Acute Distal Radioulnar Joint Instability: Evaluation and Treatment.

This article reviews the anatomy and mechanics of pronation and supination (axial rotation) of the forearm through the distal radioulnar joint (DRUJ), and the proximal radioulnar joint (PRUJ). Injuries to the bones and/or ligaments of the forearm, wrist, or elbow can result in instability, pain, and limited rotation. Acute dislocations of the DRUJ commonly occur along with a fracture to the distal radius, radial metadiaphysis, or radial head. These injuries are all caused by high-energy trauma. Outcomes are predicated on anatomic reduction and restoration of stability to the DRUJ and PRUJ with or without ligamentous repair or reconstruction.

Identifying Common Peroneal Neuropathy before Foot Drop.

BACKGROUND: Common peroneal neuropathy shares the same pathophysiology as carpal tunnel syndrome. However, management is often delayed because of the traditional misconception of recognizing foot drop as the defining symptom for diagnosis. The authors believe recognizing common peroneal neuropathy before foot drop can relieve pain and help improve quality of life. METHODS: One hundred eighty-five patients who underwent surgical common peroneal neuropathy decompression between 2011 and 2017 were included. The mean follow-up time was 249 ± 28 days. Patients were classified into two stages of severity based on clinical presentation: pre-foot drop and overt foot drop. Demographics, presenting symptoms, clinical signs, electrodiagnostic studies and response to surgery were compared between these two groups. Multivariate regression analysis was used to identify variables that predicted outcome following surgery. RESULTS: Overt foot drop patients presented with significantly lower preoperative motor function (percentage of patients with Medical Research Council grade ≤ 1: overt foot drop, 90 percent; pre-foot drop, 0 percent; p < 0.001). Pre-foot drop patients presented with a significantly higher preoperative pain visual analogue scale score (pre-foot drop, 6.2 ± 0.2; overt foot drop, 4.6 ± 0.3; p < 0.001) and normal electrodiagnostic studies (pre-foot drop, 31.4 percent; overt foot drop, 0.1 percent). Postoperatively, both groups of patients showed significant improvement in quality-of-life score (pre-foot drop, 2.6 ± 0.3; overt foot drop, 2.7 ± 0.3). Patients with obesity or a traumatic cause for common peroneal neuropathy were less likely to have improvements in quality of life after surgical decompression. CONCLUSION: Increased recognition of common peroneal neuropathy can aid early management, relieve pain, and improve quality of life. CLINICAL QUESTION/LEVEL OF EVIDENCE: Risk, II.

Subclinical Peroneal Neuropathy Affects Ambulatory, Community-Dwelling Adults and Is Associated with Falling.

BACKGROUND: Peroneal neuropathy with an overt foot drop is a known risk factor for falling. Subclinical peroneal neuropathy caused by compression at the fibular neck is subtler and does not have foot drop. A previous study found subclinical peroneal neuropathy in 31 percent of hospitalized patients. This was associated with having fallen. The purpose of this study was to determine the prevalence of subclinical peroneal neuropathy in ambulatory adults and investigate if it is associated with falling. METHODS: A cross-sectional study of 397 ambulatory adults presenting to outpatient clinics at a large academic hospital was conducted from 2016 to 2017. Patients were examined for dorsiflexion weakness and signs of localizing peroneal nerve compression to the fibular neck. Fall risk was assessed with the Activities-Specific Balance Confidence Scale and self-reported history of falling. Multivariate logistic regression was used to correlate subclinical peroneal neuropathy with fall risk and a history of falls. RESULTS: The mean patient age was 54 ± 15 years and 248 patients (62 percent) were women. Thirteen patients (3.3 percent) were found to have subclinical peroneal neuropathy. After controlling for various factors known to increase fall risk, patients with subclinical peroneal neuropathy were 3.74 times (95 percent CI, 1.06 to 13.14) (p = 0.04) more likely to report having fallen multiple times in the past year than patients without subclinical peroneal neuropathy. Similarly, patients with subclinical peroneal neuropathy were 7.22 times (95 percent CI, 1.48 to 35.30) (p = 0.02) more likely to have an elevated fall risk on the Activities-Specific Balance Confidence fall risk scale. CONCLUSION: Subclinical peroneal neuropathy affects 3.3 percent of adult outpatients and may predispose them to falling. CLINICAL QUESTION/LEVEL OF EVIDENCE: Risk, III.

Establishment and Characterization of Bacterial Infection of Breast Implants in a Murine Model.

BACKGROUND: Staphylococcus epidermidis and Pseudomonas aeruginosa are the most common causes of Gram-positive and Gram-negative breast implant-associated infection. Little is known about how these bacteria infect breast implants as a function of implant surface characteristics and timing of infection. OBJECTIVES: The aim of this work was to establish a mouse model for studying the impact of various conditions on breast implant infection. METHODS: Ninety-one mice were implanted with 273 breast implant shells and infected with S. epidermidis or P. aeruginosa. Smooth, microtextured, and macrotextured breast implant shells were implanted in each mouse. Bacterial inoculation occurred during implantation or 1 day later. Implants were retrieved 1 or 7 days later. Explanted breast implant shells were sonicated, cultured, and colony-forming units determined or analyzed with scanning electron microscopy. RESULTS: P. aeruginosa could be detected on all device surfaces at 1- and 7- days post infection (dpi), when mice were implanted and infected concurrently or when they were infected 1- day after implantation. However, P. aeruginosa infection was more robust on implant shells retrieved at 7 dpi and particularly on the macrotextured devices that were infected 1 day post implantation. S. epidermidis was mostly cleared from implants when mice were infected and implanted concurrently. Other the other hand, S. epidermidis could be detected on all device surfaces at 1 dpi and 2 days post implantation. However, S. epidermdis infection was suppressed by 7 dpi and 8 days post implantation. CONCLUSIONS: S. epidermidis required higher inoculating doses to cause infection and was cleared within 7 days. P. aeruginosa infected at lower inoculating doses, with robust biofilms noted 7 days later.

Five Financial Pearls for Medical Students, Residents, and Young Surgeons.

BACKGROUND: Finances impact every aspect of our daily lives. Despite this, they are rarely discussed in medical school or surgical training. Consequently, more than half the medical students we interview report no formal teaching about personal finance. The purpose of this article was to present 5 topics every graduating medical student, resident, and young surgeon should understand to start the path to financial independence. METHODS: We synthesized recommendations and data from several books on financial literacy, blogs on the topic, and the personal experiences of the 4 authors. RESULTS: The following 5 topics were identified as critical for young surgeons: learn about and manage your own finances, consider the financial implications of your career choices, make a plan to pay off your student loans, make a budget and stick to it, and think carefully before buying property. Central to these 5 lessons is the idea that starting to invest and save early is essential to taking advantage of interest and capital gains. We also demonstrate pay and cost differences in 5 regions of the country and outline the 2 main pathways one can take to repaying their student loans. CONCLUSIONS: Financial literacy is an important aspect of being an effective surgeon. With minimal effort, you can take these 5 steps now toward financial freedom. Doing so will improve your sense of control over your financial life and decrease anxiety about the unknown.

The Role of the Peripheral Nerve Surgeon in the Treatment of Pain.

Pain is a frequent cause of physician visits. Many physicians find these patients challenging because they often have complicated histories, emotional comorbidities, confusing examinations, difficult problems to fix, and the possibility of factitious complaints for attention or narcotic pain medications. As a result, many patients are lumped into the category of chronic, centralized pain and relegated to pain management. However, recent literature suggests that surgical management of carefully diagnosed generators of pain can greatly reduce patients' pain and narcotic requirements. This article reviews recent literature on surgical management of pain and four specific sources of chronic pain amenable to surgical treatment: painful neuroma, nerve compression, myofascial/musculoskeletal pain, and complex regional pain syndrome type II.

Tissue Expander Complications Do Not Preclude a Second Successful Implant-Based Breast Reconstruction.

BACKGROUND: Implant-based breast reconstruction is the most common method of breast reconstruction in the United States, but the outcomes of subsequent implant-based reconstruction after a tissue expander complication are rarely studied. The purpose of this study was to determine the long-term incidence of implant loss in patents with a previous tissue expander complication. METHODS: This is a retrospective review of the long-term outcomes of all patients with tissue expander complications at a large academic medical center from 2003 to 2013. Patients with subsequent tissue expander or implant complications were compared to those with no further complications to assess risk factors for additional complications or reconstructive failure. RESULTS: One hundred sixty-two women were included in this study. The mean follow-up period was 8.3 ± 3.1 years. Forty-eight women (30 percent) went on to undergo a second tissue expander or implant placement. They did not differ from women who went on to autologous reconstruction or no further reconstruction. Of these, 34 women (71 percent) had no further complications and 38 women (79 percent) had a successful implant-based reconstruction at final follow-up. There were no patient or surgical factors significantly associated with a second complication or implant loss. CONCLUSIONS: Following tissue expander complications, it is reasonable to offer women a second attempt at tissue expansion and implant placement. This study demonstrates that long-term success rates are high, and there are no definitive patient or surgical factors that preclude a second attempt at implant-based breast reconstruction. CLINICAL QUESTION/LEVEL OF EVIDENCE: Risk, III.

Surgical interventions for the treatment of painful neuroma: a comparative meta-analysis.

A consensus on the optimal treatment of painful neuromas does not exist. Our objective was to identify available data and to examine the role of surgical technique on outcomes following surgical management of painful neuromas. In accordance with the PRISMA guidelines, we performed a comprehensive literature search to identify studies measuring the efficacy of the surgical treatment of painful neuromas in the extremities (excluding Morton's neuroma and compression neuropathies). Surgical treatments were categorized as excision-only, excision and transposition, excision and cap, excision and repair, or neurolysis and coverage. Data on the proportion of patients with a meaningful reduction in pain were pooled and a random-effects meta-analysis was performed. The effects of confounding, study quality, and publication bias were examined with stratified, meta-regression, and bias analysis. Fifty-four articles met the inclusion criteria, many with multiple treatment groups. Outcomes reporting varied significantly and few studies controlled for confounding. Overall, surgical treatment of neuroma pain was effective in 77% of patients [95% confidence interval: 73-81]. No significant differences were seen between surgical techniques. Among studies with a mean pain duration greater than 24 months, or median number of operations greater than 2 prior to definitive neuroma pain surgery, excision and transposition or neurolysis and coverage were significantly more likely than other operative techniques to result in a meaningful reduction in pain (P < 0.05). Standardization in the reporting of surgical techniques, outcomes, and confounding factors is needed in future studies to enable providers to make comparisons across disparate techniques in the surgical treatment of neuroma pain.

Selective Nerve Root Transection in the Rat Produces Permanent, Partial Nerve Injury Models with Variable Levels of Functional Deficit.

BACKGROUND: The goal of this study was to develop a partial, nonregenerative nerve injury model in a rat that results in permanently reduced motoneuron numbers and function. This model could serve as a platform for the study of therapeutics, such as a reverse end-to-side nerve transfer (i.e., supercharge). The authors hypothesized that transection of one or more of the L4 to L6 nerve roots supplying the sciatic nerve would cause a permanent reduction in muscle force. METHODS: Rats were randomized into five groups that underwent variations of nerve root transections or sham injury. The L4 to L6 nerve roots were selectively transected and capped to prevent regeneration. Tibial and common peroneal nerves were harvested for quantitative histology and retrograde-labeled to assess the number of motoneurons projecting axons. Muscle force and relative muscle mass were assessed as metrics of postinjury motor function. RESULTS: At 6 months, the number of motoneurons projecting axons and myelinated axon counts were reduced in both the tibial and common peroneal nerves after injury in all groups. Transecting both L4 and L5 or both L4 and L6 reduced motoneuron numbers sufficiently below sham numbers to reduce muscle force and mass in major muscles of the hindlimb innervated by both nerves. Transecting L4 reduced muscle force and mass in common peroneal-innervated muscles, whereas transecting L5 reduced muscle force and mass in tibial-innervated muscles. These findings were stable over time. CONCLUSION: Transection of nerve roots produces stable (time-independent) partial nerve injury models with a selective decrease in motor function.

Resident perceptions on pregnancy during training: 2008 to 2015.

BACKGROUND: Perceptions of residents regarding pregnancy during training were compared over time and across surgical, internal medicine, obstetrics/gynecology, and anesthesia specialties. METHODS: A single-institution survey was distributed to female residents in 2008 and to female and male residents in 2015. Nonparametric comparisons of Likert scale response distributions were performed on the supportiveness for pregnancy of the residency program and childbearing influences of female residents in 2008 and 2015, between specialties for each survey year, and between male and female residents in 2015. RESULTS: The response rates of female residents were 74.8% and 50.5% in 2008 and 2015. In 2015, program directors and division chiefs were perceived to be more supportive of resident pregnancy than in 2008. Surgical residents had lower perceptions of support compared with other specialties. Residents in programs with female leadership perceived a more supportive environment for pregnancy. CONCLUSIONS: Despite persisting negative stigma, residents across specialties report more support for pregnancy.

Axonal Growth Arrests After an Increased Accumulation of Schwann Cells Expressing Senescence Markers and Stromal Cells in Acellular Nerve Allografts.

Acellular nerve allografts (ANAs) and other nerve constructs do not reliably facilitate axonal regeneration across long defects (>3 cm). Causes for this deficiency are poorly understood. In this study, we determined what cells are present within ANAs before axonal growth arrest in nerve constructs and if these cells express markers of cellular stress and senescence. Using the Thy1-GFP rat and serial imaging, we identified the time and location of axonal growth arrest in long (6 cm) ANAs. Axonal growth halted within long ANAs by 4 weeks, while axons successfully regenerated across short (3 cm) ANAs. Cellular populations and markers of senescence were determined using immunohistochemistry, histology, and senescence-associated ß-galactosidase staining. Both short and long ANAs were robustly repopulated with Schwann cells (SCs) and stromal cells by 2 weeks. Schwann cells (S100ß(+)) represented the majority of cells repopulating both ANAs. Overall, both ANAs demonstrated similar cellular populations with the exception of increased stromal cells (fibronectin(+)/S100ß(-)/CD68(-) cells) in long ANAs. Characterization of ANAs for markers of cellular senescence revealed that long ANAs accumulated much greater levels of senescence markers and a greater percentage of Schwann cells expressing the senescence marker p16 compared to short ANAs. To establish the impact of the long ANA environment on axonal regeneration, short ANAs (2 cm) that would normally support axonal regeneration were generated from long ANAs near the time of axonal growth arrest ("stressed" ANAs). These stressed ANAs contained mainly S100ß(+)/p16(+) cells and markedly reduced axonal regeneration. In additional experiments, removal of the distal portion (4 cm) of long ANAs near the time of axonal growth arrest and replacement with long isografts (4 cm) rescued axonal regeneration across the defect. Neuronal culture derived from nerve following axonal growth arrest in long ANAs revealed no deficits in axonal extension. Overall, this evidence demonstrates that long ANAs are repopulated with increased p16(+) Schwann cells and stromal cells compared to short ANAs, suggesting a role for these cells in poor axonal regeneration across nerve constructs.

Subclinical Peroneal Neuropathy: A Common, Unrecognized, and Preventable Finding Associated With a Recent History of Falling in Hospitalized Patients.

PURPOSE: Identification of modifiable risk factors for falling is paramount in reducing the incidence and morbidity of falling. Peroneal neuropathy with an overt foot drop is a known risk factor for falling, but research into subclinical peroneal neuropathy (SCPN) resulting from compression at the fibular head is lacking. The purpose of our study was to determine the prevalence of SCPN in hospitalized patients and establish whether it is associated with a recent history of falling. METHODS: We conducted a cross-sectional study of 100 medical inpatients at a large academic tertiary care hospital in St Louis, Missouri. General medical inpatients deemed at moderate to high risk for falling were enrolled in the summer of 2013. Patients were examined for findings that suggest peroneal neuropathy, fall risk, and a history of falling. Multivariate logistic regression was used to correlate SCPN with fall risk and a history of falls in the past year. RESULTS: The mean patient age was 53 years (SD = 13 years), and 59 patients (59%) were female. Thirty-one patients had examination findings consistent with SCPN. After accounting for various confounding variables within a multivariate logistic regression model, patients with SCPN were 4.7 times (95% CI, 1.4-15.9) more likely to report having fallen 1 or more times in the past year. CONCLUSIONS: Subclinical peroneal neuropathy is common in medical inpatients and is associated with a recent history of falling. Preventing or identifying SCPN in hospitalized patients provides an opportunity to modify activity and therapy, potentially reducing risk.

Alternatives to sural nerve grafts in the upper extremity.

BACKGROUND: The sural nerve is the most common nerve graft donor despite requiring a second operative limb and causing numbness of the lateral foot. The purposes of this study were to review our experience using nerve autografts in upper extremity nerve reconstruction and develop recommendations for donor selection. METHODS: A retrospective case series study was performed of all consecutive patients undergoing nerve grafting procedures for upper extremity nerve injuries over an 11-year period (2001-2012). RESULTS: Eighty-six patients received 109 nerve grafts over the study period. Mean patient age was 42.9 ± 18.3 years; 57 % were male. There were 51 median (59 %), 26 ulnar (30 %), 14 digital (13 %), 13 radial (16 %), and 3 musculocutaneous (4 %) nerve injuries repaired with 99 nerve autografts (71 from upper extremity, 28 from lower extremity). Multiple upper extremity nerve autograft donors were utilized, including the medial antebrachial cutaneous nerve (MABC), third webspace branch of median, lateral antebrachial cutaneous nerve (LABC), palmar cutaneous, and dorsal cutaneous branch of ulnar nerve. By using an upper-extremity donor, a second operative limb was avoided in 58 patients (67 %), and a second incision was avoided in 26 patients (30 %). The frequency of sural graft use declined from 40 % (n = 17/43) to 11 % (n = 7/64). CONCLUSIONS: Our algorithm for selecting nerve graft material has evolved with our growing understanding of nerve internal topography and the drive to minimize additional incisions, maximize ease of harvest, and limit donor morbidity. This has led us away from using the sural nerve when possible and allowed us to avoid a second operative limb in two thirds of the cases.

Epidemiology of upper extremity replantation surgery in the United States.

PURPOSE: Replantation remains an important technique in the management of hand trauma. Given the resources necessary for a successful replantation program, regionalization of replantation care may ultimately be required. The purposes of this study were to analyze the geographic distribution of upper extremity replant procedures, analyze factors of patients undergoing replantation, and characterize the facilities performing these procedures. METHODS: We performed a cohort study using the National Inpatient Sample of the Healthcare Cost and Utilization Project from 2001, 2004, and 2007. Patients with an upper extremity amputation were defined, and a subgroup of patients undergoing replantation was delineated. We analyzed patient demographics and injury characteristics and characteristics of treating facilities. RESULTS: A total of 9,407 patients were treated for upper extremity amputation, 1,361 of whom underwent replantation. Mean age of patients undergoing replantation was 36 years (range, 0-86 y), compared with 44 years (range, 0-104 y) in patients not undergoing replantation. Hospital charges (P < .001) and length of stay (P < .001) were significantly higher for patients with replantations versus those without replantations. Patients treated at teaching facilities were more likely to undergo replantation than those at a non-teaching facility (19% replantation rate at teaching hospitals vs 7% at non-teaching). Large hospitals and urban hospitals were more likely to perform replantation. Self-pay, Medicare, and Medicaid patients all had lower replantation rates than patients with other payer status. CONCLUSIONS: Patients who undergo replantation are younger, incur higher hospital charges, and have longer hospital stays compared with patients who do not undergo replantation. Treatment at large, urban, and teaching facilities is associated with higher replantation rates. Payer status appears to have some bearing on replantation rates. Further studies are needed to better elucidate the relationship between patient and injury characteristics, treatment location, and outcomes, to adequately distribute the finite resources for replantation. TYPE OF STUDY/LEVEL OF EVIDENCE: Economic and Decision Analysis IV.