Abstract
BackgroundIn addition to Bankart repair engaging Hill-Sachs defects in glenohumeral instability have been treated successfully with remplissage procedure. The purpose of this study was to compare three remplissage techniques regarding (I) ability of preventing Hill-Sachs defect from engaging, (II) influence on glenohumeral rotational torque, and (III) resulting tendon coverage over the Hill-Sachs defect.MethodsStandardized engaging Hill-Sachs defects and Bankart lesions were created in n = 7 fresh frozen human shoulder specimens. Besides Bankart repair three remplissage techniques (T) with double anchor position in the valley of the defect zone were studied: T1, knots tied over anchors; T2, knots tied between anchors (double-pulley); T3, knotless anchors with a suture tape.A parallel position-orientation and force-moment controlled navigated roboticsystem was used to compare prevention of Hill-Sachs defect engagement and torque [Nm]. Pressure sensitive film was used to study area of infraspinatus tendon coverage over Hill-Sachs defect [%].ResultsAll remplissage techniques prevented engagement of the Hill-Sachs defect without showing any construct failures. Regarding humeral torque there were significant impairments observed between intact conditions and the three investigated repair techniques in 60° abduction and ≥30° external rotation (p < .04). There was no significant difference in torque between intervention groups (n.s.). With a mean coverage of 26.8 % over the defect zone the knotless suture tape technique (T3) significantly improved area of soft tissue coverage compared to the other techniques (p = .03).ConclusionAll remplissage techniques prevented engagement of the Hill Sachs defect. With high abduction and external rotation ≥30° all techniques showed significant higher humeral torque compared to the intact specimens, while there was not one technique superior over the others. The suture tape technique conferred the largest and most effective area of tendon coverage over the Hill-Sachs defect zone. Long-term success of the remplissage procedure can possibly be enhanced by increasing the interface area of tendon coverage over the Hill-Sachs defect. Clinical studies will be necessary to proof potential benefits for clinical outcome.
Highlights
In addition to Bankart repair engaging Hill-Sachs defects in glenohumeral instability have been treated successfully with remplissage procedure
Several studies have shown that an engaging HillSachs defect treated with Bankart repair alone is associated with a high re-dislocation rate [1, 3,4,5]
Filling of the Hill-Sachs defect by infraspinatus tendon and capsule on postoperative scans has been demonstrated [17], there are no studies in the literature investigating the amount of infraspinatus tendon coverage over the defect zone produced by different techniques
Summary
In addition to Bankart repair engaging Hill-Sachs defects in glenohumeral instability have been treated successfully with remplissage procedure. First described an open procedure of filling a Hill-Sachs defect with infraspinatus and capsule tenodesis, together with a Bankart repair [10]. This technique works by converting an intra-articular defect into an extra-articular one and preventing the defect from engaging at the anterior glenoid rim. Cadaveric studies have shown that medium sized Hill-Sachs lesions without glenoid bone loss can be successfully treated with the remplissage procedure if combined with Bankart repair [12, 13]. Filling of the Hill-Sachs defect by infraspinatus tendon and capsule on postoperative scans has been demonstrated [17], there are no studies in the literature investigating the amount of infraspinatus tendon coverage over the defect zone produced by different techniques
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