[Effect of lumbar manipulation for lumbar disc herniation at different protrusion locations based on Michigan State University grading].

Objective: To study the efficacy of lumbar oblique manipulation in the treatment of lumbar disc herniation with different herniation locations based on MSU classification.

Methods: A total of 272 patients with lumbar disc herniation who were treated from June 2023 to December 2023 were divided into central type group, paracentral type group, and far lateral type group. Among them, there were 73 cases in the central type group, including 41 males and 32 females, with an age of (46.39±6.89) years;161 cases in the paracentral type group, including 88 males and 73 females, with an age of (37.14±5.89) years;and 38 cases in the far lateral type group, including 22 males and 16 females, with an age of (28.56±4.89) years. The visual analogue scale (VAS) and straight leg raising angle of the three groups of patients before treatment, after treatment, and at 1 and 3 months after treatment were recorded, and inter-group, intra-group, and correlation comparisons were made.

Results: A total of 272 patients were followed up, with a follow-up time of (3.0±0.2) months. The VAS score of central type patients after treatment was 2(2, 3) points, which was lower than 4(3, 5) points before treatment, and the difference was statistically significant (P<0.05). There was no statistically significant difference between 1 month and 3 months after treatment and before treatment (P>0.05). The VAS score of paracentral type patients after treatment 2(2, 3) points and 1 month after treatment 3(2, 4) points were lower than that before treatment 5(4, 6) points, and the differences were statistically significant (P<0.05). There was no statistically significant difference in VAS between 3 months after treatment and before treatment (P>0.05). There were no statistically significant differences in VAS scores of far lateral type patients before treatment, after treatment, and at 1 and 3 months after treatment (P>0.05). The straight leg raising angle of central type patients after treatment 64(58, 69) and 1 month after treatment 58(52, 65) were significantly different from that before treatment 44(40, 51) (P<0.05);there was no statistically significant difference between 3 months after treatment and before treatment (P>0.05). The straight leg raising angle of paracentral type patients after treatment 61(55, 67)°, 1 month after treatment 61(53, 66)°, and 3 months after treatment 47(41, 56)° were significantly different from that before treatment 44(36, 52)° (P<0.05). There were no statistically significant differences in the straight leg raising angle of far lateral type patients before treatment, after treatment, and at 1 and 3 months after treatment (P>0.05). There was a correlation between VAS and straight leg raising angle in the three groups of patients, but there was no linear relationship.

Conclusion: Lumbar oblique manipulation has a better effect in treating patients with central and paracentral lumbar disc herniation, but a poor effect in treating far lateral type;after treatment, the curative effect of paracentral type patients lasts longer than that of central type patients.