[Analysis on Harris scores at follow-up after internal fixation of femoral neck fracture].
OBJECTIVE
To investigate the specific variables and influence factors of Harris scores in follow-up data of patients with internal fixation of femoral neck fracture.


METHODS
From May 1999 to May 2004, 99 cases of femoral neck fracture receiving close reduction with cannulated screw and having complete follow-up data were evaluated in terms of age, sex, type of bone fracture (Garden classification), reduction time, reduction quality (Garden indicators), time of full weight-loading, removal of internal fixation, traction before operation, side of bone fracture, necrosis of femoral head, duration of follow-up and Harris score during follow-up period. Univariate and multivariate were analyzed by SPSS14.0 and SAS8.2.


RESULTS
P-P probability plot and normal test revealed the Harris scores were non-normal distribution (W=0.75709, P=0.0001). By nonparametric test in univariate analysis, the following variables in Harris scores were of statistic significance: the time of reduction (U=-2.289, P=0.022), the Garden classification (H=16.943, P=0.001), the time of full weight-bearing (U=3.069, P=0.002), the quality of reduction (U=-3.448, P=0.001) and the necrosis of femoral head (U=-4.723, P=0.000). By the analysis of correlation, the following variables in Harris scores were of statistic significance: Garden classification (r(s)=-0.412, P=0.000), the time of reduction (r(s)=-0.231, P=0.021), the quality of reduction (r(s)=-0.348, P=0.000), the time of full weight-bearing (r(s)=-0.310, P=0.002), and the necrosis of femoral head (r(s)=-0.477, P=0.000). By the univariate logistic regression analysis, the following variables in Harris scores were of statistic significance: Garden classification (P=0.0001), the time of reduction (P=0.0126), the quality of reduction (P=0.0003), the time of full weight-bearing (P=0.0032), the traction before operation (P=0.0492) and the necrosis of femoral head (P=0.0001). By the multivariate logistic regression analysis, the influence factors of Harris scores rank included the necrosis of femoral head (P=0.0001), the time of reduction (P=0.0282), and Garden classification (P=0.0007).


CONCLUSIONS
Harris scores is of non-normal distribution, and the necrosis of femoral head is the most important factor influencing the function after applying internal fixation with cannulated screws to femoral neck fracture.
Ai
Zisheng
Z
Department of Preventive Medicine, Medical College, Tongji University, Shanghai, PR China.
Zhang
Changqing
C
Liu
Yue
Y
Sun
Yuan
Y
Yu
Jinming
J
Wang
Gang
G
Jia
Weitao
W
D000368:Aged; D000369:Aged, 80 and over; D001863:Bone Screws; D005260:Female; D005265:Femoral Neck Fractures / Q000145:classification / Q000601:surgery*; D005500:Follow-Up Studies; D005593:Fracture Fixation, Internal; D017102:Fracture Healing; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D016896:Treatment Outcome