Iatrogenic burn caused by an operating microscope: case report.

We present a patient who experienced a burn from an operating microscope during surgery for a brachial plexus birth palsy, a literature review, and recommendations on how to avoid such injuries.

The intrarater and interrater reliability of glenoid version and glenohumeral subluxation measurements in neonatal brachial plexus palsy.

BACKGROUND: Progressive and disabling glenohumeral dysplasia commonly occurs as a secondary deformity in children with neonatal brachial plexus palsy (NBPP). A number of methods for quantifying glenohumeral dysplasia are currently in use; however, the most commonly reported quantitative measures have yet to be validated. The present study assesses the intrarater and interrater reliability of the glenoid version angle (GVA) and percent of the humeral head anterior to the scapular line (PHHA) measurements on axial magnetic resonance images. METHODS: Axial magnetic resonance images of the shoulder girdle of 25 children with NBPP were selected to represent a wide range of glenohumeral dysplasia severity. An axial image was preselected for each measurement. Six examiners (3 orthopaedic surgeons, 2 musculoskeletal radiologists, and an epidemiologist) digitally measured the GVA and PHHA on each image twice, with each measurement separated by 2 to 14 days and the order of image presentation placed in a different arrangement for each measurement set. Intrarater and interrater reliability was assessed with the intraclass correlation coefficient (ICC). Measurement errors for the GVA and PHHA measurements and the variances associated with the scapular and glenoid lines were calculated. RESULTS: Using the Fleiss criteria, intrarater reliability was excellent, with ICCs averaging 0.909 (95% CI: 0.840, 0.940) for GVA and 0.891 (95% CI: 0.815, 0.921) for PHHA. Interrater reliability was excellent, with ICCs of 0.848 (95% CI: 0.788, 0.909) for GVA and 0.874 (95% CI: 0.815, 0.934) for PHHA. The GVA and PHHA measurement errors were ±6.4 degrees and ±7.2%, respectively. In a subset of 141 images measured, the between-image variance in the scapular line was greater than the glenoid line by a 1.61:1 ratio. CONCLUSIONS: : The present study demonstrates excellent intrarater and interrater reliability of standard measurements of glenohumeral dysplasia in NBPP. The measurement errors for both measurements were comparable with other standard measures (e.g., Cobb angle). The scapular line exhibited a greater variance than the glenoid line, which identifies an opportunity for improvement in the GVA measurement. LEVEL OF EVIDENCE: Diagnostic study; level III.

The Accuracy of Common Hand Injections With and Without Ultrasound: An Anatomical Study.

BACKGROUND: The aim of the study is to determine the accuracy of hand injections with and without the aid of ultrasound (U/S) into the carpal tunnel, thumb carpometacarpal (CMC) joint, first dorsal compartment (DC) and the radiocarpal (RC) joint. METHODS: Four participants of various level of experience injected the carpal tunnel, thumb CMC, first DC, and RC joint into 40 fresh frozen cadaver specimens with blue dye and radiographic contrast. Participants 1 and 2 were injected without U/S guidance, and participants 3 and 4 were injected with U/S guidance. A successful injection was determined by both fluoroscopy and dissection/direct observation. Additional information was recorded for each injection such as median nerve infiltration and evidence of thumb CMC arthrosis. RESULTS: The overall accuracy for carpal tunnel, thumb CMC, first DC, and RC injections were 95%, 63%, 90%, and 90%, respectively. Success was compared with and without U/S guidance. Success rates were similar for each injection site, except the thumb CMC joint, where U/S participants had 25% higher accuracy. In the setting of thumb CMC arthrosis, the incidence of success was 38% for participants with no U/S aid and 72% for participants with U/S aid. There was a significant difference between participants who used U/S with the participant with more U/S experience being more successful. CONCLUSION: Carpal tunnel, first DC, and RC injections had an accuracy of greater than 90%. Thumb CMC injections have a lower accuracy (63%) and one can improve accuracy with U/S. The accuracy of U/S-guided injections is dependent on the user and their experience.

Prognosis following neonatal brachial plexus palsy: an evidence-based review.

PURPOSE: The spontaneous recovery rate of neonatal brachial plexus palsy (NBPP) is often cited as 75-95%. However, recent reports have found the recovery rate to be much lower. The purpose of this study was to perform an evidence-based review aimed at summarizing the available English language information regarding prognosis following NBPP based on the Narakas classification. METHODS: A Medline database search was performed to identify articles that focused on the natural history, outcome, prognosis, or conservative treatment of neonatal brachial plexus birth injury from 1966 to 2006. Twenty-four articles were identified. The articles were graded according to the Oxford Evidence Based Grading Scale and data regarding sample size, follow up, study purpose, Narakas grouping, Mallet scale, and recovery of function at 3 and 6 months were extracted. Of the 24 articles, 11 were included for review. Data analysis included odds ratios and percent recovery. RESULTS: Of the 11 studies, only one was given a grade of a Level I study, three were given a grade of Level II, and seven were given a grade of Level IV. Sixty-four percent of infants classified as Narakas I and II had spontaneous recovery of biceps function at 3 months of age and only 9% of the Narakas III and IV group had recovery. Sixty-five percent of the Narakas I and II group had complete recovery at 6 months of age and only 14% of the Narakas III and IV group had recovery. The odds of biceps recovery at 3 months of age for the Narakas I and II group was 19 times higher compared to the III and IV group. The odds of complete recovery were 11 times higher for the Narakas I and II group compared to the III and IV group. CONCLUSION: The quality of the literature regarding the prognosis of neonatal brachial plexus injury is poor. Based on the Narakas classification, recovery better for NBPP classified as Narakas I and II.