Reliability of Allen Ferguson classification versus subaxial injury classification and severity scale for subaxial cervical spine injuries: a psychometrics study.

STUDY DESIGN: A psychometrics study. OBJECTIVES: To determine intra and inter-observer reliability of Allen Ferguson system (AF) and sub-axial injury classification and severity scale (SLIC), two sub axial cervical spine injury (SACI) classification systems. SETTING: Online multi-national study METHODS: Clinico-radiological data of 34 random patients with traumatic SACI were distributed as power point presentations to 13 spine surgeons of the Spine Trauma Study Group of ISCoS from seven different institutions. They were advised to classify patients using AF and SLIC systems. A reference guide of the two systems had been mailed to them earlier. After 6 weeks, the same cases were re-presented to them in a different order for classification using both systems. Intra and inter-observer reliability scores were calculated and analysed with Fleiss Kappa coefficient (k value) for both the systems and Intraclass correlation coefficient(ICC) for the SLIC. RESULTS: Allen Ferguson system displayed a uniformly moderate inter and intra-observer reliability. SLIC showed slight to fair inter-observer reliability and fair to substantial intra-observer reliability. AF mechanistic types showed better inter-observer reliability than the SLIC morphological types. Within SLIC, the total SLIC had the least inter-observer agreement and the SLIC neurology had the highest intra-observer agreement. CONCLUSION: This first external reliability study shows a better reliability for AF as compared to SLIC system. Among the SLIC variables, the DLC status and the total SLIC had least agreement. Low-reliability highlights the need for improving the existing classification systems or coming out with newer ones that consider limitations of the existing ones.

Infected charcot spine arthropathy.

BACKGROUND: Charcot spinal arthropathy (CSA), a destructive spinal pathology, is seen in patients with impaired sensation. Superimposed infection in the affected spinal segments can lead to a challenge in the diagnosis and management. Spinal cord injury (SCI) is the leading cause of CSA as persons with SCI have significantly impaired sensation. Though infection of the CSA is rare, SCI persons are prone to superimposed infection of the Charcot spine. We report atypical presentations of three cases of CSA with superimposed infection. CASE DESCRIPTIONS: A 47-year-old male with complete T7-8 SCI developed symptoms suggestive of infection and CSA. He was managed with a posterior vertebral column resection (PVCR) of T12 and intravenous antibiotics as the intraoperative culture showed the growth of E. coli and Pseudomonas. A 26-year-old male with T12 complete paraplegia, post status post open reduction and internal fixation with subsequent implants removal developed infection and CSA over the pseudo-arthrotic lesion with destruction of T12 and L1 vertebrae and an external fistulous track. He was managed with debridement and anterior column T11-L1 reconstruction with a Titanium cage and four-rod pedicle screw stabilization construct. A 25-year-old male with complete paraplegia with CSA at L4-S1. He underwent PVCR of L5 and L3-S2 posterior stabilization. The intraoperative culture and histopathology were suggestive of tuberculous infection. CONCLUSION: Pyogenic or tubercular infection of CSA should be considered as a diagnostic possibility in persons with SCI who are more prone to infections. The management includes aggressive debridement and circumferential fusion along with appropriate medications to control the infection.

Reliability assessment of AOSpine thoracolumbar spine injury classification system and Thoracolumbar Injury Classification and Severity Score (TLICS) for thoracolumbar spine injuries: results of a multicentre study.

PURPOSE: The aim of this multicentre study was to determine whether the recently introduced AOSpine Classification and Injury Severity System has better interrater and intrarater reliability than the already existing Thoracolumbar Injury Classification and Severity Score (TLICS) for thoracolumbar spine injuries. METHODS: Clinical and radiological data of 50 consecutive patients admitted at a single centre with a diagnosis of an acute traumatic thoracolumbar spine injury were distributed to eleven attending spine surgeons from six different institutions in the form of PowerPoint presentation, who classified them according to both classifications. After time span of 6 weeks, cases were randomly rearranged and sent again to same surgeons for re-classification. Interobserver and intraobserver reliability for each component of TLICS and new AOSpine classification were evaluated using Fleiss Kappa coefficient (k value) and Spearman rank order correlation. RESULTS: Moderate interrater and intrarater reliability was seen for grading fracture type and integrity of posterior ligamentous complex (Fracture type: k = 0.43 ± 0.01 and 0.59 ± 0.16, respectively, PLC: k = 0.47 ± 0.01 and 0.55 ± 0.15, respectively), and fair to moderate reliability (k = 0.29 ± 0.01 interobserver and 0.44+/0.10 intraobserver, respectively) for total score according to TLICS. Moderate interrater (k = 0.59 ± 0.01) and substantial intrarater reliability (k = 0.68 ± 0.13) was seen for grading fracture type regardless of subtype according to AOSpine classification. Near perfect interrater and intrarater agreement was seen concerning neurological status for both the classification systems. CONCLUSIONS: Recently proposed AOSpine classification has better reliability for identifying fracture morphology than the existing TLICS. Additional studies are clearly necessary concerning the application of these classification systems across multiple physicians at different level of training and trauma centers to evaluate not only their reliability and reproducibility, but also the other attributes, especially the clinical significance of a good classification system.