NCT02247011

A 5-Year Follow-up Study Investigating Factors Associated With Osteoporotic Fracture in Chinese Postmenopausal Women

A 5-Year Long-term Follow-up Study of a Cross-Sectional Cohort Study (PK-VF) For the Examination of the Association of Vitamin D/Bone Turnover/Bone Mineral Density With an Incident Fracture in Chinese Postmenopausal Women

• Status: Completed
• Phase: N/A
• Study type: Interventional
• Enrollment: 1,100 (actual)
• Sponsor: Peking Union Medical College Hospital · Academic / Other
• Sex: Female
• Age: 50 Years – 108 Years
• Healthy volunteers: Accepted

Summary

This proposed study was designed to investigate the prevalence of a 5-year incident osteoporotic fracture and evaluate the association of a 5-year change of 25-hydroxyvitamin D (25\[OH\]D)/bone turnover makers/bone mineral density (BMD) with the incident fracture in the Chinese postmenopausal women, based on an endeavor of a 5-year post-baseline follow-up visit of a previous cross-sectional study, PK-VF, in which 1724 participants were enrolled and examined.

Detailed description

1. In 2013, 5 years after PK-VF, the same 2070 subjects were contacted by the original sites. Among them 1242 subjects were able to come for the follow-up assessment. 2. Clinical assessments: The participant's bio-information, physical examination and medical history were collected;Questionnaire including social/life style and medical evaluations (years since menopause (YSM), fracture history, milk/yoghourt/coffee/wine intake, calcium intake, or smoking history) were collected by PK-VF investigators. Non-vertebral fracture history evaluation: specific non-vertebral fracture sites include rib or clavicle, forearm, upper arm, hand (including wrist), pelvis, hip, thigh (not including hip), leg, and foot (including ankle). When non-vertebral fractures are suspected, questions were raised to the participant to eliminate possible biases (How did you get these fractures, a slight fall at home, fell from a high place, hit by someone, broken during a car accident or an operation? Did you see a doctor to confirm these fractures?) A fracture occurred in regular daily activities or due to mild trauma was defined as fragile non-vertebral fracture. 3. Biochemical measurements: Fasting blood sample (\~5 ml) was collected from each participant at participating sites; In 2007-2008 study, blood samples were collected during April-July, while in the 5-year follow-up; samples were collected in the same period of time. C-terminal telopeptide of type I collagen (β-CTX), N-aminoterminal prepeptide of type I procollagen (P1NP), and 25 (OH) D will be determined by a laboratory method of electrochemiluminescence (E170; Roche Diagnostics, Basel, Switzerland) in the institute (Peking Union); Chemistry including alkaline phosphatase (ALP), calcium (Ca), creatinine (Cr), and glucose, will be measured by using automated techniques in the institute (Peking Union); 4. BMD measurements: Lumbar spine (LS) and femoral neck (FN) BMDs by dual-energy x-ray absorptiometry (DXA) (Lunar or Norland) at PK-VF sites. BMD calibration: The participant's BMD were evaluated by the same type of DXA as previous. The coefficients of variation of the seven hospitals were 0.75% to 1.7% for LS and 0.56% to 1.0% for FN. Cross-calibration equations between machines are: LS BMD (g/cm\^2) Lunar = 1.012 × Norland + 0.0137 and, FN BMD (g/cm\^2) Lunar = 1.0377 × Norland + 0.00026 5. Vertebral fracture diagnosis: Lateral radiographs of the thoracolumbar spine (T4-L5) were taken at PK-VF sites. Vertebral fractures will be assessed using Genant's semi-quantitative visual criteria. Two specialist radiologists will independently evaluate and diagnose vertebral fracture. A worsened existing vertebral fracture will be regarded as a new vertebral fracture. In 2007-2008 study(Published article about this study could be found in Pubmed, PMID: 24760246), 2070 participants were recruited in this cohort, and 837 subjects (40%) were diagnosed as osteoporosis. After 5 years, 1242 subjects agreed to be re-evaluated in 2013. Questionnaires and blood samples were collected, and BMD and spine x-ray were obtained at the 5-year follow up. We estimate that around 625 subjects would be diagnosed as osteoporosis. The remaining works include blood sample test (25(OH)D, CTX and P1NP),spine x-ray films reading, data input and statistical analysis, paper writing and publication.

Conditions

• Osteoporotic Fractures
• Osteoporosis, Postmenopausal

Interventions

Type	Name	Description
OTHER	Questionaire survey	We used a questionnaireto collect clinical data of the subjects. The questionnaire includes basic data, menstruation and pregnancy, habits and customs, daily activity, common healthy situation, history of drugs and history of factures.
RADIATION	Bone mineral density examination	We use dual energy X-ray absorptiometry (DXA) to exam the BMD at lumbar spine (L2-4, LS) and hip.
RADIATION	Vertebral fracture assessment	X-ray of thoracic and lumbar spine was taken, and the pictures were read by radiological specialists. The diagnosis of vertebral fracture was executed according to Genant's semiquantitative technique.
OTHER	Biochemical markers analysis	Fasting blood sample was collected for each subject. Common biochemical maerkers including serum calcium(Ca), serum phosphate(P), serum glucose(Glu), serum creatinine(Cr), alkaline phosphatase(ALP), alanine aminotransferase(ALT) were analyzed. Besides, we also detect bone speficific markers including 25-hydroxyl Vitamin D(25OHD), parathyroid hormone(PTH), β-isomerized C-terminal telopeptide of type I collagen(β-CTX), N-terminal procollagen of type 1 collagen(P1NP) and osteocalcin(OC).

Timeline

• Start date: 2013-03-01
• Primary completion: 2014-09-01
• Completion: 2016-05-01
• First posted: 2014-09-23
• Last updated: 2016-09-30
• Results posted: 2016-09-30

Locations

1 site across 1 country: China