Musculoskeletal biomarkers in health and disease: implications for the aging spine-a review for spinal surgeons by the SRS adult spinal deformity task force on senescence.

The incidence of spine-related pathologies is expected to increase in developed countries due to ongoing fundamental demographic shifts toward an older population. These changes present significant challenges to public health, as healthcare systems worldwide must confront the burden of musculoskeletal aging and its related consequences. Here, we synthesize current knowledge on the biologic mechanisms underlying musculoskeletal aging, focusing on the implications for the aging spine. The complexity of the aging process, characterized by a convoluted interplay between genetic, environmental, and lifestyle factors, necessitates a comprehensive understanding of the biologic processes and reliable methods of surveying biologic states to inform effective diagnostic, predictive, and prognostic strategies. Biomarkers emerge as invaluable tools in this domain, offering insights into the early detection, risk assessment, and targeted intervention for age-related musculoskeletal decline. This review highlights various biomarker types including diagnostic, predictive, and prognostic, and explores their distinct roles in enhancing our understanding of musculoskeletal aging. Navigating the interconnected landscape of cellular senescence, sarcopenia, osteoporosis, and frailty, this review underscores the critical importance of developing personalized care approaches for the aging population. By identifying and integrating functional biomarkers, researchers and clinicians can elucidate the underlying mechanisms and devise tailored strategies to alleviate the musculoskeletal decline associated with the aging process. We envision an "active surveillance" future where biomarkers of musculoskeletal aging are integrated into clinical practice, empowering clinicians to make proactive, data-driven decisions that improve spine health for older adults.