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Related Experiment Video

Updated: Feb 8, 2026

Author Spotlight: Development and Evaluation of a Compound Acne Rodent Model Using C. acnes and Oleic Acid

Author Spotlight: Development and Evaluation of a Compound Acne Rodent Model Using C. acnes and Oleic Acid

Published on: November 1, 2024

Cutibacterium acnes and the shoulder microbiome.

Boyang Qiu¹, Kait Al², Ana M Pena-Diaz³

¹Schulich School of Medicine and Dentistry, Western University, London, ON, Canada.

Journal of Shoulder and Elbow Surgery

|June 18, 2018

Summary

Microbial DNA, including Cutibacterium acnes, was not found in shoulder tissues other than skin. This suggests shoulder infections originate from skin contamination, not internal bacterial populations.

Keywords:

Cutibacterium acnes Microbiome arthroplasty complication infection rotator cuff shoulder

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Last Updated: Feb 8, 2026

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Area of Science:

Microbiology
Genomics
Orthopedic Surgery

Background:

Modern DNA sequencing reveals microbial presence in previously sterile tissues.
Investigating the origins of Cutibacterium acnes (C. acnes) shoulder infections is crucial.

Purpose of the Study:

To identify the source of Cutibacterium acnes in shoulder infections.
To understand the shoulder microbiome composition.

Main Methods:

Collected tissue samples from skin, fat, tendon, ligament, and cartilage during shoulder arthroplasty.
Performed 16S ribosomal RNA gene sequencing on extracted microbial DNA.
Analyzed sequencing data to quantify and statistically assess microbial presence.

Main Results:

Acinetobacter species and Oxalobacteraceae DNA found in 74% of rotator cuff tendons.
Cutibacterium acnes DNA detected only in the skin of one patient.
No C. acnes DNA identified in any other shoulder tissues.

Conclusions:

A low-abundance microbiome exists in rotator cuff and other shoulder tissues.
Absence of C. acnes in shoulder tissues supports a skin contamination source for infections.
Findings challenge the theory of opportunistic expansion of resident C. acnes within the shoulder joint.