The Midterm Effectiveness Of K-rod Dynamic Stabilization Systerm In The Treatment Of Single-segmental Lumbar Disc Herniation Of Young People

Objective：To evaluate the midterm effectiveness and lumbar protectionof postoperative lumbar disc herniation of young people withK-rod dynamic stabilization systerm via functional score andimaging examination.Methods:From December2010to July2014,51young patients withsingle-segmental lumbar disc herniation were surgically tr-eated by diskectomy with K-Rod dynamic stabilization syste-rm,including29males,22females,average40.3years old(ran-ge from19～58years old).The patients were followed up ran-ge from1～3years.The JOA score and VAS score were used to evaluate the preoperative,postoperative and midterm changes,the disc space height、intervertebal angle、sagital verteb-rae slip and modic changes of operated segment and adjacentsegment were measured by imaging materials to evaluate theprotection to the spine with K-Rod dynamic stabilization s-ysterm. Results:（1）Preoperatevely the JOA score was14.83±1.75，comparewith the postoperative follow up time score(1month、6mon-ths、1year、2years and3years：23.94±1.47、25±1.23、25.72±1.92、26.25±1.08、26.20±1.64),The JOA score were allobviously improved(P<0.05);Preoperatevely the VAS score was6.75±0.92，compare with the postoperative follow up time score(1month、6months、1year、2years and3years：2.95±0.28、2.00±0.96、1.63±1.33、1.29±0.95、1.20±1.30),The VASscore were all notably reduced(P<0.05).（2）The intervertebral space height changes of operated s-egment and adjacent segment were followed up1month、3mo-nths、6months、1year、2years and3years，the changes ofoperated segment space height score were0.31±1.76、1.18±1.42、0.49±1.63、0.78±1.51、0.14±1.93and0.42±0.83; thechanges of adjacent segment space height score were-0.33±1.56、-0.04±0.71、-1.11±0.95、0.99±1.47、0.59±0.61、-0.12±1.36.（3）Using flextion and extension radiography，the interve-rtebral angle and sagital vertebrae slip of operated segme-nt and adjacent segment were followed up3months、6months、1year、2years and3years;The intervertebral angle degree of operated segement were8.65±1.99、9.98±2.45、9.89±3.41、8.95±3.32、9.96±3.21; The intervertebral angle degreeof a-djacent segement were9.43±3.50、9.61±3.62、11.47±3.50、9.62±5.23、10.77±5.91，respectively compare with pre-operative intervertebrae angle degree(operated segment andadjacent segment:8.43±3.35and8.40±3.96),there is no important significance between follow up time and preoperation(P>0.05); The sagital vertebrae slip of operated segementwere1.36±0.74、1.67±0.86、1.99±0.83、1.71±0.26、1.21±1.27; The sagital vertebrae slip of adjacent-segement were1.28±0.60、1.48±1.35、1.90±0.60、1.48±1.03、2.42±0.87; respectively compare with sagital vertebrae slip (operatedsegmental adjacent segment:1.67±1.42and1.03±1.00),Thetest analysis indicated there is also no important signifi-cance（P>0.05）.（4）Preoperative MRI revealed6cases suffered from endpl-ate inflammation (modic change)，which were all classifi-ed1grade.3cases were all followed up to1year,one of t-he case were followed up to3years.Postoperative MRI indi-cated the modic change were notably improved. Conclusions:The midterm follow up revealed the single segment l-umbar disc herniation of young patients could be treatedwell by K-Rod dynamic stabilization systerm,which couldimprove clinical symptom effectively、prevent degenerati-on of operated and adjacentsegement、maintain lumbar in-stability and promote modic change reversibly.