Application Note | ElastoSens™ Bio
Measuring mechanical properties of breast tissue using ElastoSens™ Bio
Introduction
The breast is a heterogeneous organ composed of adipose, glandular, fibrous tissues, skin, and connective elements such as Cooper’s ligaments. Each of these components contributes to its structural integrity and physiological roles, from supporting lactation to maintaining shape and mobility. The mechanical properties of breast tissue—such as elasticity, stiffness, and viscoelasticity—reflect its microstructure and composition, and they vary with age, hormonal state, and health status. Understanding these characteristics is central not only to biomechanical modeling and implant design but also to clinical applications such as diagnosis and treatment planning. By studying them, scientists and clinicians can better understand how a healthy breast functions, detect early signs of disease, and design therapies that restore or preserve performance.
Key mechanical properties of breast
Elasticity
Elasticity describes the ability of breast tissue to return to its original shape after deformation. It is commonly quantified through Young’s modulus, obtained from stress–strain relationships. Different breast components show distinct elastic behaviors: adipose tissue is relatively soft, while fibroglandular and connective tissues are stiffer. Elasticity is crucial for maintaining breast contour and resilience, and deviations from normal values often signal pathological alterations.
Stiffness
Stiffness reflects the resistance of breast tissue to deformation under applied force. It can be measured in vivo using elastographic imaging or ex vivo through compression and indentation tests. Variations in stiffness across different tissue regions provide valuable insight into structural composition and are used clinically to differentiate between healthy, benign, and malignant tissues. In research, stiffness values guide the design of biomaterials and computational models.
Viscoelasticity
Breast tissues exhibit viscoelastic behavior, meaning they combine both elastic and viscous responses to stress. This property is influenced by the extracellular matrix and collagen-rich structures that impart time-dependent deformation. Viscoelasticity is typically studied through creep, stress-relaxation, or dynamic mechanical analysis, helping researchers capture the complex response of tissues under physiological loads. Accounting for viscoelasticity is essential in modeling how the breast adapts to cyclic stresses, such as those encountered in daily movement.
Anisotropy
The breast has a heterogeneous architecture composed of adipose lobules, glandular ducts, connective tissue, and supporting fibrous septa, resulting in mechanical anisotropy. Its response to stress differs depending on whether loading occurs along ductal orientations, across stromal septa, or within adipose-rich regions. This anisotropy is both structural and functional, influencing how forces are transmitted across the breast during physiological processes such as lactation and pathological processes such as tumor invasion. Accurate recognition of anisotropy is critical for interpreting experimental measurements, improving elastography diagnostics, and developing realistic biomechanical models of breast tissue.
Relationship between diseases and mechanical properties of breast tissue
Breast cancer
Breast cancer significantly alters the mechanical environment of the tissue. Malignant tumors are typically stiffer than surrounding healthy structures, a characteristic exploited by both palpation and elastographic imaging. Changes in elasticity and stiffness arise from increased collagen deposition, altered extracellular matrix organization, and tumor-induced remodeling. These mechanical signatures are not only diagnostic markers but also influence cancer progression by affecting cell migration and invasion.
Breast cancer–related lymphedema
In patients treated for breast cancer, lymphedema can develop due to impaired lymphatic drainage. This condition induces changes in the mechanical properties of skin, subcutaneous fat, and underlying tissues of the affected arm, often manifesting as increased stiffness and altered elasticity. Elastography has emerged as a valuable noninvasive technique to monitor these mechanical changes, offering an objective complement to traditional clinical staging.
Fibrosis and capsular contracture
Pathological stiffening also occurs with fibrosis and post-surgical capsular contracture, where excess collagen and myofibroblast activity increase tissue rigidity. In breast reconstruction and augmentation, these changes compromise implant performance and patient comfort. Mechanical testing and modeling help to characterize these processes and guide the development of more biocompatible and mechanocompatible solutions.
Hormonal and physiological remodeling
Breast tissue undergoes dynamic changes in stiffness and compliance in response to hormonal fluctuations across the menstrual cycle, pregnancy, and lactation. During phases of heightened glandular activity and stromal hydration, the tissue tends to soften, whereas post-lactational involution and age-related remodeling are often accompanied by increased stiffness. Recognizing these physiological variations is essential for interpreting mechanical measurements accurately and for avoiding misclassification of normal changes as pathological.
How breast tissue mechanics are assessed
In Vivo Techniques (Clinics)
In clinical practice, the mechanical properties of breast tissue are most often assessed using elastography techniques. Ultrasound elastography, including strain and shear-wave modalities, is particularly valued because it is safe, real-time, and portable, allowing clinicians to map tissue stiffness during routine imaging. Magnetic resonance elastography (MRE) provides three-dimensional stiffness maps with high resolution, while optical coherence elastography offers additional sensitivity for superficial layers. These approaches build on the long-standing principle of palpation—stiffer regions are often associated with pathology—but translate it into quantitative imaging. By measuring tissue displacement under mechanical stress or induced shear waves, elastography supports early diagnosis, staging of conditions such as breast cancer or lymphedema, and monitoring of treatment response.
Ex Vivo Techniques (Research)
In research environments, excised breast tissues are studied with direct mechanical testing methods to characterize their intrinsic material properties. Common approaches include compression, tensile, and indentation tests, each capturing different aspects of stiffness, elasticity, and viscoelasticity. These methods allow precise determination of parameters such as Young’s modulus, shear modulus, and stress–strain behavior, which are essential for building accurate biomechanical models. Ex vivo testing has been applied to different breast components—adipose tissue, glandular tissue, skin, and connective structures like Cooper’s ligaments—revealing their nonlinear, anisotropic, and time-dependent behavior. Such experiments are critical for understanding disease-related changes, designing implants or scaffolds, and validating computational simulations that predict how the breast deforms under physiological or surgical conditions.
Case study: Breast tissue mechanical characterization with ElastoSens™ Bio
ElastoSens™ Bio: a Contactless Tool for Ex Vivo Tissue Testing
In the field of breast biomechanics, the ElastoSens™ Bio offers an advanced method for ex vivo testing. This instrument enables continuous and non-destructive measurement of viscoelastic properties, ensuring that breast tissue integrity is maintained throughout experimentation. Its technology allows for precise characterization of soft samples and supports repeated testing over time under different environmental conditions, thereby extending the insights available beyond those obtained from conventional mechanical assays.
To demonstrate its applicability, we performed an ex vivo study on breast tissue samples. The following section describes the materials and methods of this experiment, followed by the results, providing a clear example of the instrument’s use in breast tissue research.
Material and Methods
For proof-of-concept, we selected the secondary lean layer of porcine belly, a stratum beneath the skin containing connective tissue and adipose deposits. Subcutaneous adipose is typically arranged in lobules of adipocytes separated by collagenous septa that provide structural reinforcement (Lanzl et al., 2021). Porcine mammary tissue also contains peripheral adipose interspersed with connective elements (Gagné et al., 2025). By isolating the secondary lean layer—highlighting the adipose–fibrous interface while excluding deeper muscle—we obtained a practical analogue for the adipose component of mammary tissue, while recognizing that whole mammary parenchyma includes additional fibroglandular and ductal structures.
Figure 1. Cross-section of porcine belly tissue used as a surrogate for human breast. The arrow indicates the secondary lean layer, located directly beneath the skin and interleaved with subcutaneous fat.
Porcine belly tissue was obtained fresh from a local butcher. The secondary lean layer was carefully dissected to preserve its native architecture. Cylindrical specimens (23 mm internal diameter; variable height) were excised with a biopsy punch and standardized to ~3.0 g in weight before placement into sample holders (Figure 2). To minimize dehydration, samples were stored overnight at 4 °C in phosphate-buffered saline (PBS).
For viscoelastic characterization, specimens were equilibrated in the ElastoSens™ Bio macro holder at 37 °C for 1 hour. Surface PBS was gently removed prior to measurement. The instrument provided real-time values of shear storage modulus (G′) and shear loss modulus (G″). Measurements were repeated across three specimens from distinct anatomical regions of the same porcine cut (n = 3), with results reported as mean ± SD.
Figure 2. Porcine secondary lean layer tissue prepared and loaded into the ElastoSens™ Bio macro holders for non-destructive viscoelastic characterization. The top panel shows the intact tissue sample prior to sectioning, and the bottom panel shows representative portions placed in the holders for testing.
Results and Discussion
The viscoelastic behavior of the porcine secondary lean layer was measured non-destructively using the ElastoSens™ Bio system (Figure 3). The measured shear storage modulus (G′) was 3.35 ± 0.20 kPa, and the shear loss modulus (G″) was 1.45 ± 0.12 kPa (n = 3). Because G′ exceeded G″ across all samples, the tissue behaved predominantly as a solid-like material with a measurable elastic component. This response likely reflects the composite architecture of the secondary lean layer, where adipose tissue provides compliance while fibrous septa and connective elements contribute to structural reinforcement.
The shear storage modulus we obtained is of the same order of magnitude as values reported for porcine subcutaneous adipose tissue. Geerligs et al. (2008) measured G′ = 7.5 kPa at 37 °C under oscillatory shear, highlighting that adipose tissue exhibits soft, viscoelastic behavior in the low-kPa range. While Geerligs and colleagues did not specifically address mammary or breast tissue surrogacy, their findings provide a relevant baseline for adipose mechanics. Within this context, our data suggest that the porcine secondary lean layer, as an adipose-rich composite, could serve as a practical analogue for the adipose contribution to breast tissue mechanics, though differences in fibroglandular content and ductal structures would be expected to alter whole-mammary properties.
Figure 3: Viscoelastic properties of porcine belly secondary lean layer: shear storage modulus (G′) and shear loss modulus (G’’) obtained with the ElastoSens™ Bio non-destructive testing system (mean ± SD, n=3).
Conclusions and Perspectives
The mechanical properties of breast tissue—shaped by elasticity, viscoelasticity, and structural heterogeneity—are central to understanding its physiological roles in support, hormonal responsiveness, and lactation, as well as its pathological remodeling in diseases such as cancer and fibrosis. The present study demonstrates that non-destructive viscoelastic testing with the ElastoSens™ Bio enables reliable quantification of breast-like tissue mechanics, capturing key parameters such as shear storage modulus (G′) and shear loss modulus (G″). This approach provides precise and reproducible data, offering a robust baseline for both biomedical research and translational applications.
Beyond these findings, the ElastoSens™ Bio offers unique advantages for breast and soft-tissue research:
- Simple preparation and setup minimize sample handling and preserve tissue integrity.
- High sensitivity and repeatability allow consistent measurements across different regions, capturing tissue variability that reflects differences in fat, glandular, and stromal composition.
- Cross-species benchmarking facilitates translational studies by comparing porcine models with reported human breast data.
- Platform versatility supports testing of soft tissues, engineered constructs, and biomaterials under identical conditions.
- Controlled incubation and repeated testing enable monitoring of changes in viscoelastic properties over time, whether due to remodeling, treatment, or degradation.
- Engineered tissue applications benefit from non-destructive, repeated measurements that capture the evolving mechanics of living or biofabricated breast constructs.
Taken together, these capabilities position the ElastoSens™ Bio as a powerful tool for advancing our understanding of breast tissue biomechanics, improving cross-species comparisons, and guiding the development of biomaterials, implants, and therapeutic strategies intended to interact with or restore breast function.
References
Hashemi, H. S., Fallone, S., Boily, M., Towers, A., Kilgour, R. D., & Rivaz, H. (2018). Assessment of mechanical properties of tissue in breast cancer-related lymphedema using ultrasound elastography. IEEE transactions on ultrasonics, ferroelectrics, and frequency control, 66(3), 541-550.
Teixeira, A. M., & Martins, P. (2023). A review of bioengineering techniques applied to breast tissue: Mechanical properties, tissue engineering and finite element analysis. Frontiers in Bioengineering and Biotechnology, 11, 1161815.
Semakane, L., Mohan, T. P., Ngwangwa, H., Pandelani, T., & Nemavhola, F. (2024). Mechanical Behaviour of Breast Tissue: An In-Depth Systematic Review.
Ramião, N. G., Martins, P. S., Rynkevic, R., Fernandes, A. A., Barroso, M., & Santos, D. C. (2016). Biomechanical properties of breast tissue, a state-of-the-art review. Biomechanics and modeling in mechanobiology, 15(5), 1307-1323.
Lanzl, F., Duddeck, F., Willuweit, S., & Peldschus, S. (2022). Experimental characterisation of porcine subcutaneous adipose tissue under blunt impact up to irreversible deformation. International Journal of Legal Medicine, 136(3), 897-910.
Gagné, D. H., Steele, C. C., Keating, J., Bradbury, K., Badhwar, A., & Elahi, S. F. (2025). Preliminary study of Yucatan porcine breast morphology: Identifying basic differences and similarities for surgical model applications. Surgeries, 6(1), 11.
Geerligs, M., Peters, G. W., Ackermans, P. A., Oomens, C. W., & Baaijens, F. P. (2008). Linear viscoelastic behavior of subcutaneous adipose tissue. Biorheology, 45(6), 677-688.
Discover how our technology non-destructively measures the viscoelastic properties of soft biomaterials and tissues using micro-volumes of samples
Related Posts
The peritoneal membrane is a thin, semi-permeable tissue whose mechanical behavior is closely tied to its structure, vascular network, and ability to withstand pressure-driven fluid movement. During normal function or during peritoneal dialysis, the membrane is continuously subjected to osmotic gradients, hydrostatic pressures, and shifts in tissue hydration—each of which reveals aspects of its mechanical performance.
The pericardium plays a central role in modulating how the heart fills, moves, and interacts with its surrounding structures. Its mechanical behavior—defined by properties such as elasticity, stiffness, anisotropy, and resistance to bending—helps maintain the heart’s shape, stabilize its position, and distribute load during every cardiac cycle.
The pancreas is a small but complex organ whose function depends not only on biochemical signaling but also on the physical environment of its tissue. Its mechanical properties—such as stiffness, elasticity, and viscoelasticity—are shaped by the structure of the parenchyma and the extracellular matrix.
The aorta is a highly specialized elastic artery designed to buffer the pulsatile output of the heart and maintain smooth, continuous blood flow throughout the body. Its wall is composed of elastin, collagen, smooth muscle cells, and connective tissue arranged in a layered structure that gives rise to complex mechanical behavior.