The variation of cancellous bones at lumbar vertebra, femoral neck, mandibular angle and rib in ovariectomized sheep.
This study aimed to compare the variation of cancellous bones at four skeletal sites: lumbar vertebra, femoral neck, mandibular angle and rib in ovariectomized sheep. Sixteen adult sheep were randomly divided into two groups: eight sheep were ovariectomized served as experimental group; the other eight untreated sheep were served as control group. Bone mineral density was assessed by dual-energy X-ray absorptiometry on lumbar vertebrae at baseline and twelve months after ovariectomy. After 12 months, lumbar vertebrae L3 and L4, femoral necks, mandibular angles and the fourth ribs were harvested for micro-CT scanning, histological analysis and biomechanical test. The results showed that bone mineral density of lumbar vertebra decreased significantly in twelfth month (p<0.05). The results of micro-CT showed that the bone volume/total volume decreased by 45.6%, 36.1% 21.3% and 18.7% in lumbar vertebrae, femoral necks, mandibular angles and ribs in experimental group (p<0.05) respectively. The trabecular number showed the same downtrend (p<0.05). Histological analysis showed trabecular area/tissue area decreased by 32.1%, 23.2% and 20.7% in lumbar vertebrae, femoral necks and mandibular angles respectively (p<0.05), but no significant difference in ribs. Specimens elastic modulus from lumbar vertebra, femoral neck and mandibular angle were 952±76MPa (628±70MPa), 961±173MPa (610±72MPa) and 595±60MPa (444±31MPa) in control group (experimental group) respectively. These datum indicated that the sensibility of cancellous bones to oestrogen deficiency in ovariectomized sheep was site-specific on a pattern as follows: lumbar vertebra, femoral neck, mandibular angle and rib.
State Key Laboratory of Military Stomatology, Department of Oral and Maxillofacial Surgery, School of Stomatology, the Fourth Military Medical University, Xi'an 710032, PR China.
Yongqiang
Y
Zhang
State Key Laboratory of Military Stomatology, Department of Oral and Maxillofacial Surgery, School of Stomatology, the Fourth Military Medical University, Xi'an 710032, PR China.
Yongfeng
Y
Li
State Key Laboratory of Military Stomatology, Department of Orthodontics, School of Stomatology, The Fourth Military Medical University, 145 West Changle Road, Xi'an 710032, Shaanxi, China.
Qi
Q
Gao
State Key Laboratory of Military Stomatology, Department of Oral and Maxillofacial Surgery, School of Stomatology, the Fourth Military Medical University, Xi'an 710032, PR China.
Bo
B
Shao
Department of Oral and Maxillofacial Surgery, PLA 252 Hospital, Baoding, Hebei Province, PR China.
Jianrui
J
Xiao
Department of Oral Implantology, School of Stomatology, Zhengzhou University, Zhengzhou 450052, PR China.
Hong
H
Zhou
Department of Oral and Maxillofacial Surgery, School of Stomatology, the Second Hospital of Hebei Medical University, Shijiazhuang 050000, PR China.
Qiang
Q
Niu
Department of Oral and Maxillofacial Surgery, School of Stomatology, the Second Hospital of Hebei Medical University, Shijiazhuang 050000, PR China.
Mingming
M
Shen
State Key Laboratory of Military Stomatology, Department of Oral and Maxillofacial Surgery, School of Stomatology, the Fourth Military Medical University, Xi'an 710032, PR China.
Baolin
B
Liu
State Key Laboratory of Military Stomatology, Department of Oral and Maxillofacial Surgery, School of Stomatology, the Fourth Military Medical University, Xi'an 710032, PR China.
Kaijin
K
Hu
State Key Laboratory of Military Stomatology, Department of Oral and Maxillofacial Surgery, School of Stomatology, the Fourth Military Medical University, Xi'an 710032, PR China. Electronic address: implant@fmmu.edu.cn.
Liang
L
Kong
D015502:Absorptiometry, Photon; D000818:Animals; D001696:Biomechanical Phenomena; D015519:Bone Density; D005260:Female; D005272:Femur Neck / Q000000981:diagnostic imaging / Q000503:physiopathology*; D008159:Lumbar Vertebrae / Q000000981:diagnostic imaging / Q000503:physiopathology*; D008334:Mandible / Q000000981:diagnostic imaging / Q000503:physiopathology*; D010052:Ovariectomy; D011897:Random Allocation; D012272:Ribs / Q000000981:diagnostic imaging / Q000503:physiopathology*; D034561:Sheep, Domestic; D055114:X-Ray Microtomography
Cancellous bone; Femoral neck; Lumbar vertebra; Mandibular angle; Micro-CT; Osteoporosis; Ovariectomy; Rib; Sheep