Ultrasonographic Assessment of Articular Cartilage in Osteoarthritis

Osteoarthritis is characterised by progressive degeneration of articular cartilage, leading to pain, reduced mobility and joint deformity. Early detection of cartilage changes is essential to slow disease progression, yet conventional radiography and standard magnetic resonance imaging often miss subtle surface and biochemical alterations. Ultrasonography offers a non-ionising, real-time and accessible approach to evaluate cartilage integrity. High-frequency probes can resolve cartilage thickness and surface topography, while quantitative parameters such as surface roughness index, reflection coefficient and integrated backscatter reveal microscopic fibrillation and compositional changes. Elastography techniques, including shear-wave and strain imaging, provide measures of tissue stiffness that correlate with proteoglycan content and collagen network integrity. Advances in three-dimensional high-frequency imaging permit volumetric reconstruction of the cartilage–bone interface, enabling detailed assessment of tidemark morphology and subchondral plate alterations. Collectively, these modalities support earlier diagnosis, objective grading and monitoring of osteoarthritic cartilage damage in both research and clinical settings.

Research from Nature Portfolio

Recent studies employing high-frequency ultrasonography have demonstrated sensitivity to both structural and seasonal adaptations in articular cartilage. In a cohort of collegiate athletes, ultrasonographic measurement of anterior femoral cartilage thickness and partial area revealed greater values in players with prior knee injuries compared with uninjured controls, regardless of assessment timing. Moreover, a significant reduction in cartilage thickness and area was observed following a five-month competitive season, highlighting the technique’s capacity to detect dynamic changes associated with loading and injury history. These findings underscore the value of ultrasonography for longitudinal monitoring of cartilage morphology and the influence of mechanical stress in at-risk populations.

Ultrasonographic Assessment of Articular Cartilage in Osteoarthritis publication trend

The graph below shows the total number of articles in ultrasonographic assessment of articular cartilage in osteoarthritis across all publications each year (not limited to Nature Index journals).

Technical terms

Ultrasonography: Imaging technique using high-frequency sound waves to visualise tissue structure in real time.

Surface roughness index (URI): Quantitative measure of cartilage surface irregularity derived from echo duration variations.

Reflection coefficient: Ratio of ultrasound wave intensity reflected at tissue interfaces, indicating changes in acoustic impedance.

Apparent integrated backscatter (AIB): Summed strength of backscattered echoes from within cartilage, reflecting microstructural composition.

Shear-wave elastography: Technique that generates and tracks transverse waves to estimate tissue stiffness in kilopascals.

References

1. Shear wave ultrasound elastography for estimating cartilage stiffness: implications for early detection of osteoarthritis. Med-X (2024).
2. Research progress of ultrasound in accurate evaluation of cartilage injury in osteoarthritis. Frontiers in Endocrinology (2024).
3. 3D High‐Frequency Ultrasound Imaging of Cartilage‐Bone Interface Compared with Micro‐CT. BioMed Research International (2020).
4. Changes in anterior femoral articular cartilage structure in collegiate rugby athletes with and without a history of traumatic knee joint injury following a five-month competitive season. Scientific Reports (2021).