Casey M O'Connor

• Doctor of Medicine
• Orthopaedic Surgeon at OrthoCarolina Matthews

Background Frailty can predict adverse outcomes for multiple medical conditions and surgeries, but is not well-studied in total hip arthroplasty (THA). We evaluate the association between Hospital Frailty Risk Score (HFRS) and postoperative events and costs after primary THA. Methods Using the National Readmissions Database, we identified primary...

With the annual incidence of hip fractures and hip fracture fixation rising, the need for conversion total hip arthroplasty has also risen. About half of the 280,000 hip fractures that occur annually in the United States are extracapsular. Commonly extracapsular hip fractures are treated with either cephalomedullary nails (CMNs) or sliding hip scre...

Background: Frailty has been associated with poor postoperative outcomes in various medical conditions and surgical procedures. However, the relationship between frailty and outcomes after primary total knee arthroplasty (TKA) has not been well-described. This study investigated the association of the Hospital Frailty Risk Score (HFRS) with postop...

Background: Lateral column lengthening (LCL) is a surgical procedure used to manage forefoot abduction and, in theory, also increases the longitudinal arch by plantarflexion of the first ray through tensioning the peroneus longus for patients with stage IIB adult acquired flatfoot deformity (AAFD). This procedure utilizes an opening wedge osteotom...

Background: We analyzed association between viewing two-dimensional computed tomography (2D CT) images in addition to radiographs with radial head treatment recommendations after accounting for patient and surgeon factors in a survey-based experiment. Methods: One hundred and fifty-four surgeons reviewed 15 patient scenarios with terrible triad...

Background Pyogenic spine infections (PSIs) are challenging to diagnose and treat. People who inject drugs (PWID) are at increased risk and contribute to rising PSI incidence. Objective To analyze trends and characterize PSI in persons who do and do not inject drugs in northeast New York State (NYS), a predominantly rural region. Methods A retros...

»: A small yet growing subset of total joint arthroplasty (TJA) candidates are diagnosed with the hepatitis C virus (HCV), which is a known risk factor for periprosthetic joint infections. Given the poor outcomes associated with TJA infection, we recommend that candidates with HCV receive treatment prior to elective TJA. »: Interferon and ribavi...

Purpose of Review Proximal femur fractures are common traumatic injuries treated by orthopedic surgeons. Preparation and positioning for surgical intervention are critical in the proper management of proximal femur fractures. The purpose of this study was to review the current evidence on the various positioning options for patients and to highligh...

Background: The direct anterior approach (DAA) for primary total hip arthroplasty (THA) has recently increased in popularity. Recent evidence has raised concerns about whether use of the DAA is associated with increased rates of superficial and deep infection. The aim of this study was to systematically assess the literature and comparatively eval...

Background Same-day discharge (SDD) total joint arthroplasty (TJA) is increasingly popular, yet there remain concerns regarding patient safety, complication rates, and unforeseen overnight admission (failure to launch; FTL). The aim of this study is to retrospectively examine the outcomes of a large consecutive SDD-TJA series in the community hospi...

This study investigated handouts regarding common upper extremity problems for inaccuracies, distracting information, and concepts that reinforce common unhelpful cognitive biases. We reviewed handouts on upper extremity conditions from 2 electronic medical records and 2 professional associations. We categorized information as inaccurate, distracti...

Category Midfoot/Forefoot Introduction/Purpose Lateral column lengthening (LCL) is a surgical procedure used to manage forefoot abduction occurring in patients with stage IIB Adult Acquired Flat Foot Deformity (AAFD). This procedure utilizes an opening wedge osteotomy of the calcaneus which is then filled with autograft, allograft, or a titanium w...

Developmental dysplasia of the hip (DDH) encompasses a wide spectrum of hip disorders, including neonatal instability, acetabular dysplasia, hip subluxation, and frank dislocation of the hip. It is a common disorder, with a reported incidence of between 0.1% and >10% of live births. Coordinated, interdisciplinary care is important to achieving succ...

Oxidized zirconium (OxZr) femoral heads were developed to emulate the superior wear and scratch properties of ceramics while eliminating their unwanted tendency for brittle fracturing. Studies using OxZr have demonstrated reduced linear and volumetric wear of polyethylene (PE) liners when compared with cobalt chrome, ceramic, and steel femoral head...

Update This article was updated on December 22, 2020, because of a previous error. On page 3, in Figure 2, the implant that was labeled “Polarcup™ Smith & Nephew” now reads “OR30 Dual Mobility System™ Smith & Nephew.” An erratum has been published: JBJS Reviews. 2020 Dec;8(12):e20.00028ER. » Dislocation after total hip arthroplasty (THA) is the lea...

Purpose of review: The use of cannabinoids has increased since legalization of recreational and medical use in the USA. It is likely that many orthopaedic patients consume cannabinoid products during the traumatic or perioperative period. The purpose of this study was to investigate the pre-clinical data evaluating the mechanism of action of canna...

Background: The induced membrane technique was originally described as a technique for the reconstruction of long bone defects. The authors performed a systematic review to determine whether the use of the induced membrane technique is effective in large bony defects in the upper extremity. Methods: A qualitative systematic review was conducted usi...

» A multidisciplinary approach to the management of pelvic ring injuries has been shown to decrease mortality rates. » The primary goals within the emergency room are to assess, resuscitate, and stabilize the patient. The Advanced Trauma Life Support protocol guides the initial assessment of the patient. A pelvic binder or sheet should be applied t...

Perioperative management of orthopaedic patients with a hematologic disorder is a complex endeavor that requires a multidisciplinary team-based approach. A team composed of an experienced orthopaedic surgeon, an anesthesiologist, and a hematologist is necessary to achieve optimal outcomes. Patients with hemophilia and other complex hematologic diso...

Background: The decision between radial head arthroplasty and open reduction internal fixation in the context of a terrible triad elbow fracture-dislocation is debated. This study investigated both surgeon and patient factors associated with surgeons’ recommendations to use arthroplasty. Methods: One hundred fifty-two surgeon members of the Science...

Introduction: An understanding of patient characteristics associated with persistent chronic opioid use after total joint arthroplasty (TJA) will allow surgeons to better manage these patients. Our study aims to identify risk factors among preoperative chronic opioid users who continue to chronically use narcotics after total hip arthroplasty (THA...

Background: The economic effects of the COVID-19 crisis are not like anything the U.S. health care system has ever experienced. Methods: As we begin to emerge from the peak of the COVID-19 pandemic, we need to plan the sustainable resumption of elective procedures. We must first ensure the safety of our patients and surgical staff. It must be a...

Purpose: Frostbite is a cold injury that results in soft tissue loss and can lead to amputation. Vascular thrombosis following injury causes ischemic tissue damage. Despite understanding the pathology, its treatment has remained largely unchanged for over 30 years. Threatened extremities may be salvaged with thrombolytics to restore perfusion. The...

Introduction Frostbite is a freezing cold weather injury that results in soft tissue loss and can lead to amputation in severe cases. Vascular thrombosis following injury causes ischemic tissue damage. Threatened extremities may be salvaged with thrombolytics to restore perfusion. The authors performed a systematic review to determine if thrombolyt...

Background: The Single Assessment Numeric Evaluation (SANE) is a simple, one-question patient-reported outcome measure (PROM). We systematically reviewed correlations between SANE and more extensive PROMs. Methods: We identified studies with correlation coefficients between SANE and other shoulder, knee, and ankle-specific PROMs. We calculated mea...

Background: Given the strong influence of thoughts, emotions, and behaviors on musculoskeletal symptoms and limitations it's important that both scientific and lay writing use the most positive, hopeful, and adaptive words and concepts consistent with medical evidence. The use of words that might reinforce misconceptions about preference-sensitive...

Background: Variation in pain intensity and magnitude of disability among patients with musculoskeletal illness is largely accounted for by variations in symptoms of depression, catastrophic thinking, and heightened illness concern. It is possible that patients with greater stress, distress, and less effective coping strategies might be more likely...

Background: Patients and surgeons can feel uncomfortable discussing coping strategies, psychological distress, and stressful circumstances. It has been suggested that patient-reported outcome measures (PROMs) facilitate the discussion of factors associated with increased symptoms and disability. This study assessed the effect of providing feedback...