Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
Review
. 2022 Jan 4;10(1):23259671211063922.
doi: 10.1177/23259671211063922. eCollection 2022 Jan.

Comparison of Lateralized Versus Medialized Reverse Total Shoulder Arthroplasty: A Systematic Review and Meta-analysis

Sung-Hyun Cho  1 , Hyo-Jin Lee  1 , Osama R Aldhafian  2 , Yang-Soo Kim  1
Affiliations
Review

Comparison of Lateralized Versus Medialized Reverse Total Shoulder Arthroplasty: A Systematic Review and Meta-analysis

Sung-Hyun Cho et al. Orthop J Sports Med. .

Abstract

Background: Reverse total shoulder arthroplasty (rTSA) is an established procedure for cuff tear arthropathy. More lateralized prostheses have been designed to overcome the reported adverse outcomes of Grammont-style rTSA.

Purpose: To compare the clinical and radiological outcomes of medialized and lateralized center of rotation (COR) in rTSA.

Study design: Systematic review; Level of evidence, 3.

Methods: This review followed the PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) guidelines. Included were studies with a level of evidence ≥3 that compared medialized and lateralized rTSA with a minimum follow-up of 12 months. Functional scores including the American Shoulder and Elbow Surgeons (ASES) score and Constant score (CSS), range of motion at final follow-up, gain of external rotation (ER), visual analog scale (VAS) pain score, scapular notching, and heterotopic ossification (HO) were compared. Data were analyzed using random-effects or fixed-effects models in accordance with heterogeneity.

Results: Five retrospective cohort studies and 1 randomized controlled study (n = 594 patients) were included. Lateralized rTSA resulted in greater improvement in ER degree (P < .001), a lower VAS pain score (standardized mean difference [SMD], -0.39; P = .002), and a lower rate of scapular notching (risk ratio [RR], 0.40; P < .001) and HO (RR, 0.52; P < .001). Final forward flexion (SMD, -0.14; P = .629) and ER (SMD, 0.21; P = .238) did not differ significantly between the 2 groups. Overall functional scores, including ASES score (SMD, 0.22; P = .310) and CSS (SMD, 0.37; P = .077), also did not differ significantly (SMD, 0.28; P = .062). The overall complication rate did not differ significantly between the 2 groups (RR, 0.71; P = .339).

Conclusion: Compared with medialized rTSA, lateralized COR rTSA results in greater improvement in ER and the VAS pain score, decreased rates of scapular notching and HO, and no significant changes in functional outcome scores or the complication rate.

Keywords: lateralized; medialized; meta-analysis; reverse total shoulder arthroplasty; systematic review.

PubMed Disclaimer

Conflict of interest statement

The authors declared that they have no conflicts of interest in the authorship and publication of this contribution. AOSSM checks author disclosures against the Open Payments Database (OPD). AOSSM has not conducted an independent investigation on the OPD and disclaims any liability or responsibility relating thereto.

Figures

Figure 1.
Figure 1.
(A) Glenoidal and humeral lateralization relative to the Delta III prosthesis for each implant according to Werthel et al. (B) Comparison of the medialized (M) and lateralized (L) prostheses in each study. *Studies used the Bigliani/Flatow system (Zimmer) for the medialized group and Encore (DJO Global) for the lateralized group, according to Nelson et al. BIO, bony increased offset. Black bar, glenoidal component. Blue bar, humeral component.
Figure 2.
Figure 2.
PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) diagram on article selection process.
Figure 3.
Figure 3.
Forest plots of functional scores. ASES, American Shoulder and Elbow Surgeons score; CSS, Constant score; L, lateralized group; M, medialized group; SMD, standardized mean difference.
Figure 4.
Figure 4.
Forest plot of ranges of motion. ER, external rotation; FF, forward flexion; L, lateralized group; M, medialized group; SMD, standardized mean difference.
Figure 5.
Figure 5.
Forest plot of external rotation gain. L, lateralized group; M, medialized group; SMD, standardized mean difference.
Figure 6.
Figure 6.
Forest plot of VAS pain score. L, lateralized group; M, medialized group; SMD, standardized mean difference; VAS, visual analog scale.
Figure 7.
Figure 7.
Forest plot of scapular notching. L, lateralized group; M, medialized group; RR, risk ratio.
Figure 8.
Figure 8.
Forest plot of heterotopic ossification. L, lateralized group; M, medialized group; RR, risk ratio.
Figure 9.
Figure 9.
Forest plot of the complication rate. L, lateralized group; M, medialized group; RR, risk ratio.
See this image and copyright information in PMC

References

    1. Alentorn-Geli E, Samitier G, Torrens C, Wright TW. Reverse shoulder arthroplasty. Part 2: Systematic review of reoperations, revisions, problems, and complications. Int J Shoulder Surg. 2015;9(2):60–67. - PMC - PubMed
    1. Boileau P, Moineau G, Roussanne Y, O’Shea K. Bony increased-offset reversed shoulder arthroplasty: minimizing scapular impingement while maximizing glenoid fixation. Clin Orthop Relat Res. 2011;469(9):2558–2567. - PMC - PubMed
    1. Boileau P, Watkinson DJ, Hatzidakis AM, Balg F. Grammont reverse prosthesis: design, rationale, and biomechanics. J Shoulder Elbow Surg. 2005;14(1 suppl S):147S–161S. - PubMed
    1. Boulahia A, Edwards TB, Walch G, Baratta RV. Early results of a reverse design prosthesis in the treatment of arthritis of the shoulder in elderly patients with a large rotator cuff tear. Orthopedics. 2002;25(2):129–133. - PubMed
    1. Cho NS, Nam JH, Hong SJ, et al. Radiologic comparison of humeral position according to the implant designs following reverse shoulder arthroplasty: analysis between medial glenoid/medial humerus, lateral glenoid/medial humerus, and medial glenoid/lateral humerus designs. Clin Shoulder Elb. 2018;21(4):192–199. - PMC - PubMed

LinkOut - more resources