PURPOSE OF THE STUDY: The purpose of this study was to analyze the natural history of @entity571 joint secondary to non-operated anterior instability, to evaluate the clinical and radiological outcome after arthroplasty for this indication, and to compare results with data reported in the literature. MATERIAL AND METHODS: Twenty-eight Aequalis shoulder arthroplasties were performed for @entity571 secondary to anterior shoulder instability in @entity1 who had not undergone any prior stabilizing surgical procedure. This multicentric series was reviewed retrospectively at a mean follow-up of 44 months (range 24-87 month). Preoperative and last follow-up clinical status was compared using the Constant score. Standard operative technique was used and anatomic position of the implants was achieved in 27 @entity1 . Total shoulder arthroplasty was performed in eighteen @entity1 and simple humeral implantation in ten. @entity1 were divided into two sub-groups for analysis of outcome (age at first dislocation > or < 40 years). RESULTS: There were four complications including one early loosening that required revision arthroplasty. Outcome was excellent or good in 54% of the cases. Group 1 (age at first dislocation < 40 years) included 17 @entity1 and exhibited male predominance (13/17), young age at first dislocation (mean 28.5 years), high number of dislocations (mean 13), and a long natural history of @entity571 (mean 28 years). In this sub-group, imaging disclosed constructive @entity571 reflecting a long history. There was one case with a full-thickness tear of the supraspinatus. Outcome was excellent or good in 64% of these 17 @entity1 (14 underwent total shoulder arthroplasty). The sub-group of 11 @entity1 whose first dislocation occurred after the age of 40 years exhibited female predominance (9/11), a small number of dislocations (mean 1.3), and a short natural history of @entity571 (mean 6 years). In this sub-group, imaging disclosed six cases of basically chondrolytic @entity571 reflecting a short evolution. There were seven cases of full-thickness tears of the supraspinatus. Outcome was excellent or good in 36% of these 11 @entity1 (4 underwent total shoulder arthroplasty). DISCUSSION: The forty-year age cutoff allowed us to distinguish two populations. The first population of @entity1 whose first dislocation had occurred before the age of 40 years was predominantly male, with a long history of constructive @entity571 without rotator cuff tears. Most of these @entity1 were treated with total shoulder arthroplasty which gave results similar to those obtained with arthroplasty for primary centered @entity571 . The second sub-group of @entity1 aged over 40 years at the time of the first dislocation were predominantly female with a short history of minimally constructive @entity571 and frequent rotator cuff tears. Humeral implants were used for most of these @entity1 and gave less favorable results than in the former sub-group, probably due to the high rate of rotator cuff tears.

[Shoulder arthroplasty for non-operated anterior shoulder instability with secondary XXXX ].

@entity1 :: ('9606', 'Species') :: ['patients', 'Patients'] @entity571 :: ('MESH:D010003', 'Disease') :: ['osteoarthritis', 'osteoarthritis of the shoulder']
@entity571 :: (MESH:D010003,Disease) :: ['osteoarthritis']
