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. 2018 Dec 1;21(4):192-199.
doi: 10.5397/cise.2018.21.4.192. eCollection 2018 Dec.

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

Nam Su Cho  1 , Ju Hyun Nam  1 , Se Jung Hong  1 , Tae Wook Kim  1 , Myeong Gu Lee  1 , Jung Tae Ahn  1 , Yong Girl Rhee  1
Affiliations

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

Nam Su Cho et al. Clin Shoulder Elb. .

Abstract

Background: The currently available reverse shoulder arthroplasty (RSA) designs can be classified into medial glenoid/medial humerus (MGMH), lateral glenoid/medial humerus (LGMH), and medial glenoid/lateral humerus (MGLH) prosthesis designs. The purpose of this study was to radiologically analyze the effect of different RSA designs on humeral position following RSA.

Methods: A total of 50 patients who underwent primary RSA were retrospectively analyzed. Among 50 patients, 33 patients (group A: MGMH) underwent RSA with Aequalis system (Wright, Inc, Bloomington, MN, USA), 6 (group B: LGMH) with Aequalis system using bony increased offset, and 11 (group C: MGLH) with Aequalis Ascend Flex system. The acromiohumeral distance, acromioepiphyseal distance (AED), lateral humeral offset (LHO), LHO from the center of rotation (LHOCOR), and deltoid length were radiologically measured to quantify the distalization and lateralization of the humerus.

Results: The increment in postoperative AED was 19.92 ± 3.93 mm in group A, 24.52 ± 5.25 mm in group B, and 25.97 ± 5.29 mm in group C, respectively (p=0.001). The increment in postoperative LHO was 0.13 ± 6.30 mm, 8.00 ± 12.14 mm, and 7.42 ± 6.88 mm, respectively (p=0.005). The increment in postoperative LHOCOR was 20.76 ± 6.06 mm, 22.04 ± 5.15 mm, and 28.11 ± 4.14 mm, respectively (p=0.002).

Conclusions: The radiologic analysis of the effect of different RSA designs on humeral position following RSA showed significant differences in the increment in postoperative AED, LHO, and LHOCOR between the 3 groups. Therefore, MGLH design seems to be more effective for humeral distalization and lateralization compared to original Grammont design.

Keywords: Cuff tear arthropathy; Implant design; Massive rotator cuff tear; Reverse shoulder arthroplasty; Shoulder.

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Conflict of interest statement

Conflict of interest None.

Figures

Fig. 1.
Fig. 1.
Preoperative (A) and postoperative (B) acromiohumeral distance (AHD).
Fig. 2.
Fig. 2.
Preoperative (A) and postoperative (B) acromioepiphyseal distance (AED).
Fig. 3.
Fig. 3.
Preoperative (A) and postoperative (B) lateral humeral offset (LHO). AHD: acromiohumeral distance.
Fig. 4.
Fig. 4.
Preoperative (A) and postoperative (B) lateral humeral offset from the center of rotation (LHOCOR). AHD: acromiohumeral distance.
Fig. 5.
Fig. 5.
Preoperative (A) and postoperative (B) deltoid length.
See this image and copyright information in PMC

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