Background
The development and evaluation of tendon and ligament grafts are limited by the absence of comprehensive, directly comparable human reference data. Published studies are fragmented by methodological heterogeneity, restricting objective assessment of graft suitability and comparison of emerging repair technologies. To address this gap, we established the first internally consistent benchmark datasets characterising the morphological, biomechanical, and biochemical properties of major human tendons and ligaments. We propose novel kangaroo derived xenografts as candidate materials aligned with human tissue performance requirements.
Methods
Eight lower limb and eight upper limb human cadaveric specimens were used to characterise nineteen clinically relevant lower limb and thirty-one upper limb tendons and ligaments. All tissues were assessed using standardised protocols measuring morphology, failure load, ultimate tensile strength, elastic modulus, failure strain, and biochemical composition. The resulting data was used to derive quantitative human reference values.
Native kangaroo tendon xenografts were prepared and mechanically and biochemically evaluated using identical testing protocols to enable direct comparison with human tissues.
Results
Distinct, tissue specific morphological, biomechanical, and biochemical profiles were identified across all human tendons and ligaments. Beyond benchmarking, several tendons not routinely harvested for reconstruction were identified with comparable mechanical and compositional properties to standard hamstring grafts, including the fibularis (peroneus) longus and brevis, flexor and extensor hallucis longus, and flexor digitorum longus.
When assessed against this human reference framework, native kangaroo tendons demonstrated markedly superior mechanical performance, with failure loads approximately six times higher than the human ACL, while retaining collagen rich composition and tendon appropriate morphology.
Conclusion/Findings
These datasets provide the first clinically relevant performance reference for human tendons and ligaments across upper and lower limbs. Within this framework, kangaroo-derived substantially exceeds human ligament requirements.
