title: [Anatomic data of the proximal femur and its clinical significance].
abstract: OBJECTIVE
  To measure the anatomic data of the proximal femur and to design an internal fixation instrument aiming at subtrochanteric fracture.
  
  
  METHODS
  We measured the anatomic data of 56 pairs of the matching proximal femur specimens: the diameter of femoral head (HD), the axis length of femoral head (HAL), 135 degree femoral head-neck axis length (HNAL), 135 degree femoral head-neck axis upper length (HNAUL), 135 degree femoral head-neck axis underside length (HNADL), the anterior-posterior axis diameter of femoral neck (NAPD), the upper-underside diameter of femoral neck (NUUD), femoral neck-shaft angle (NFA), femoral shaft lateral cortex-greater trochanter angle (SLGA), the medial-lateral diameter of lesser trochanter level's femoral shaft (LSMLD), the anterior-posterior diameter of lesser trochanter level's femoral shaft (LSAPD), the medial-lateral diameter of 5 cm below lesser trochanter femoral shaft (5 cm MLD), and the anterior-posterior diameter of 5 cm below lesser trochanter femoral shaft (5 cm APD). Part of the data was analyzed and compared.
  
  
  RESULTS
  HD was (46.69+/-3.73) mm, HAL was (39.22+/-4.17) mm, HNAL was (95.45+/-8.16) mm, HNAUL was (84.02+/-7.11) mm, HNADL was (99.95+/-9.34) mm, NAPD was (26.27+/-3.15) mm, NUUD was (32.24+/-3.31) mm, NFA was 126.21 degree+/-7.13 degree, SLGA was 16.38 degree+/-4.04 degree, LSMLD was (31.05+/-3.57) mm, LSAPD was (27.63+/-2.96) mm, 5 cm MLD was (26.36+/-3.22) mm, and 5 cm APD was (25.59+/-2.75) mm. NFA was positively correlated with SLGA (r=0.396, P=0.003).
  
  
  CONCLUSIONS
  It is necessary to design internal fixator to fit the anatomical feature of Chinese femur for the treatment of subtrochanteric fracture, and we should thoroughly consider the angle of the SLGA.
authors.affiliation: Department of Orthopedics, Xiangya Hospital, Central South University, Changsha 410008, China. jamesliang8@yahoo.com.cn
authors.forename: Jieyu
authors.initials: J
authors.lastname: Liang
authors.forename: Kanghua
authors.initials: K
authors.lastname: Li
authors.forename: Qiande
authors.initials: Q
authors.lastname: Liao
authors.forename: Guanghua
authors.initials: G
authors.lastname: Lei
authors.forename: Yihe
authors.initials: Y
authors.lastname: Hu
authors.forename: Yong
authors.initials: Y
authors.lastname: Zhu
authors.forename: Ailan
authors.initials: A
authors.lastname: He
mesh_terms: D000886:Anthropometry; D002102:Cadaver; D004867:Equipment Design; D005270:Femur Head / Q000033:anatomy & histology*; D005272:Femur Neck / Q000033:anatomy & histology*; D005593:Fracture Fixation, Internal / Q000295:instrumentation*; D006620:Hip Fractures / Q000601:surgery*; D006801:Humans