Pectoralis Major Muscle Belly Rupture in a 17-Year-Old Female Softball Player: A Case Report.

CASE: We report the case of a healthy 17-year-old female softball player with a subacute full-thickness intramuscular tear of the pectoralis major (PM) muscle. A successful muscle repair was obtained using a modified Kessler technique. CONCLUSIONS: Despite initially being a rare injury pattern, the incidence of PM muscle rupture is likely to increase as interest in sports and weight training increases, and although this injury pattern is more common in men, it is becoming more common in women as well. Furthermore, this case presentation provides support for operative treatment of intramuscular ruptures of the PM muscle.

Effects of distraction-based distal fixation on pelvic parameter development in early onset scoliosis.

PURPOSE: Prior studies have suggested that distraction-based treatment for early onset scoliosis (EOS) may impede the natural development of the sagittal spinal alignment and pelvic parameters. However, to date no study has investigated the effect of distal fixation on pelvic development. METHODS: Ambulatory children with EOS undergoing index distraction-based treatment with distal fixation below T11 were retrospectively reviewed. Patients with distal fixation to the pelvis were identified and compared to children with Spine-based fixation at T12-L5. Radiographic measurements were performed for coronal and sagittal alignment in addition to pelvic parameters (pelvic incidence (PI), pelvic tilt (PT), and sacral slope (SS) and compared at initial presentation, first erect radiograph, and at 2 years following instrumentation. RESULTS: 33 ambulatory children were identified with a minimum of 2-year follow-up (25 female, average 6.59 ± 2.6 years), with 33% (N = 11) instrumented to the pelvis (54.4% female, average 4.42 ± 2.2 years, initial Cobb 76.1°). Children in the pelvis cohort were significantly younger at treatment initiation (P < 0.001). There was no significant difference in PI at the study time periods, however, there was a significant change in PI between presentation and 2-year follow-up with the pelvic fixation demonstrating a mean 12.3° decrease in PI vs a 3.8° increase in the spine-based cohort (P = 0.027). DISCUSSION: Distal fixation to the pelvis in ambulatory children with EOS treated with growth-friendly instrumentation was associated with a mean decrease in PI of 12.3° that developed over the 2-year treatment duration. Further research is needed to investigate the long-term implications of these findings on pelvic and spinal development.

Polymer, Additives, and Processing Effects on N95 Filter Performance.

The current severe acute respiratory syndrome coronavirus 2 (SARS-COV-2) pandemic has highlighted the need for personal protective equipment, specifically filtering facepiece respirators like N95 masks. While it is common knowledge that polypropylene (PP) is the industry standard material for filtration media, trial and error is often required to identify suitable commercial precursors for filtration media production. This work aims to identify differences between several commercial grades of PP and demonstrate the development of N95 filtration media with the intent that the industry partners can pivot and help address N95 shortages. Three commercial grades of high melt flow index PP were melt blown at Oak Ridge National Laboratory and broadly characterized by several methods including differential scanning calorimetry (DSC), X-ray diffraction (XRD), and neutron scattering. Despite the apparent similarities (high melt flow and isotacticity) between PP feedstocks, the application of corona charging and charge enhancing additives improve each material to widely varying degrees. From the analysis performed here, the most differentiating factor appears to be related to crystallization of the polymer and the resulting electret formation. Materials with higher crystallization onset temperatures, slower crystallization rates, and larger number of crystallites form a stronger electret and are more effective at filtration.

Feasibility of using an inversion-recovery ultrashort echo time (UTE) sequence for quantification of glenoid bone loss.

OBJECTIVE: To utilize the 3D inversion recovery prepared ultrashort echo time with cones readout (IR-UTE-Cones) MRI technique for direct imaging of lamellar bone with comparison to the gold standard of computed tomography (CT). MATERIALS AND METHODS: CT and MRI was performed on 11 shoulder specimens and three patients. Five specimens had imaging performed before and after glenoid fracture (osteotomy). 2D and 3D volume-rendered CT images were reconstructed and conventional T1-weighted and 3D IR-UTE-Cones MRI techniques were performed. Glenoid widths and defects were independently measured by two readers using the circle method. Measurements were compared with those made from 3D CT datasets. Paired-sample Student's t tests and intraclass correlation coefficients were performed. In addition, 2D CT and 3D IR-UTE-Cones MRI datasets were linearly registered, digitally overlaid, and compared in consensus by these two readers. RESULTS: Compared with the reference standard (3D CT), glenoid bone diameter measurements made on 2D CT and 3D IR-UTE-Cones were not significantly different for either reader, whereas T1-weighted images underestimated the diameter (mean difference of 0.18 cm, p = 0.003 and 0.16 cm, p = 0.022 for readers 1 and 2, respectively). However, mean margin of error for measuring glenoid bone loss was small for all modalities (range, 1.46-3.92%). All measured ICCs were near perfect. Digitally registered 2D CT and 3D IR-UTE-Cones MRI datasets yielded essentially perfect congruity between the two modalities. CONCLUSIONS: The 3D IR-UTE-Cones MRI technique selectively visualizes lamellar bone, produces similar contrast to 2D CT imaging, and compares favorably to measurements made using 2D and 3D CT.

Urgent device retrieval using partial left heart bypass.

Percutaneous cardiovascular device implantation plays an important and increasing role in the treatment of congenital heart disease. Device related complications of malposition and embolisation are uncommon and can usually be retrieved by catheter. We present two interesting cases in which migrated devices resulted in thoracic aortic obstruction; both were refractory to percutaneous retrieval. Device retrieval was achieved by thoracotomy and utilising partial left heart bypass because of specific concerns of distal perfusion. Our experience is presented.

A modified approach to sural nerve biopsy: minimizing complications.

The traditional sural nerve biopsy is performed through a distal incision at or just above the ankle. Although a simple procedure, these biopsies are associated with significant morbidity. The authors review the anatomy of the sural nerve, biopsy techniques described in the literature, and potential complications. A modified approach, based on a more proximal incision, and its outcomes are described.

The anatomy of revisions after primary breast augmentation: one surgeon's perspective.

Although breast augmentation is a procedure with a high patient satisfaction rate, at some point in time, some patients will need a revision. A better understanding of what leads to revisions is desirable to determine whether the frequency of revisions can be reduced. With that in mind, we reviewed all revisions in a consecutive series of primary breast augmentation patients operated over a 3-year period with a minimum follow-up of 2 years. The overall revision rate was 10%. The primary indications for revision included 4% malposition (bottoming out), 2% capsular contracture, 2% size change, and 2% switch from saline to silicone. Specific case reports are presented in detail to examine the nature of these revisions.

BRCA mutations and the risk of angiosarcoma after breast cancer treatment.

Post-breast cancer treatment-related angiosarcomas were first observed in lymphedematous extremities after mastectomy and are now being reported with increasing frequency after lumpectomy and radiation. A case history is presented of a BRCA2 carrier who had a postmastectomy chest wall angiosarcoma but had neither therapeutic radiation nor clinically evident lymphedema. The absence of established risk factors led to speculation that the BRCA2 germline mutation could be a causative factor in the development of this patient's angiosarcoma. A literature review supported this concept.

Management of chronic postoperative groin pain.

Postoperative groin pain is a common complaint following surgery of the abdomen and groin. Although this pain usually resolves in the early postoperative period, some experience prolonged, debilitating pain lasting months to years. There is currently a lack of consensus as to the appropriate transition from medical to surgical management of these patients. A retrospective review of 19 consecutive patients with postoperative pain symptoms suspicious for neuropathic origin was undertaken. Neuromas or entrapment of 1 or more nerves was identified in all patients. Improvement of pain and quality of life was reported in 84%, with a minimum 1 year's follow-up. Average preoperative and postoperative pain was 7.6 and 1.2, respectively, a statistically significant reduction. This study confirms high success rates for patients surgically treated for chronic postoperative groin pain when proper selection criteria and appropriate surgical techniques are applied. A management approach is proposed and the surgical technique is described for treatment of these patients.

Risk of angiosarcoma following breast conservation: a clinical alert.

Approximately 100 cases of angiosarcoma following breast-conserving therapy have been reported. The prevalence of angiosarcoma following breast conservation has not been accurately established and optimal treatment has not been defined. The goal of this article is to clarify both issues. The Fisher's exact test was used to compare the prevalence of postirradiation angiosarcoma seen in our private practice to the prevalence reported from the two largest national database studies. A literature review was performed to determine optimal treatment guidelines. The results of the comparison indicated that the prevalence of postirradiation angiosarcoma seen in our practice was significantly higher than that reported in the two national database studies at p-values of 0.0124 and 0.0080. Also, results from the literature review suggest that early detection and aggressive treatment lead to improved outcomes. The data are insufficient to draw firm conclusions, but suggest that the current literature underestimates the prevalence of angiosarcoma following breast-conserving therapy. Since elderly women derive less benefit from radiation and may be more prone to develop postirradiation angiosarcoma, confirmation of our findings could lead to a reappraisal of the management of elderly patients with early stage breast cancer.

Measuring Physicians' Performances and Marketing the RESULTS: A Breast Cancer Model.

The recent transition to managed care has intensified the public's concerns about the quality of medical care. In response, payers, who until recently seemed preoccupied with costs, are demonstrating a renewed interest in value, which in turn could lead to an expansion of negotiations with physicians to include the tracking of such issues as physician performance, patient satisfaction, and patient outcomes. As a response to public concern and demand for accountability, the medical establishment must develop methods to assist payers in estimating relative value of competing medical services. In anticipation of a values transition in their specialty, breast care, the authors established a performance-oriented database which facilitated assessments of their performance in relation to community standards, and enhanced efforts to identify and correct performance deficiencies. Year-end results were summarized in a report-card format that improved marketability. The author's experiences should be of interest to physicians who are attempting to respond to changes in the rapidly evolving medical marketplace.