Patient-specific Guides Using 3-dimensional Reconstruction Provide Accuracy and Reproducibility in Reverse Total Shoulder Arthroplasty

• Published in: Clinics in Shoulder and Elbow Vol. 22; no. 1; pp. 16 - 23
• Main Authors: Yoon, Jong Pil, Kim, Dong Hyun, Jung, Jae Wook, Lee, Chang-Hwa, Min, Seunggi, Lee, Hyun Joo, Kim, Hee-June
• Format: Journal Article
• Language: English
• Published: Korea (South) 대한견주관절의학회 01.03.2019; Korean Shoulder and Elbow Society
• Subjects: glenoid component; humeral component; Original; patient-specific guide; positioning; reverse total shoulder arthroplasty; Positioning; Glenoid component; Patient-specific guide; Humeral component; Reverse total shoulder arthroplasty
• ISSN: 2383-8337; 2288-8721
• DOI: 10.5397/cise.2019.22.1.16

We aimed to evaluate whether the use of our novel patient-specific guide (PSG) with 3-dimensional reconstruction in reverse total shoulder arthroplasty (RTSA) would allow accurate and reliable implantation of the glenoid and humeral components. 20 fresh-frozen cadaveric shoulders were used. The PSG group (n=10) and conventional group (n=10) was evaluated the accuracy and reproducibility of implant positioning between before and after surgery on the computed tomography image. The superoinferior and anteroposterior offset in the glenoid component were 0.42 ± 0.07, 0.50 ± 0.08 in the conventional group and 0.45 ± 0.03, 0.46 ± 0.02 in the PSG group. The inclination and version angles were -1.93° ± 4.31°, 2.27° ± 5.91° and 0.46° ± 0.02°, 3.38° ± 2.79°. The standard deviation showed a smaller difference in the PSG group. The anteroposterior and lateromedial humeral canal center offset in the humeral component were 0.45 ± 0.12, 0.48 ± 0.15 in the conventional group and 0.46 ± 0.59 ( =0.794), 0.46 ± 0.06 ( =0.702) in the PSG group. The PSG showed significantly better humeral stem alignment. The use of PSGs with 3-dimensional reconstruction reduces variabilities in glenoid and humerus component positions and prevents extreme positioning errors in RTSA.