Does dual-mobility cup geometry affect posterior horizontal dislocation distance?

BACKGROUND: Dual-mobility acetabular cups have been marketed with the purported advantages of reduced dislocation rates and improvements in ROM; however, the relative efficacies of these designs in terms of changing joint stability via ROM and dislocation distance have not been thoroughly evaluated. QUESTIONS/PURPOSES: In custom computer simulation studies, we addressed the following questions: (1) Do variations in component geometry across dual-mobility designs (anatomic, modular, and subhemispheric) affect the posterior horizontal dislocation distances? (2) How do these compare with the measurements obtained with standard hemispheric fixed bearings? (3) What is the effect of head size on posterior horizontal dislocation distances for dual-mobility and standard hemispheric fixed bearings? (4) What are the comparative differences in prosthetic impingement-free ROM between three modern dual-mobility components (anatomic, modular, and subhemispheric), and standard hemispheric fixed bearings? METHODS: CT scans of an adult pelvis were imported into computer-aided design software to generate a dynamic three-dimensional model of the pelvis. Using this software, computer-aided design models of three dual-mobility designs (anatomic, modular, and subhemispheric) and standard hemispheric fixed bearings were implanted in the pelvic model and the posterior horizontal dislocation distances measured. Hip ROM simulator software was used to compare the prosthetic impingement-free ROMs of dual-mobility bearings with standard hemispheric fixed-bearing designs. RESULTS: Variations in component design had greater effect on posterior horizontal dislocation distance values than increases in head size in a specific design (p < 0.001). Anatomic and modular dual-mobility designs were found to have greater posterior horizontal dislocation distances than the subhemispheric dual-mobility and standard hemispheric fixed-bearing designs (p < 0.001). Increasing head sizes increased posterior horizontal dislocation distances across all designs (p < 0.001). The subhemispheric dual-mobility implant was found to have the greatest prosthetic impingement-free ROM among all prosthetic designs (p < 0.001; R(2) = 0.86). CONCLUSIONS: The posterior horizontal dislocation distances differ with the individual component geometries of dual-mobility designs, with the anatomic and modular designs showing higher posterior horizontal dislocation distances compared with subhemispheric dual-mobility and standard hemispheric fixed-bearing designs. CLINICAL RELEVANCE: Static, three-dimensional computerized simulation studies suggest differences that may influence the risk of dislocation among components with varying geometries, favoring anatomic and modular dual-mobility designs. Clinical studies are needed to confirm these observations.

What factors affect posterior dislocation distance in THA?

BACKGROUND: Dislocation remains common after total hip arthroplasty. Efforts have been made to identify and minimize risk factors. One such factor, jump distance, or the distance the femoral head must travel before dislocating, has been poorly characterized with respect to three-dimensional kinematics. QUESTIONS/PURPOSES: We therefore determined: (1) the three-dimensional stability of four different component designs; (2) whether the degree of abduction and anteversion affects the stability; (3) whether pelvic inclination angles affected stability; and (4) which combination of these three factors had the greatest stability. METHODS: We created a positionable three-dimensional model of a THA. Acetabular components were modeled in various abduction and anteversion angles and in two different pelvic inclinations which simulate standing and chair-rising activities. RESULTS: The posterior horizontal dislocation distance increased as inclination angle and femoral head size increased. The 48-mm resurfacing typically had lower jump distances and was at risk of posterior edge loading at 30° inclination. The highest jump distance for all positions and activities occurred with the dual-mobility bearing. CONCLUSION: These findings suggest that monoblock cups require extremely accurate positioning for low dislocation risk and that pelvic orientation may increase dislocation risks. CLINICAL RELEVANCE: As a result of the dual-mobility designs having the greatest resistance to dislocation, these cups may be appropriate for patients who are at risk for dislocation in difficult primary situations and in revision hip arthroplasty procedures in which proper component orientation may be less likely to be achieved.

Patterns of injury and childhood psychiatric disorder in a low-income population.

This study examined cross-sectional patterns of association between childhood psychiatric disorders and non-fatal injuries. The study population consisted of 763,251 youth between the ages of five and 18 years. Having any psychiatric diagnosis increased the odds of injury by a factor of two (OR = 2.12, CI 2.08-2.16). Strong associations were found between poisoning and unipolar depression (OR = 5.45, 95% CI 5.02-5.93), bipolar mood disorders (OR = 7.00, 95% CI 6.15-7.95) and major depression (OR = 9.63; 95% CI 8.51-10.89). Medicaid data provide an important resource to examine the intersection of psychiatric diagnosis and injury on a population basis.

The kids oneida project: what happened to services when the payment rules changed.

Community-based systems of care may provide high quality, cost-effective alternatives to institutional care for children and adolescents. This report examines Kids Oneida (KO), a not-for-profit managed care entity established in upstate New York in 1998 to serve such children and their families. Changes in payment rules that established the program allowed KO to contract with a wide array of providers to provide and be reimbursed for non-traditional and formerly unreimbursable services, such as mentoring and supervision. By design, emphasis was on highly individualized plans of care in which traditional office-based services played only a small part. During the first 30 months of KO's operation, 228 children, whose severity of emotional disturbances was comparable to those of children placed in residential treatment centers, had average monthly expenditures for first admissions of 2,734 dollars for services and 228 dollars for administrative fees. Median length of stay in the program was 13.5 months, yielding an estimate of 39,987 dollars for typical length of stay. Length of stay and treatment costs were not related to children's gender or race. Length of stay was significantly longer for children with diagnoses indicating attention deficit hyperactivity disorder and behavior disorders. Treatment costs were significantly higher for children with behavior disorders and/or substance use and children who had had prior contact with the juvenile justice system.

Children in adoptive families: overview and update.

OBJECTIVE: To summarize the past 10 years of published research concerning the 2% of American children younger than 18 years old who are adoptees. METHOD: Review recent literature on developmental influences, placement outcome, psychopathology, and treatment. RESULTS: Adoption carries developmental opportunities and risks. Many adoptees have remarkably good outcomes, but some subgroups have difficulties. Traditional infant, international, and transracial adoptions may complicate adoptees' identity formation. Those placed after infancy may have developmental delays, attachment disturbances, and posttraumatic stress disorder. Useful interventions include preventive counseling to foster attachment, postadoption supports, focused groups for parents and adoptees, and psychotherapy. CONCLUSIONS: Variables specific to adoption affect an adopted child's developmental trajectory. Externalizing, internalizing, attachment, and posttraumatic stress disorder symptoms may arise. Child and adolescent psychiatrists can assist both adoptive parents and children.

Sports medicine practice economics part 1: coding basics.

Proper understanding of coding, billing, and other practice economics issues in sports medicine is vital for practice success. Lack of accuracy and understanding in these areas may lead to problems that range from lost income to practice audits and potentially steep fines. A basic understanding of current procedural terminology (CPT), awareness of international classification of diseases (ICD-9) and healthcare common procedure coding system (HCPCS) codes, and the knowledge of how to apply them benefit sports medicine physicians.

Sports medicine practice economics part 2: consultations, modifiers, and other codes.

Physicians face numerous challenges related to sports medicine practice economics, including coding and billing for consultations. Some of this difficulty stems from a lack of widespread recognition of sports medicine as a specialty. To further complicate matters, many insurance companies refuse to recognize dual credentials in both family medicine and sports medicine. Physicians can better position themselves for appropriate reimbursement from third-party payers by becoming familiar with modifiers and related codes for various sports medicine services, including fracture care, injections and arthrocentesis, and osteopathic mobilization.

Sports medicine practice economics part 3: billing, collecting, appeals, and related tasks.

Knowledge about proper coding in sports medicine will not benefit a physician or his or her practice if bills submitted to insurance companies are not regularly monitored and analyzed for trends. Physicians can help ensure successful collections by understanding the dynamics of reimbursement, enlisting the efforts of office colleagues, and facilitating patient involvement when appropriate. This is the third article in a three-part series about economics issues encountered in a sports medicine practice. The authors are not certified coding experts, and the articles are not meant to serve as a definitive guide to billing and coding in sports medicine, but rather to provide insight into this poorly understood and complex area of medicine that can make or break a practice. The first article, on coding basics, appeared in May, and the second, on advanced sports medicine coding, appeared in June.

Regional variation and clinical indicators of antipsychotic use in residential treatment: a four-state comparison.

The last decade saw an increase in psychotropic use with pediatric populations. Antipsychotic prescriptions are used frequently in residential treatment settings, with many youth receiving antipsychotics for off-label indications. Residential treatment data from 4 states were examined to determine if regional variation exists in off-label prescription and what clinicalfactors predict use. The study used clinical and pharmacological data collected via retrospective chart reviews (N = 732). The Child and Adolescent Needs and Strengths Assessment-Mental Health Version was used to measure symptom and risk severity. Of youth receiving antipsychotics, 42.9% had no history of or current psychosis. Statistical analyses resulted in significant regional variation in use across states and yielded attention deficit/impulsivity, physical aggression, elopement, sexually abusive behavior, and criminal behavior as factors associated with antipsychotic prescription in nonpsychotic youth. Antipsychotic prescription is inconsistent across states. Off-label prescription is frequent and likelihood of use increases with behavior problems.

Psychotropic medications prescribing patterns for children and adolescents in New York's public mental health system.

CONTEXT: Breakthroughs in the development of effective medications for a number of psychiatric disorders have led to increased use of these compounds in the treatment of children. OBJECTIVES: To understand the use of psychotropic medications in the treatment of children, a state-wide study was undertaken based on the data collected in a large planning study. DATA AND SETTING: A stratified random sample of 10 different program types in New York State produced data on children served in different specialty mental health services. PARTICIPANTS: Randomly selected cases were reviewed at a randomly selected sites to generate a sample of 1592 cases on which data were collected on clinical presentation and service use, including psychotropic medication prescriptions. MAIN OUTCOME MEASURES: The Child and Adolescent Needs and Strengths (CANS-MH) tool was used to provide a reliable review of clinical indicators. RESULTS: Psychotropic medication use is common in the children's public mental health service system in New York. Most children served in high intensity settings receive medication as a part of their treatment. It appears that most prescriptions for stimulants and antidepressants are consistent with either diagnostic or symptom indications. Many children with these indications are not on medications. On the other hand, a large number of children without evidence of psychosis receive antipsychotic medications. CONCLUSION: The evidence suggests that stimulant and antidepressant are not over-prescribed. However, the use of antipsychotic medications for other indications is a priority for further research.

"Real world" atypical antipsychotic prescribing practices in public child and adolescent inpatient settings.

This article examines the factors that influence antipsychotic use among youth treated in public inpatient facilities. By combining data from 11 focus groups, a survey of 43 researchers and clinicians, and a chart review of 100 closed patient charts, we investigated the interplay between physicians' and staff members' perceptions of problems related to antipsychotic prescribing, their beliefs concerning optimal approaches, their actual recorded prescribing behaviors, and the discrepancies between their beliefs and their recorded practices. We discovered that antipsychotics are prescribed broadly to treat a variety of conditions, including nonpsychotic disorders among children in public inpatient facilities. Despite overall expert consensus regarding "best practices," physicians described systemic obstacles that prevent the application of these practices, and our data confirmed that best practices are not always followed. Future research should be done with this patient population and should investigate the factors that influence antipsychotic use among inpatient youth.