OBJECTIVETo investigate effect of Activ L total lumbar disc replacement on lumbar sagittal alignment.

METHODSThe imaging data of patients with degenerative disc disease received Activ L total lumbar disc replacement at Department of Orthopedics, Beijing Chao-Yang Hospital, Capital Medical University from March 2009 to March 2013 were retrospectively analyzed. The average age was 45.6 years(range, 35-60 years)and the surgery levels were as follows: L3-4 2 cases, L4-5 15 cases, L5/S1 5 cases, L3-4+ L4-5 3 cases, L4-5+ L5/S1 7 cases. All patients were followed up for 15 to 63 months(average, 32 months). Radiographic parameters such as lumbar lordosis angle(LL), segment lordosis angle(SL) and sacral slope angle(SS) were recorded. All the radiographic parameters were compared using one-way ANOVA at different stage. Lumbar lordosis angle of the two-level was compared with the one of one-level by using independent sample t-test before and after the operation. A partial correction test was carried out to determine the corrections between the parameters preoperatively, one month after the operation and at final follow-up.

RESULTSOne month after the operation, the lumbar lordosis angle decreased by an average of 1.8°, but there was no statistically significant(P>0.05). Compared with one month postoperation, the lumbar lordosis angle increased by an average of 6.8°(P<0.05), which also increased a lot compared with preoperation(P<0.05). The value of segment lordosis angle was rising up from preoperation to the final follow-up(P<0.05), so was the value of sacral slope angle, but there was no statistically significant between different stage(P>0.05). The lumbar lordosis angle showed no significant difference between double-level ones and single-level ones at different stage(P<0.05). The lumbar lordosis angle showed positive correlation with the sacral slope(P<0.001), however, the lumbar lordosis angle showed no corrected with the segment angle all the time(P>0.05).

CONCLUSIONSThe total lumbar disc replacement with Activ L prosthesis had contributed to maintain and improve the lumbar alignment in the short and medium term. Double- or single-level total lumbar disc replacement had no significant effect on the value of lumbar lordosis angle. The lumbar lordosis angle showed positive correlation with the sacral slope all the time with no correlation between lumbar lordosis angle and sacral slope.

Diagnostic Imaging ; Humans ; Intervertebral Disc Degeneration ; surgery ; Lordosis ; diagnostic imaging ; Lumbar Vertebrae ; surgery ; Lumbosacral Region ; surgery ; Postoperative Period ; Prostheses and Implants ; Radiography ; Retrospective Studies ; Total Disc Replacement

OBJECTIVETo identify radiographic predictors of residual low back pain (LBP) after laminectomy for lumbar canal stenosis (LCS).

METHODSClinical results and radiographic findings in 69 patients who underwent single level laminectomy for LCS were retrospectively reviewed. Patients who had an improvement in LBP scores evaluated by Japanese Orthopaedic Association (JOA) scoring system during the follow-up periods were classified as the recovery group, and others were classified as the non-recovery group. Patients'clinical data and radiographic parameters like lordosis angle, range of motion and intervertebral rotational angle were analyzed using binary logistic regression analysis to detect factors significantly related with the occurrence of residual LBP.

RESULTSThe average preoperative JOA score of 14.8+/-5.05 improved to 21.59+/-5.51 at the final follow-up. Binary logistic regression analysis revealed that significant predictors of residual LBP were preoperative lumbar lordosis angle and range of motion.

CONCLUSIONSOur results suggest that patients with flat back and limited lumbar mobility before surgery tend to have poor results in terms of LBP. Therefore, these sagittal radiographic parameters should be taken into account when choosing laminectomy as the surgical option for LCS.

Aged ; Female ; Humans ; Laminectomy ; Low Back Pain ; diagnostic imaging ; Lumbosacral Region ; Male ; Prognosis ; Radiography ; Retrospective Studies ; Spinal Stenosis ; surgery ; Spine ; diagnostic imaging ; Treatment Outcome

OBJECTIVETo analyze the influence of segmental pedicle screws versus hybrid instrumentation on the correction results in adolescent idiopathic scoliosis patients undergoing posterior selective thoracic fusion,

METHODSBy reviewing the medical records and roentgenograms of adolescent idiopathic scoliosis patients who underwent selective thoracic fusion from February 2000 to January 2007 in our hospital, the patients were divided into 2 groups according to different instrumentation fashions: Group A was hook-screw-rod (hybrid) internal fixation type, Group B was screw-rod (all pedicle screws) internal fixation type, and the screws were used in every segment on the concave side of the thoracic curve. The parameters of the scoliosis were measured and the correction results were analyzed,

RESULTSTotally, 48 patients (7 males, 41 females) were included, with an average age of 14.4 years old and a mean follow-up time of 12.3 months. Thirty and 18 patients were assigned to group A and group B, respectively. The mean preoperative coronal Cobb angles of the thoracic curve were 48.8 degrees and 47.4 degrees, respectively. After surgery, they were corrected to 13.7 degrees and 6.8 degrees, respectively. At final follow-up, they were 17.0 degrees and 9.5 degrees, with an average correction rate of 64.6% and 79.0%, respectively, and the correction rate of group B was significantly higher than that of group A (P = 0.003). The mean preoperative coronal Cobb angles of the lumbar curve were 32.6 degrees and 35.2 degrees, respectively. After surgery, they were corrected to 8.6 degrees and 8.3 degrees, respectively. At final follow-up, they were 10.3 degrees and 11.1 degrees, with an average correction rate of 66.8% and 69.9%, respectively, and the correction rate of group B was significantly higher than that of group A (P = 0.003). The correction loss of the thoracic curve and lumbar curve in the 2 groups were 3.1 degrees and 1.8 degrees, 2.4 degrees and 2.4 degrees, respectively. No significant difference was noted (both P > 0.05). The decompensation rate at final follow-up in these 2 groups were 4% (1/25) and 7.1% (1/14) respectively, with no significant difference (P > 0.05).

CONCLUSIONSBoth all pedicle screws and hybrid instrumentation can offer good correction results of the thoracic curve and lumbar curve in posterior selective thoracic fusion in patients with adolescent idiopathic scoliosis. While with all pedicle screws, the correction results of the thoracic curve and lumbar curve are both better than those with hybrid instrumentation without increased decompensation rate.

Adolescent ; Bone Screws ; Child ; Female ; Humans ; Lumbosacral Region ; diagnostic imaging ; pathology ; Male ; Postural Balance ; Radiography ; Retrospective Studies ; Scoliosis ; diagnostic imaging ; pathology ; surgery ; Spinal Fusion ; instrumentation ; methods ; Spine ; diagnostic imaging ; pathology ; surgery ; Thoracic Vertebrae ; diagnostic imaging ; surgery

OBJECTIVETo have a retrospective review of the patients undergoing anterior lumbar interbody fusion (ALIF) with clinical and radiological assessment, and observe changing of graft after procedure and assess correlation between graft collapse and recurrence of radiculopathy.

METHODSSixty-seven consecutive patients undergoing ALIF only at L(4 - 5) with autologous iliac crest graft for intervertebral disc prolapse were followed-up for an average of 14 (2.5 - 32) years. The effect of the fusion was examined by the existence of radiolucent lines and bony continuity on plain radiographs and tomographs, or mobility on flexion-extension radiographs. The disc height was also measured. Lower limb radiculopathy was assessed based on the symptom and examination. Paired samples t-test was used for statistical analysis.

RESULTSSixty-four patients with successful fusion were analyzed (fusion rate: 96%). All measurements in this study were completed by the same author, and the measurement error of more than 2 mm was statistically significant. According to this, graft collapse occurred in 55 patients (86%) and 9 patients (14%) had no graft collapse. In these 55 cases, the original disc height was (12.1 +/- 2.9) mm, increased immediately after the surgery to (16.2 +/- 1.9) mm, however re-narrowed to (12.9 +/- 2.7) mm at the first observation of solid fusion (a mean of 9 months, ranging from 5 to 14 months), which was not significant different compared to the original. There was no significant change in disc height after solid fusion and the disc space at the final follow-up was (12.6 +/- 2.3) mm. There was no radiculopathy observed in 52 cases (95%) during the follow-up.

CONCLUSIONDisc space re-narrowing was observed in most cases after single level ALIF of L(4 - 5), however it was rarely less than the initial and unlikely to result in recurrence of radiculopathy.

Adult ; Equipment and Supplies ; Female ; Follow-Up Studies ; Humans ; Low Back Pain ; surgery ; Lumbar Vertebrae ; diagnostic imaging ; pathology ; surgery ; Lumbosacral Region ; diagnostic imaging ; Male ; Middle Aged ; Radiography ; Recurrence ; Spinal Fusion ; methods ; Spinal Osteophytosis ; surgery ; Time Factors ; Transplantation, Autologous ; methods ; Treatment Outcome

OBJECTIVE: To evaluate the rates of technical success, clinical success, and complications of fluoroscopy-guided lumbar cerebrospinal fluid drainage. MATERIALS AND METHODS: This retrospective study was approved by the Institutional Review Board of our hospital, and informed consent was waived. Ninety-six procedures on 60 consecutive patients performed July 2008 to December 2013 were evaluated. The patients were referred for the fluoroscopy-guided procedure due to failed attempts at a bedside approach, a history of lumbar surgery, difficulty cooperating, or obesity. Fluoroscopy-guided lumbar drainage procedures were performed in the lateral decubitus position with a midline puncture of L3/4 in the interspinous space. The catheter tip was positioned at the T12/L1 level, and the catheter was visualized on contrast agent-aided fluoroscopy. A standard angiography system with a rotatable C-arm was used. The definitions of technical success, clinical success, and complications were defined prior to the study. RESULTS: The technical and clinical success rates were 99.0% (95/96) and 89.6% (86/96), respectively. The mean hospital stay for an external lumbar drain was 4.84 days. Nine cases of minor complications and eight major complications were observed, including seven cases of meningitis, and one retained catheter requiring surgical removal. CONCLUSION: Fluoroscopy-guided external lumbar drainage is a technically reliable procedure in difficult patients with failed attempts at a bedside procedure, history of lumbar surgery, difficulties in cooperation, or obesity.
Adult ; Aged ; Catheters ; *Cerebrospinal Fluid ; Contrast Media ; Drainage/*methods ; Female ; Fluoroscopy/methods ; Humans ; Lumbosacral Region/*radiography/*surgery ; Male ; Middle Aged ; Retrospective Studies ; Spinal Puncture/*methods ; Surgery, Computer-Assisted/methods

BACKGROUND: The prediction of lumbar back muscle degeneration is important because chronic low back pain and spino-pelvic imbalance have been known to be related to it. However, gender difference should be considered because there are different quality and volume of muscles between genders. The purpose of this study was to search for clinical and radiological factors to predict the degree of lumbar back muscle degeneration according to gender difference. METHODS: We reviewed 112 patients (44 men and 68 women) with spinal stenosis who underwent a decompressive surgery between 1 January 2009 and 31 December 2011. Degrees of lumbar back muscle degeneration were classified into three categories by the fatty infiltration at each L3-4 disc level on the axial view of T1 magnetic resonance imaging (MRI). Age, sex, bone marrow density score, and body mass index (BMI) were obtained from chart reviews. Lumbar lordosis, sacral slope, pelvic tilt (PT), and pelvic incidence were calculated with lumbar spine standing lateral radiographs. The degrees of spinal stenosis and facet arthropathy were checked with MRI. Student t-test, chi-square test, or Fisher exact test were used to compare clinical and radiological parameters between genders. Analysis of variance (ANOVA) and linear regression analysis were used to search for a relationship between lumbar back muscle degeneration and possible predictive factors in each gender group. RESULTS: Many clinical and radiological parameters were different according to gender. The age, BMI, and PT in the female group (p = 0.013, 0.001, and 0.019, respectively) and the PT in the men group (p = 0.018) were predictive factors to be correlated with lumbar back muscle degeneration. CONCLUSIONS: The PT was the important predictive factor for lumbar back muscle degeneration in both, the male and the female group. However, age and BMI were predictive factors in the female group only.
Aged ; Back Muscles/*pathology/physiopathology/radiography ; Chronic Disease ; Decompression, Surgical ; Female ; Humans ; Low Back Pain/*diagnosis/physiopathology/surgery ; Lumbosacral Region ; Magnetic Resonance Imaging ; Male ; Middle Aged ; Postural Balance ; Posture ; Predictive Value of Tests ; Retrospective Studies ; Spinal Stenosis/*diagnosis/physiopathology/surgery