robertsson²  Justinas Stucinskas¹  Valdemaras Loiba¹  Sarunas Tarasevicius² 

[1] Department of Orthopedics, Lund University Hospital, Getingevagen 4, Lund 22185, Sweden;Departments of Orthopedics, Lithuanian University of Health Sciences, Eiveniu 2, Kaunas LT-50009, Lithuania

关键词: THA;    Capsular distance;    Cup size;    Sonography;   

Others  :  1128876
DOI  :  10.1186/1471-2474-15-23

 received in 2013-08-30, accepted in 2014-01-17,  发布年份 2014

【 摘 要 】

Background

Previously was found that sonography is a reliable method to measure a capsular distance in total hip arthroplasty hips. The aim of our current study was to investigate the relation between the implanted size of the cup and the anterior capsular distance, as measured with ultrasound one year after THA.

Methods

50 osteoarthritis (OA) patients operated on with total hip arthroplasty one year before were included in the study and the anterior capsular distance was measured sonographically. Patients were grouped with respect to cup size. The correlation between the implanted cup size and capsular distance was determined.

Results

The mean capsular distance in the whole group was 1.37 (SD 0.19) cm. The mean capsular distance in the group with small cups was 1.27 (SD 0.13) cm, in large cups it was 1.45 (SD 0.20) cm, p = 0.02. Spearman correlation analysis showed a statistically significant correlation between a greater capsular distance and the larger size of the cup (r = 0.5, p < 0.0001).

Conclusion

The greater capsular distance in successful THA hips is affected by cup size. We propose that this should be considered when evaluating sonography of the anterior capsular distance after THA.

【 授权许可】

   
2014 Tarasevicius et al.; licensee BioMed Central Ltd.

【 图 表 】

Figure 1.

Figure 2.

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