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. 2021 Jan 22;2(1):58-65.
doi: 10.1302/2633-1462.21.BJO-2020-0184. eCollection 2021 Jan.

Clinical results and survivorship of the Mathys Affinis Short, Short Stem Total Shoulder Prosthesis

Timothy James Karssiens  1 , James Ritchie Gill  1 , Karadi Hari Sunil Kumar  2 , Søren Upton Sjolin  1
Affiliations

Clinical results and survivorship of the Mathys Affinis Short, Short Stem Total Shoulder Prosthesis

Timothy James Karssiens et al. Bone Jt Open. .

Abstract

Aims: The Mathys Affinis Short is the most frequently used stemless total shoulder prosthesis in the UK. The purpose of this prospective cohort study is to report the survivorship, clinical, and radiological outcomes of the first independent series of the Affinis Short prosthesis.

Methods: From January 2011 to January 2019, a total of 141 Affinis Short prostheses were implanted in 127 patients by a single surgeon. Mean age at time of surgery was 68 (44 to 89). Minimum one year and maximum eight year follow-up (mean 3.7 years) was analyzed using the Oxford Shoulder Score (OSS) at latest follow-up. Kaplan-Meier survivorship analysis was performed with implant revision as the endpoint. Most recently performed radiographs were reviewed for component radiolucent lines (RLLs) and proximal humeral migration.

Results: Five shoulders underwent revision surgery (3.5%); three for rotator cuff failure, one for infection, and one for component malposition. Survivorship of the implant was 95.4% (95% confidence interval 90.1% to 97.9%) at five and nine years. Mean OSS improved significantly compared to preoperative values from 19.0 (1 to 35) to 43.3 (7 to 48) (p < 0.001). Radiological analysis was undertaken for 99 shoulders. This revealed humeral RLLs in one case (1%), glenoid RLLs in 15 cases (15.2%), and radiological rotator cuff failure in 22 cases (22.2%).

Conclusion: This prospective cohort study shows encouraging short- to mid-term survivorship and clinical and radiological results for the Mathys Affinis Short, Short Stem Total Shoulder Prosthesis.Level of Evidence: IVCite this article: Bone Jt Open 2021;2(1):58-65.

Keywords: Affinis; Outcomes; Short stem humeral prosthesis; Shoulder arthroplasty; Shoulder replacement; Stemless.

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Figures

Fig. 1
Fig. 1
Mathys Affinis Short, Short Stem Total Shoulder Prosthesis.
Fig. 2
Fig. 2
a) Anteroposterior radiograph of the Affinis Short, Short Stem Total Shoulder Prosthesis and b) axillary radiograph of the Affinis Short, Short Stem Total Shoulder Prosthesis in a 72-year-old female patient.
Fig. 3
Fig. 3
Zones of humeral component assessed for radiolucent lines.
Fig. 4
Fig. 4
Kaplan-Meier implant survivorship plot with 95% upper and lower confidence intervals.
Fig. 5
Fig. 5
Box Whisker plot comparing mean and median preoperative and latest available postoperative Oxford Shoulder Scores (mean 3.7 years postoperatively). The p-value was calculated with Wilcoxon signed-rank test.
Fig. 6
Fig. 6
Anteroposterior radiograph showing Lazarus Grade 3 lucency of the glenoid (complete radiolucency (< 2 mm wide) around two pegs) in a 63-year-old female patient, 29 months postoperatively.
See this image and copyright information in PMC

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