Impact of Early Surgical Menopause on Bone Mineral Density and Fracture Risk: A Prospective Study
Background: Surgical menopause caused by bilateral oophorectomy before the natural age of menopause leads to abrupt estrogen deprivation. Estrogen plays a crucial role in maintaining bone remodeling balance by inhibiting osteoclastic bone resorption and preserving bone mineral density (BMD). Women undergoing early surgical menopause may therefore experience accelerated bone loss and increased fracture risk compared with women attaining natural menopause. Aim: To evaluate the impact of early surgical menopause on bone mineral density and incident fracture risk in women followed prospectively for three years. Materials and Methods: This prospective hospital-based study included 220 women aged 35–50 years. Group A comprised 110 women who underwent bilateral oophorectomy with or without hysterectomy before age 45 years. Group B included 110 age-matched women with natural menopause or regular ovarian function. Baseline and annual assessments included dual-energy X-ray absorptiometry (DEXA) of lumbar spine and femoral neck, serum calcium, alkaline phosphatase, and fracture surveillance. Statistical analysis was performed using t-test, chi-square test, repeated measures ANOVA, and Cox regression. Results: At baseline, mean lumbar spine BMD was significantly lower in Group A than Group B (0.918 ± 0.11 vs 0.982 ± 0.10 g/cm², p<0.001). At three years, mean decline in lumbar spine BMD was 8.6% in Group A versus 3.1% in Group B (p<0.001). Osteoporosis developed in 29.1% of Group A compared with 11.8% of Group B. Fragility fractures occurred in 14 women (12.7%) in Group A and 5 women (4.5%) in Group B (HR 2.84; 95% CI 1.03–7.81). Conclusion: Early surgical menopause is associated with accelerated bone loss and significantly increased fracture risk. Timely screening, calcium-vitamin D supplementation, lifestyle intervention, and hormone therapy where appropriate may reduce skeletal morbidity.