Glenoid resurfacing: What are the limits to asymmetric reaming for posterior erosion?

doi:10.1016/j.jse.2007.03.015

Journal of Shoulder and Elbow Surgery

Volume 16, Issue 6, November–December 2007, Pages 843-848

https://doi.org/10.1016/j.jse.2007.03.015 Get rights and content

Eccentric posterior glenoid erosion is a common condition in osteoarthritis. No limits have ever been placed on the degree of eccentric erosion that can be corrected while still maintaining sufficient bone stock to implant a glenoid securely. Five cadaveric scapulae were dissected. Posterior glenoid erosion was created to simulate retroversion of 15° or more. A computed tomography (CT) scan confirmed the degree of glenoid retroversion. The glenoid was then reshaped to correct the glenoid retroversion to neutral, and a glenoid component with central and peripheral pegs was inserted. A second CT scan confirmed the correction to neutral and also evaluated the fit of the component into the glenoid. In all 5 experimental cases, at least 1 of the 4 pegs penetrated the glenoid vault. In 1 case, there was a fracture of the anterior rim. Glenoid retroversion of 15° or more cannot be satisfactorily corrected simply by reaming to lower the anterior edge of the glenoid and restore neutral version when using a glenoid component with peripheral pegs.

Section snippets

Material and methods

Five healthy shoulders from 5 fresh-frozen cadavers were used. These specimens had no evidence of glenoid dysplasia, arthritis, or former surgery. The mean age of the donors (4 women and 1 man, 4 right and 1 left) was 64.4 years.

Dissections were done after overnight thawing at room temperature. The soft tissues of the shoulder were removed, and only the scapula and the proximal humerus were retained. The glenoid and the humeral head sizes were measured so that the correct glenoid component

Results

Preoperative glenoid measurement indicated that 2 small, 2 medium, and 1 large glenoid would fit. The humeral head size measured extended from 40 to 48 mm. In every case, the glenoid size measured by comparison with the trial component, corresponded to the humeral head size measured.

The mean created defect, calculated with the CT scan, was of 24° (from 15° to 31°). In all 5 experimental cases, the glenoid version was corrected to neutral after the asymmetric reaming, restoring the normal

Discussion

Posterior glenoid bone loss through progressive erosion may occur in some patients who require total shoulder arthroplasty for arthritis. This can be associated with an acquired retroversion and, in some patients, posterior subluxation of the humeral head.27, 28 Although most patients have only mild degrees of posterior erosion, failure to correct glenoid orientation to neutral in the more severe cases can result in a suboptimal outcome with hemiarthroplasty or glenoid loosening with total

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Glenoid retroversion and humeral head subluxation is a progressive disorder due to abnormal force coupling and increased contact force. In situ placement of anatomic total shoulder arthroplasty (TSA) components in this scenario results in edge loading, progressive subluxation, and early failure. Wedged glenoid components have been demonstrated to improve glenohumeral alignment, but have not been correlated with mid-term clinical outcomes.
Patients undergoing TSA using a wedged all-polyethylene glenoid component for retroverted glenoid deformity were identified from a prospectively maintained database. Preoperative planning computed tomography was routinely performed and compared to postoperative correction on radiographic evaluation. Evidence of loosening was correlated to prospectively collect clinical outcome using patient-reported outcome measures. A matched group of neutrally aligned glenohumeral joints undergoing anatomic TSA was used to compare improvement in clinical outcomes.
Over a 5-year period, 17 patients with mean age 60 (range 43-81, standard deviation 10.5) were identified with a mean preoperative neoglenoid retroversion of 16.7° (standard deviation 4.5). At a mean follow-up of 43.8 months (range 27-60), no revision surgeries were undertaken. Improvement in the Oxford Shoulder Score was 18 points (P < .0001). The mean improvement was compared to a matched control group demonstrating a comparable magnitude of improvement of 20.4 points.
Wedged polyethylene components for Walch B2-type glenoids in TSA yield acceptable correction of the joint line, excellent clinical outcomes, and survivorship is maintained in the short term. The clinical and radiological outcome demonstrated similar improvement to that seen in A type deformities.
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Glenoid bone grafting is an option to correct severe glenoid retroversion and posterior bone loss in the setting of primary total shoulder arthroplasty (TSA). However, limited studies report the midterm outcomes of this procedure.
This was a retrospective case series of patients undergoing TSA with an autologous humeral head glenoid bone graft by a single surgeon between 2004 and 2014. Outcome variables included preoperative and postoperative forward elevation, external rotation, internal rotation, visual analog scale score, American Shoulder and Elbow Surgeons score, and simple shoulder test score. Radiographic variables included the acromiohumeral interval and Lazarus glenoid loosening score.
In total, 7 cases were included in our analysis. The mean age was 65.0 years (range 55-80), and the mean follow-up was 6.8 years (range 4.2-8.2). All patients had a diagnosis of osteoarthritis as the primary indication for surgery. The glenoid implant types were 2 pegged (28.6%) and 5 keeled (71.4%). The Walch glenoid classifications were 3 B2 (42.9%), 1 B3 (14.3%), and 3 with unavailable preoperative computed tomography scans (42.9%). Mean forward elevation, external rotation, visual analog scale, and American Shoulder and Elbow Surgeons all improved significantly from preoperative to postoperative. Mean internal rotation and simple shoulder test trended toward improvement. Radiographic glenoid loosening was observed in 1 patient, and 1 patient underwent revision to reverse TSA due to graft resorption and glenoid loosening at 8.3 years following the index procedure.
Glenoid bone grafting is a viable option for patients requiring TSA with severe glenoid retroversion and posterior bone loss. Graft resorption and glenoid loosening remain concerns; however, the majority of patients in our study demonstrated significant improvement following their procedure.
Approach to glenoid bone loss and deformity in B3 and C glenoids: primary anatomic shoulder arthroplasty
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Anatomic total shoulder arthroplasty in the setting of posterior glenoid bone loss creates a reconstructive challenge for shoulder surgeons. Glenoid retroversion and posterior humeral head subluxation can lead to eccentric wear and poor outcomes. The purpose of this article is to discuss strategies for the surgical treatment of Walch Type B3 and C glenoids in anatomic total shoulder arthroplasty, including eccentric reaming, bone grafting, the use of inlay glenoid components, and the use of augmented glenoid components. Additionally, we review the classification of glenoid morphology, techniques for measuring glenoid retroversion and humeral head subluxation, and risk factors for failure of anatomic total shoulder arthroplasty in the patient with posterior glenoid bone loss.
Does glenoid version and its correction affect outcomes in anatomic shoulder arthroplasty? A systematic review
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Correction of glenoid retroversion is commonly performed in anatomic total shoulder arthroplasty (TSA) to increase component contact area and decrease eccentric loading of the glenoid component. Despite demonstrated biomechanical advantages, limited information exists on the clinical benefit of correcting glenoid retroversion. The purpose of this systematic review is to critically evaluate the existing literature on the effect of preoperative and postoperative glenoid retroversion on clinical functional and radiologic outcomes in patients who underwent anatomic TSA.
A systematic literature review was performed according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses using PubMed, Embase, and Cochrane Library evaluating the impact of glenoid retroversion on clinical and radiologic outcomes of TSA. English-language studies of level I through IV evidence were included. Blinded reviewers conducted multiple screens and methodological quality was appraised using the Modified Coleman Methodology Score.
Sixteen studies, including 3 level III and 13 level IV studies (1211 shoulders), satisfied all inclusion criteria. To address glenoid retroversion, 9 studies used corrective reaming techniques, and 4 studies used posteriorly augmented glenoids. Two studies used noncorrective reaming techniques. Mean preoperative retroversion ranged from 12.7° to 24° across studies. Eleven studies analyzed the effect of glenoid retroversion on clinical outcomes, including patient-reported outcome scores (PROs), range of motion (ROM), or clinical failure or revision rates. Most studies (8 of 11) did not report any significant association of pre- or postoperative glenoid retroversion on any clinical outcome. Of the 3 studies that reported significant effects, 1 study reported a negative association between preoperative glenoid retroversion and PROs, 1 study reported inferior postoperative abduction in patients with postoperative glenoid retroversion greater than 15°, and 1 study found an increased clinical failure rate in patients with higher postoperative retroversion. Ten studies reported radiographic results (medial calcar resorption, Central Peg Lucency [CPL] grade, Lazarus lucency grade) at follow-up. Only 1 study reported a significant effect of pre- and postoperative retroversion greater than 15° on CPL grade.
There is currently insufficient evidence that pre- or postoperative glenoid version influences postoperative outcomes independent of other morphologic factors such as joint line medialization. Given that noncorrective reaming demonstrated favorable postoperative outcomes, and postoperative glenoid version was not significantly and consistently found to impact outcomes, there is inconclusive evidence that correcting glenoid retroversion is routinely required.
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Primary glenohumeral osteoarthritis is associated with both excessive posterior humeral subluxation (PHS) and excessive glenoid retroversion in 40% of cases. These morphometric abnormalities are a particular issue because they may be responsible for a deterioration in long-term clinical and radiologic outcomes. The aim of this study was to perform a computed tomographic (CT) analysis of patients who underwent total shoulder arthroplasty (TSA) for primary osteoarthritis (OA) with B2-, B3-, or C-type glenoids in whom an attempt was made to correct for excessive glenoid retroversion and excessive posterior humeral subluxation intraoperatively.
We performed a retrospective, single-center study including 62 TSA patients with a preoperative PHS of the glenohumeral joint (31 men, 31 women, 70 ± 9 years) between January 2000 and January 2014. Glenoids were classified as B2 (32 cases), B3 (13 cases), or C (17 cases). Glenoid retroversion was corrected by anterior asymmetric reaming. Patients were reviewed for clinical and CT scan assessment with a mean follow-up of 8.3 years (minimum 5 years). At final follow-up, the CT images were reconstructed in the scapular plane. A PHS index >65% defined persistence.
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Correlation between PHS and retroversion was moderate preoperatively and strengthened at long-term follow-up. Anterior asymmetric reaming allowed for a surgical improvement of both PHS and retroversion, but it was not sufficient to maintain a correction over time. Glenoid loosening was more frequent in case of PHS persistence but seemingly without clinical relevance.
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Original articleGlenoid resurfacing: What are the limits to asymmetric reaming for posterior erosion?

Section snippets

Material and methods

Results

Discussion

Clin Biomech

J Shoulder Elbow Surg

J Shoulder Elbow Surg

J Shoulder Elbow Surg

J Shoulder Elbow Surg

J Shoulder Elbow Surg

J Shoulder Elbow Surg

J Shoulder Elbow Surg

J Shoulder Elbow Surg

J Shoulder Elbow Surg

J Shoulder Elbow Surg

J Shoulder Elbow Surg

J Arthroplasty

J Shoulder Elbow Surg

Original article
Glenoid resurfacing: What are the limits to asymmetric reaming for posterior erosion?