Clinical Study Of The Correlation Between Hypernormal Body Mass Index And Lumbar Disc Herniation Occurrence

Objective To analyze the Correlation between Body Mass Index (BMI=kg/m~2. normal weight, BMK24; overweight, 28>BMI≥24; Obesity, BMI>28) and LDH occurrence by studing the clinical data of 828 patients in our group , who underwent surgery for Lumbar Disc Herniation (LDH).Methods (1). 828 patients aged from 20-69 years old who were operated on for lumbar disc herniation from January 2001 to January 2007 in Qilu Hospital were divided in to sex and age-specific subgroups, the height, body weight, and the Body Mass Index of each subgroup were caculated, and then compared with the height, body weight and the BMI obtained frm corresponding sex and age-specific subgroups of a large general population from our country and Shandong Province. (1). The sex, age, occupation, history of lumbar injury and the position of LDH of the patients are summed up to analyze the Correlation between these factors and the Body Mass Index. Result (1). In all other age and sex-specific subgroups except in women aged from 20 to 29 years old, the means of BMI of the patients were much bigger than that in the general population in our country. There was significant difference through u test (P <0.01). There was no significant difference in the women aged from 20 to 29 years old through u test (P>0.05). (2). In all age and sex-specific-subgroups, the proportion of people with hypernormal BMI (BMI≥24) was much bigger than that of general populuation in our country. There was significant difference through u test. (P < 0.01) (3). The number of the patients with hypernormal BMI was much bigger than those with normal BMI (BMI < 24) in all age groups except the patients aged from 20 to 29 years old. (4). The proportion of patients with hypernormal BMI exceeded that of normal body weight in other occupation patients except young students. In the young students, the proportion of patients with hypernormal BMI was smaller than that of normal BMI. (5). The history of lumbar injury and the position of LDH was not clearly related to BMI . (6). The proportion of the patients with hypernormal BMI in the male group was bigger than that in the female group. There was statistical difference through x~2 test (P < 0.05).Conclusion Hypernormal BMI (overweight and Obesity ,BMI≥24) may excessively increase the burden of lumbar discs, thus speed up disc degenerating. So it may be an important causal factor of Lumbar Disc Hearniaion. People should pay much attention to controlling body weight in order to keep eligible BMI and prevent Lumbar Disc Hearniaion from occurring.