Menopause is associated with progressive decline in ovarian estrogen production leading to increased bone turnover and reduction in skeletal mass. Natural menopause usually occurs gradually, allowing partial physiologic adaptation. In contrast, surgical menopause following bilateral oophorectomy causes sudden cessation of ovarian hormone secretion and may precipitate rapid bone loss.

Women undergoing oophorectomy at younger ages for benign gynecological disorders, endometriosis, ovarian cysts, or prophylactic reasons may face long-term consequences including vasomotor symptoms, cardiovascular disease, sexual dysfunction, and osteoporosis. Bone loss after menopause is most pronounced in trabecular-rich sites such as lumbar spine and later affects cortical bone, increasing risk of hip and wrist fractures.

Indian women often have lower baseline calcium intake, reduced sunlight exposure, vitamin D deficiency, and lower peak bone mass, potentially magnifying postmenopausal skeletal risk. Despite this, limited prospective Indian data compare bone outcomes after early surgical menopause with controls.

This study was undertaken to evaluate the effect of early surgical menopause on BMD decline and fracture risk over a three-year follow-up.

Study Design and Setting Prospective observational hospital-based study conducted in the Departments of Obstetrics & Gynecology and Orthopedics of a tertiary teaching hospital from January 2010 to December 2013. Study Population A total of 220 women were enrolled. Group A: Early Surgical Menopause (n=110) Women who underwent bilateral oophorectomy before age 45 years at least 6 months prior to enrollment. Group B: Control Group (n=110) Age-matched women with natural menopause after age 45 years or premenopausal women with preserved ovarian function. Inclusion Criteria • Age 35–50 years • Willing for follow-up for three years • No prior osteoporosis treatment Exclusion Criteria • Chronic kidney disease • Hyperparathyroidism • Steroid therapy >3 months • Rheumatoid arthritis • Malignancy • Thyroid disease uncontrolled • Chronic liver disease Data Collection • Demographics • BMI • Indication for surgery • Time since menopause/oophorectomy • Physical activity • Dietary calcium intake • Smoking/alcohol history • Family history of fracture Investigations • Serum calcium • Phosphorus • Alkaline phosphatase • DEXA scan: lumbar spine (L1–L4), femoral neck • Annual repeat DEXA for 3 years Outcome Measures 1. Change in BMD 2. Development of osteopenia/osteoporosis (WHO criteria) 3. Incident low-trauma fractures Statistical Analysis SPSS version 20 used. p<0.05 considered significant.

Table 1: Baseline Characteristics

Groups were comparable.

Table 2: Baseline Bone Mineral Density

Table 3: Percent BMD Loss at 3 Years

Table 4: WHO Classification at End of Follow-up

Table 5: Fragility Fractures During Follow-up

Hazard ratio for fracture = 2.84 (95% CI 1.03–7.81), p=0.03.

This prospective study demonstrated that women with early surgical menopause had significantly lower baseline BMD and experienced faster decline over three years compared with controls. Fracture incidence was nearly three times higher.

Abrupt estrogen withdrawal increases osteoclast activity and bone resorption. Natural menopause usually occurs gradually, whereas bilateral oophorectomy eliminates ovarian estradiol and androgen production suddenly. This accelerates trabecular bone loss, particularly at the lumbar spine.

Our findings align with prior reports showing increased osteoporosis after premenopausal oophorectomy. Vertebral and wrist fractures predominated, consistent with trabecular bone vulnerability.

These results emphasize the need for preventive care in women undergoing early surgical menopause.

Early surgical menopause significantly accelerates bone mineral density loss and increases fracture risk. Women undergoing bilateral oophorectomy before natural menopause should receive long-term skeletal surveillance and preventive management. Recommendations • Baseline DEXA within 6–12 months after surgery • Calcium and vitamin D supplementation • Weight-bearing exercise • Smoking cessation • Consider hormone replacement therapy where not contraindicated • Anti-resorptive therapy in high-risk women Limitations • Single-center study • Three-year follow-up only • Dietary recall bias possible • Hormone therapy adherence variable Ethical Considerations Institutional Ethics Committee approval obtained. Written informed consent taken from all participants.

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