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Incidence of capsular closure and piriformis preservation on the prevention of dislocation after total hip arthroplasty through the minimal posterior approach: comparative series of 196 patients

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Abstract

Purpose of the study

This study analyzes the incidence on hip dislocation of a posterior minimally invasive approach that combines the suture of the capsular joint and the preservation of the piriformis muscle.

Materials and methods

A first prospective series of 98 patients having undergone hip prosthesis by a posterior minimally invasive approach that combines piriformis preservation and capsular closure is analyzed regarding seven criteria: age, weight, duration of surgery, piriformis integrity and quality of capsular closure at the end of the intervention, radiological position of the implants and rate of dislocation at M12. This series is compared to another consecutive series of 98 hip prostheses performed by the same surgeon, via posterior approach, consisting in capsular resection and cutting of the piriformis reinserted on the trochanter.

Results

The two series were identical regarding patients’ age and weight. The minimally invasive surgery lasted 20 min more than the other intervention. In both surgeries, no effect was observed on the radiological position of the implants. The rate of hip dislocation after 12 months was significantly improved by the capsular closure combined with piriformis preservation (2.9 vs 0%).

Discussion

The restoration of the capsular plane has been the subject of numerous works. The techniques described had some variations, with a related rate of dislocation <1%. Piriformis preservation participates in the joint coaptation. This muscle is stretched out during the first step of the dislocating movement.

Conclusion

The presented series highlights the benefit of combining a capsular flap truly suturable and the preservation of the piriformis muscle aimed at creating a “hammock”, passive and active at the same time, at the upper posterior part of the joint, a strategic area with a high related risk of dislocation.

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Authors and Affiliations

  1. Service de Chirurgie Orthopédique, Centre Hospitalier de Meulan, 78250, Meulan, France

    F. Prigent

  2. 1 rue Massenet, 75116, Paris, France

    F. Prigent

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  1. F. Prigent
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Correspondence to F. Prigent.

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Prigent, F. Incidence of capsular closure and piriformis preservation on the prevention of dislocation after total hip arthroplasty through the minimal posterior approach: comparative series of 196 patients. Eur J Orthop Surg Traumatol 18, 333–337 (2008). https://doi.org/10.1007/s00590-008-0295-8

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  • DOI: https://doi.org/10.1007/s00590-008-0295-8

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