OBJECTIVE: To evaluate the effectiveness of the single-stage anterior eccentric kyphotic distraction reduction technique (EKD-RT) for treating lower cervical dislocation with locked facet joints, assessing its reduction success rate, neurological improvement, and safety. METHODS: A retrospective analysis was conducted on 67 patients with lower cervical dislocation and locked facet joints (21 unilateral, 46 bilateral) treated between January 2015 and January 2024. There were 39 males and 28 females, with an average age of 49.5 years (range, 22-75 years). The injured segments included C _{3, 4} in 4 cases, C _{4, 5} in 13 cases, C _{5, 6} in 22 cases, and C _{6, 7} in 28 cases. The interval between injury and admission ranged from 2 hours to 2 days (mean, 5.6 hours). Preoperative Frankel grading included grade A in 9 cases, grade B in 28 cases, grade C in 17 cases, grade D in 11 cases, and grade E in 2 cases. Japanese Orthopaedic Association (JOA) score was 7.0±1.4. All patients underwent single-stage anterior cervical discectomy and fusion. Following discectomy at the dislocated level, the EKD-RT was applied to unlock and reduce the locked facet joints, followed by internal fixation. Operation time, blood loss, reduction success rate, and complications were recorded. Interbody fusion status was evaluated using Bridwell criteria. Neurological status was assessed pre- and post-operatively using Frankel grading. Spinal cord function was scored using the 17-point JOA score, and the improvement rate was calculated. RESULTS: Successful reduction of the locked facet joints achieved in all cases. The operation time was 41-85 minutes (range, 63.3 minutes), and intraoperative blood loss was 50-360 mL (range, 125.0 mL). Complications included cerebrospinal fluid leakage in 2 cases; no severe complications such as major vascular injury or recurrent laryngeal nerve injury occurred. All patients were followed up 12-24 months (mean, 17.9 months). At last follow-up, radiological examination confirmed interbody fusion in all patients, with no implant failure or migration. The Frankel grading included grade A in 3 cases, grade B in 9 cases, grade C in 13 cases, grade D in 16 cases, and grade E in 26 cases; the JOA score reached 13.7±2.3; all of which significantly improved compared to preoperative levels ( P<0.05). The improvement rate of JOA score was 66.1%±24.7%. CONCLUSION The EKD-RT is an effective surgical approach for lower cervical dislocation with locked facet joints. It enables safe and efficient reduction of the locked facet joints via a single incision, resulting in significant neurological improvement with a low complication rate.
Humans ; Male ; Middle Aged ; Female ; Cervical Vertebrae/diagnostic imaging* ; Retrospective Studies ; Adult ; Aged ; Zygapophyseal Joint/injuries* ; Joint Dislocations/diagnostic imaging* ; Treatment Outcome ; Spinal Fusion/methods* ; Young Adult ; Kyphosis/surgery*

BACKGROUND: Biportal endoscopic spine surgery (BESS) is a recent addition to minimally invasive spine surgery treatments. It boasts excellent magnification and fine discrimination of neural structures. Selective decompression with preservation of facet joints for structural stability is also feasible owing to access to the spinal canal and foramen deeper inside. This study has a purpose to investigate clinical benefits of BESS for spinal stenosis in comparison to the other common surgical treatments such as microscopic decompression-only (DO) and fusion and instrumentation (FI). METHODS: From December 2013 to March 2015, 30 cases of DO, 48 cases of FI, and 66 consecutive cases of BESS for lumbar spinal stenosis (LSS) were enrolled to evaluate the relative clinical efficacy of BESS. Visual analog scale (VAS) for back pain and leg pain, postoperative hemoglobin, C-reactive protein (CRP) changes, transfusion, and postoperative complications were examined. RESULTS: All the patients were followed up until 6 months, and 98 patients (86.7%) for 2 years. At the 6-month follow-up, VAS for back pain improved from 6.8 to 2.8, 6.8 to 3.2, and 6.8 to 2.8 (p = 0.078) for BESS, DO, and FI, respectively; VAS for leg pain improved from 6.3 to 2.2, 7.0 to 2.5, and 7.2 to 2.5 (p = 0.291), respectively. Two cases in the BESS group underwent additional foraminal decompression, but no fusion surgery was performed. Postoperative hemoglobin changes for BESS, DO, and FI were −2.5, −2.4, and −1.3 mL, respectively. The BESS group had no transfusion cases, whereas 10 cases (33.3%) in DO and 41 cases (85.4%) in FI had transfusion (p = 0.000). CRP changes for BESS, DO, and FI were 0.32, 6.53, and 6.00, respectively, at day 2 postoperatively (p = 0.000); the complication rate for each group was 8.6% (two dural tears and one root injury), 6.7% (two dural tears), and 8.3% (two dural tears and two wound infections), respectively. CONCLUSIONS: BESS for LSS showed clinical results not inferior to those of the other open surgery methods in the short-term. Stable hemodynamic changes with no need for blood transfusion and minimal changes in CRP were thought to cause less injury to the back muscles with minimal bleeding. Foraminal stenosis decompression should be simultaneously conducted with central decompression to avoid an additional surgery.
Back Muscles ; Back Pain ; Blood Transfusion ; C-Reactive Protein ; Constriction, Pathologic ; Decompression ; Discrimination (Psychology) ; Endoscopy ; Follow-Up Studies ; Hemodynamics ; Hemorrhage ; Humans ; Leg ; Lumbar Vertebrae ; Minimally Invasive Surgical Procedures ; Pain, Postoperative ; Postoperative Complications ; Spinal Canal ; Spinal Stenosis ; Spine ; Tears ; Treatment Outcome ; Visual Analog Scale ; Wounds and Injuries ; Zygapophyseal Joint

OBJECTIVE: To compare the visibility and procedural parameters between a standard spinal needle and a new laser-etched needle (LEN) in real-time ultrasonography guided lumbar medial branch access in a phantom of the lumbosacral spine. METHODS: We conducted a prospective single-blinded observational study at a rehabilitation medicine center. A new model of LEN was manufactured with a standard 22-gauge spinal needle and a laser etching machine. Thirty-two inexperienced polyclinic medical students performed ultrasonography-guided lumbar medial branch access using both a standard spinal needle and a LEN with scanning protocol. The outcomes included needle visibility score, needle elapsed time, first-pass success rate, and number of needle sticks. RESULTS: The LEN received significantly better visibility scores and shorter needle elapsed time compared to the standard spinal needle. First-pass success rate and the number of needle sticks were not significantly different between needles. CONCLUSION: A new LEN is expected to offer better visibility and enable inexperienced users to perform an ultrasonography-guided lumbar medial branch block more quickly. However, further study of variables may be necessary for clinical application.
Humans ; Needles* ; Needlestick Injuries ; Observational Study ; Phantoms, Imaging ; Prospective Studies ; Rehabilitation ; Spine ; Students, Medical ; Ultrasonography ; Zygapophyseal Joint

STUDY DESIGN: Radiologic imaging measurement study. PURPOSE: To assess the accuracy of detecting lateral mass and facet joint injuries of the subaxial cervical spine on plain radiographs using computed tomography (CT) scan images as a reference standard; and the integrity of morphological landmarks of the lateral mass and facet joints of the subaxial cervical spine. OVERVIEW OF LITERATURE: Injuries of lateral mass and facet joints potentially lead to an unstable subaxial cervical spine and concomitant neurological sequelae. However, no study has evaluated the accuracy of detecting specific facet joint injuries. METHODS: Eight spinal surgeons scored four sets of the same, randomly re-ordered, 30 cases with and without facet joint injuries of the subaxial cervical spine. Two surveys included conventional plain radiographs series (test) and another two surveys included CT scan images (reference). Facet joint injury characteristics were assessed for accuracy and reliability. Raw agreement, Fleiss kappa, Cohen's kappa and intraclass correlation coefficient statistics were used for reliability analysis. Majority rules were used for accuracy analysis. RESULTS: Of the 21 facet joint injuries discerned on CT scan images, 10 were detected in both plain radiograph surveys (sensitivity, 0.48; 95% confidence interval [CI], 0.26-0.70). There were no false positive facet joint injuries in either of the first two X-ray surveys (specificity, 1.0; 95% CI, 0.63-1.0). Five of the 11 cases with missed injuries had an injury below the lowest visible articulating level on radiographs. CT scan images resulted in superior inter- and intra-rater agreement values for assessing morphologic injury characteristics of facet joint injuries. CONCLUSIONS: Plain radiographs are not accurate, nor reliable for the assessment of facet joint injuries of the subaxial cervical spine. CT scans offer reliable diagnostic information required for the detection and treatment planning of facet joint injuries.
Diagnostic Imaging ; Humans ; Reproducibility of Results ; Spinal Injuries ; Spine* ; Tomography, X-Ray Computed ; Zygapophyseal Joint*

OBJECTIVETo study the effect of vertebrae semi-dislocation on the stress distribution in facet joint and interuertebral disc of patients with cervical syndrome using three dimensional finite element model.

METHODSA patient with cervical spondylosis was randomly chosen, who was male, 28 years old, and diagnosed as cervical vertebra semidislocation by dynamic and static palpation and X-ray, and scanned from C(1) to C(7) by 0.75 mm slice thickness of CT. Based on the CT data, the software was used to construct the three dimensional finite element model of cervical vertebra semidislocation (C(4)-C(6)). Based on the model,virtual manipulation was used to correct the vertebra semidislocation by the software, and the stress distribution was analyzed.

RESULTSThe result of finite element analysis showed that the stress distribution of C(5-6) facet joint and intervertebral disc changed after virtual manipulation.

CONCLUSIONThe vertebra semidislocation leads to the abnormal stress distribution of facet joint and intervertebral disc.

Adult ; Cervical Vertebrae ; injuries ; physiopathology ; Finite Element Analysis ; Humans ; Intervertebral Disc ; physiopathology ; Joint Dislocations ; physiopathology ; Male ; Models, Anatomic ; Stress, Physiological ; Zygapophyseal Joint ; physiopathology

Multiple non-contiguous spinal fracture is a special type of multi-level spinal injury, which is rare but most frequently occur in motor vehicle accident or a falling from a height. We report five patients of multiple non-contiguous spinal fractures. All patients underwent segmental pedicle screws fixation without fusion for preserving facet joints and minimizing blood loss and operation time. We performed necessary operation for any concomitant injuries at the same day.
Humans ; Motor Vehicles ; Spinal Fractures ; Spinal Injuries ; Spine ; Zygapophyseal Joint

Vertebral artery injury may occur following blunt trauma to the cervical spine and can produce severe neurological deficit. We report upon two patients having vertebral artery injury following blunt trauma to the cervical spine. The first one developed a cerebellar infarct and the second cervical cord ischemia. The possibility of vertebral artery injury should be considered in patients with cervical spine injury, especially in those having a subluxation or fracture of the facet joint. Early signs of vertebral artery injury may be silent. Non-invasive techniques, such as magnetic resonance angiography should be utilized in such cases.
Humans ; Ischemia ; Magnetic Resonance Angiography ; Spine* ; Vascular System Injuries ; Vertebral Artery* ; Wounds, Nonpenetrating ; Zygapophyseal Joint

PURPOSE: To evaluate injury patterns of facet joints and associated soft tissue injuries in patients withacute traumatic cervical facet joint injuries. MATERIALS AND METHODS: From among patients with cervical spinetrauma, 27 with facet joint injuries, as seen on CT and MRI, were chosen for this study. CT scans were analyzedwith regard to the location of facet joint injury, the presence or absence of facet dislocation or fracture, andother associated fractures. MR images were analyzed with regard to ligament injury, intervertebral disc injury,intervertebral disc herniation, and spinal cord injury. RESULTS: The most common location of facet joint injurywas C6-7 level(n=10), followed by C5-6(n=8). Among these 27 patients with facet joint injuries, 12(44%) hadbilateral injuries and 15(56%) unilateral injuries. Facet fractures were present in 17 cases(63%) and the fractureof inferior facet was more frequent than superi-or. Patterns of fracture were vertical, transverse, or comminuted,but vertical fracture was the most common. Various degrees of dislocation were observed in patients with facetfractures. Fractures other than facet includ-ed pillar(n=11), lamina(n=6), transverse process(n=14), body(n=13),and spinous process(n=3). On MR im-ages, anterior longitudinal ligament injury was found in 8 patients(30%),posterior longitudinal ligament injury in 4(15%), and interspinous ligament injury in 20(74%). Twelvepatients(44%) had spinal cord injuries includ-ing edema(n=8) and hemorrhage(n=4). Among patients with discabnormalities, 11(41%) had intervertebral disc injuries, and traumatic disc herniations were found in nine. CONCLUSION: Traumatic cervical facet joint injuries were manifested as various patterns and frequentlyassoci-ated with other fractures or soft tissue injuries. Analysis of CT and MR findings of these injury patternshelped formulate a therapeutic plan and determine of prognosis.
Dislocations ; Humans ; Intervertebral Disc ; Ligaments ; Longitudinal Ligaments ; Magnetic Resonance Imaging* ; Prognosis ; Soft Tissue Injuries ; Spinal Cord Injuries ; Spine* ; Tomography, X-Ray Computed ; Zygapophyseal Joint*

PURPOSE: Recently, as traffic and industrial accidents increase year by year, so the incidence of fracture and dislocation of the cervical spine tends to increase. The treatment of this condition is controversial. However, there is increasing tendency to stabilize unstable cervical spine injuries surgically. This study was undertaken to retrospectively analyze the results of surgical treatment of lower cervical spine fracture and dislocation, and to suggest a rational treatment method comparing of surgical approach, bone union, neurologic recovery and clinical symptoms. MATERIAL AND METHODS: Authors studied the medical records and roentgenograms of 48 patients, who were treated surgically for acute fracture and dislocation of the lower cervical spine since January, 1993 to April, 1999. 21 patients were treated by anterior plating and 27 patients were by posterior wiring method. 33 male and 15 female with average age of 38.3 years comprised the group. The most common cause of the injury was traffic accident(35 cases-73%). The most common site of injuries was cervical spine 5-6(20 cases-41%). 6 cases were compressive-flexion(C-F) injuries, 4 cases were vertical-compression(V-C) injuries, 22 cases were distractive-flexion(D-F) injuries, 16 cases were distractive-extension(D-E) injuries according to Allen's Classification. RESULTS: 6 C-F injury patients were treated surgically by 4 anterior approach and 2 posterior approach. All 4 V-C injury patients were by anterior approach. 22 D-F injury patients were by 6 anterior approach and 16 posterior approach. 16 D-E injury patients were by 9 anterior approach and 7 posterior approach. There were 95% radiologic bone union rate in anterior approach and 96% in posterior approach. There was no neurologic recovery in complete spinal cord injury and average 1-2 grade of recovery in incomplete and nerve root injury by Frankel's Classification. The postoperative complication were screw loosening in 1 case, instability on near site of the operation in 2 cases, superficial infection in 1 case. SUMMARY AND CONCLUSION: In the treatment of lower cervical spine fracture and dislocation anterior plating and posterior wiring were same results in bone union rate, neurologic recovery and stability. In flexion injuries with posterior disc herniation, posterior wiring by posterior approach could compressing the spinal cord or nerve root thus anterior discectomy and rigid fixation by anterior approach was necessary. In extension injuries with reduced facet joint dislocation by preoperative traction, anterior approach was effective. In combined fracture of posterior arch of cervical spine, it is difficult to operate posterior approach thus anterior approach was effective. Unreduced posterior facet joint by preoperative traction, posterior approach was effective in reduction and fixation.
Accidents, Occupational ; Classification ; Diskectomy ; Dislocations* ; Female ; Humans ; Incidence ; Male ; Medical Records ; Postoperative Complications ; Retrospective Studies ; Spinal Cord ; Spinal Cord Injuries ; Spine* ; Traction ; Zygapophyseal Joint

PURPOSE: We designed this study to evaluate the incidence of spinal cord injury and the results of surgical treatment of lower cervical spine injury, and to suggest a rational treatment guideline according to the stages of Allen's mechanistic classification of the lower cervical spine injury. MATERIALS AND METHODS: We reviewed the medical records and roentgenograms of 66 patients (49 men and 17 women), who were treated surgically for acute fracture and dislocation of the lower cervical spine since March. 1991 to March. 1996. These patients ranged in age from 17 to 68 years (average age- 38 years). We used Allen's mechanistic classification to analyze fractures in the lower cervical spine injury. We divided neurologic status by complete, incomplete, root injury and no neurologic deficit group, Surgical treatment was performed for those with unstable fracture/dislocation, progressive neurologic deficit with conservative care, neurologic deficit with spinal cord compression by fracture fragment or extruded disc material. Surgical approach was determined according to the site of lesion. We analyzed the surgical treatment results according to neurologic recovery, radiologic bone union and complications, We used chisquare test for statistical analysis of neurologic improvement between the different surgical treatments. RESULTS: Twenty-nine cases were distractive-flexion (DF) phylogeny, 19 cases were compressive-flexion (CF), 2 cases were vertical-compression (VC), 8 cases were compressive-extension (CE), and 8 cases were distractive-extension (DE) phylogeny. For definitive surgical treatments we performed anterior cervical discectomy and fusion (ACDF) in 25, ACDF with anterior stabilizaiton in 30, posterior fusion in 5, and circumferential fusion in 6. There was no neurologic recovery in complete cord injury. There were 32 cases of incomplete cord injury all 8 anterior cord syndromes had no neurologic recovery, among 22 patients with central cord syndrome 18 had neurolgic recovery in various degrees and 2 with Brown-Seguard syndrome showed significant neurologic recovery. In nerve root injury, all patients had complete neurologic recovery. There was no radiologic nonunion at all and it took 10.3 weeks in average for radiologic bone union. There were neurogenic bladder, bed sore, local kyphosis, duodenal ulcer, respiratory infection, persistent neck pain and superficial wound infection in complications. Summary and CONCLUSIONS: In extension (CE, DE) injuries with neurologic deficit, anterior approach should be recommended because the major pathology is located in the anterior structure of the cervical spine. In flexion (DF and CF) injuries with major posterior osteoligamentous disruption, posterior approach could fix the posterior structures. Anterior decompression and fusion should be followed whenever anterior pathology is compressing the spinal cord or nerve root. Posterior open reduction and fusion is necessary whenever there is unreduced facet joint dislocation with or with out neurologic deficit. To prevent the late local kyphosis and persistent neurologic deficit with neck pain after prolonged external immobilization with ACDF, anterior stabilization with a plate and screw system is necessary to augment the surgical treatment of the unstable lower cervical spine injury which necessitates anterior decompression.
Central Cord Syndrome ; Classification ; Decompression ; Diskectomy ; Dislocations ; Duodenal Ulcer ; Humans ; Immobilization ; Incidence ; Kyphosis ; Male ; Medical Records ; Neck Pain ; Neurologic Manifestations ; Pathology ; Phylogeny ; Pressure Ulcer ; Spinal Cord ; Spinal Cord Compression ; Spinal Cord Injuries ; Spine* ; Urinary Bladder, Neurogenic ; Wound Infection ; Zygapophyseal Joint