Efficacy of Methylphenidate for Internet Gaming Disorder and Internet Addiction in Patients with Attention-Deficit/Hyperactivity Disorder.

BACKGROUND: Internet Gaming Disorder (IGD) and Internet Addiction (IA) are related clinical conditions often comorbid with Attention-Deficit/Hyperactivity Disorder (ADHD). OBJECTIVE: We evaluated the efficacy of MPH for IGD/IA symptoms in ADHD patients. METHODS: We enrolled 38 drug-naive patients diagnosed with ADHD (Attention-Deficit/Hyperactivity Disorder) and IGD/IA. At baseline, all patients underwent a clinical assessment for IGD/IA symptoms and then received the most appropriate therapy according to their clinical profile. Twenty-one patients received MPH (methylphenidate) treatment, and 17 patients did not. Patients were re-evaluated after three months of treatment. RESULTS: Findings revealed significant reductions in IGD/IA symptoms over time, while no significant effect of MPH on symptom reduction was found. Clinical predictors of symptom reduction were identified, including IQ (Intelligence Quotient) and comorbid anxiety. CONCLUSION: This longitudinal prospective study contributes to the understanding of IGD/IA treatment in ADHD patients and highlights the importance of considering individual clinical characteristics when predicting treatment response. However, MPH may not directly impact IGD/IA symptom reduction.

Mapping obesity and diabetes' representation on Twitter: the case of Italy.

One of the main functions of public health is to monitor population health to identify health problems and priorities. Social media is increasingly being used to promote it. This study aims to investigate the field of diabetes and obesity and related tweets in the context of health and disease. The database extracted using academic APIs (Application Programming Interfaces) allowed the study to be run with content analysis and sentiment analysis techniques. These two analysis techniques are some of the tools of choice for the intended objectives. Content analysis facilitated the representation of a concept and a connection between two or more concepts, such as diabetes and obesity, on a purely text-based social platform such as Twitter. Sentiment analysis therefore allowed us to explore the emotional aspect related to the collected data related to the representation of such concepts. The results show a variety of representations connected to the two concepts and their correlations. From them it was possible to produce some clusters of elementary contexts and structure narrative and representational dimensions of the investigated concepts. The use of sentiment analysis and content analysis and cluster output to represent complex contexts such as diabetes and obesity for a social media community could increase knowledge of how virtual platforms impact fragile categories, facilitating concrete spillovers into public health strategies.

Drawing a pandemic vulnerabilities' map: The SoNAR-global Vulnerabilities Assessment digital and its output.

This paper describes the process, advantages and limitations of a qualitative methodology for defining and analyzing vulnerabilities during the COVID-19 pandemic. Implemented in Italy in two sites (Rome and outside Rome, in some small-medium sized municipalities in Latium) in 2021, this investigation employed a mixed digital research tool that was also used simultaneously in four other European countries. Its digital nature encompasses both processes of data collection. Among the most salient is that the pandemic catalyzed new vulnerabilities in addition to exacerbating old ones, particularly economic. Many of the vulnerabilities detected, in fact, are linked to previous situations, such as the uncertainties of labor markets, having in COVID-19 to the greatest negative effects on the most precarious workers (non-regular, part-time, and seasonal). The consequences of the pandemic are also reflected in other forms of vulnerability that appear less obvious, having exacerbated social isolation, not only out of fear of contagion, but because of the psychological challenges posed by containment measures themselves. These measures created not mere discomfort, but behavioral changes characterized by anxiety, fearfulness, and disorientation. More generally, this investigation reveals the strong influence of social determinants throughout the COVID-19 pandemic, creating new forms of vulnerability, as the effects of social, economic, and biological risk factors were compounded, in particular, among already marginalized populations.

How COVID-19 Phases Have Impacted Psychiatric Risk: A Retrospective Study in an Emergency Care Unit for Adolescents.

Dramatic events during the COVID-19 pandemic have acutely impacted the psychosocial environment worldwide, with negative implications for mental health, particularly for more vulnerable children and adolescents with severe psychiatric illnesses. Some data suggest that the pandemic waves may have produced different psychopathological consequences, further worsening in the second phase of the pandemic, compared to those in the first lockdown, soon after March 2020. To test the hypothesis of a further worsening of psychiatric consequences of COVID-19 in the second lockdown compared to the first lockdown, we focused our analysis on a consecutive sample of youth referred to a psychiatric emergency unit for acute mental disorders in the time period between March 2019-March 2021. The sample, consisting of 241 subjects (123 males and 118 females, ranging in age from 11 to 17 years), was divided into three groups: Pre-Lockdown Group (PLG, 115 patients); First Lockdown Group (FLG, 65 patients); and Second Lockdown Group (SLG, 61 patients). Patients in the SLG presented more frequently with non-suicidal self-injuries (NSSIs), suicidal ideation, and suicidal behavior, while no significant differences in self-harm were found between PLG and FLG. Eating disorders were more frequent in both the FLG and SLG, compared to the PLG, while sleep problems were higher only in the SLG. Furthermore, patients in the SLG presented with more frequent psychological maltreatments and neglect, as well as with psychiatric disorders in the parents. Adverse traumatic experiences and internalizing disorders were significantly associated with an increased risk of suicidality. Intellectual disability was less represented from the PLG to SLG, and similarly, the rate of ADHD was lower in the SLG. No differences were found for the other psychiatric diagnoses. This information may be helpful for a better understanding and management of adolescents with severe emotional and behavioral disorders after the exposure to long-lasting collective traumas.

Territorial spillover of COVID-19 infections in Rome during the "second wave".

The study investigates the spread of the effects of COVID in 2019 in the city of Rome, focusing on the socio-economic factors that affect the incidence of the virus in the 155 urban areas (UAs) of the city. The units of analysis of this study are the UAs. The survey emphasizes the weight of spatial contiguity between the 155 UAs. For this purpose, the spatial data model analyses the spillover between contiguous units of analysis, distinguishing direct and indirect spatial effects. Digital geocoding of the collected data has been performed to create a geodatabase (GDB) that allows the statistical information to be turned into geographic layers. Geographic layers represent information layers that can be overlapped with each other on the map of Rome. The database allowed the variables to be handled with spatial analysis methods. This emphasizes the usefulness of digital analysis methods for the study of such a complex and rapidly changing phenomenon as the spread of SARS-CoV-19 infection on an urban scale.

Internet Gaming Disorder in Children and Adolescents with Attention Deficit Hyperactivity Disorder.

Although Attention Deficit Hyperactivity Disorder (ADHD) has been related to an increased risk for behavioral addictions, the relationship between ADHD and Internet Gaming Disorder (IGD) is still debated. The aim of this study is to address this topic by exploring the prevalence of IGD in a consecutive sample of ADHD youth, compared to a normal control group, and by assessing selected psychopathological and cognitive features in ADHD patients with and without IGD. One hundred and eight patients with ADHD (mean age 11.7 ± 2.6 years, 96 males) and 147 normal controls (NC) (mean age 13.9 ± 3.0 years, 114 males) were included in the study and received structured measures for IGD. In the ADHD group, 44% of the sample were above the IGD cut-off, compared to 9.5% in the NC group. ADHD patients with IGD presented with greater severity and impairment, more severe ADHD symptomatology, more internalizing symptoms, particularly withdrawal/depression and socialization problems, and more prominence of addiction and evasion dimensions. A binary logistic regression showed that the degree of inattention presented a greater weight in determining IGD. These findings may be helpful for identifying, among ADHD patients, those at higher risk for developing a superimposed IGD.

Acute Tolerability of Methylphenidate in Treatment-Naïve Children with ADHD: An Analysis of Naturalistically Collected Data from Clinical Practice.

OBJECTIVES: The acute tolerability of methylphenidate (MPH) in children with attention-deficit/hyperactivity disorder (ADHD) has been studied mainly in research samples. Taking advantage of the mandatory test-dose procedure required for starting MPH in Italy, this study aimed to assess the incidence of intolerable adverse events after initial exposure to MPH in routine clinical practice. METHODS: The medical records of 480 consecutively treated, previously drug-naïve children and adolescents with ADHD (90% male, mean age 10.6 ± 3.0 years) were retrospectively analyzed. All children received an initial single dose of MPH immediate release (5 or 10 mg) followed by a 4-hour direct medical observation. Heart rate and blood pressure were measured at dosing and 1, 2, and 3 hours afterwards. If the first dose was well tolerated, the child continued treatment with MPH 5-20 mg daily, and was reassessed a week later. RESULTS: Eleven patients (2.3%, 95% CI 1.1-4.1) interrupted treatment within a week of initiation because of the following adverse events: irritability (n = 3), tics worsening (n = 3), reduced appetite (n = 1), enuresis (n = 1), hallucinations (n = 1), hyperfocus (n = 1), and 'rebound' behavioral worsening (n = 1). The most common adverse events were reduced appetite (20%), irritability (14.2%), headache (10.6%), sleep problems (9.4%), stomachache (9.4%), and tics (5%). Intellectual disability increased the risk of any adverse event in general and of irritability in particular. No cardiovascular symptom was clinically reported. However, routine assessments of vital signs during the first 3 hours after the first dose of MPH showed that 9% of the children had a 20% increase in heart rate, 8.8% had a 20% increase in diastolic blood pressure and 4.5% had a 20% increase in systolic blood pressure. Of these, 25.2% still had an elevated heart rate 1 week later. CONCLUSIONS: Among stimulant-naïve children in clinical practice, the incidence of acute MPH intolerance can be estimated to be between 1.2 and 4.1%. An asymptomatic elevation in cardiovascular parameters can be observed in about 1 out of 10 children and warrants monitoring during ongoing treatment.

A Comparison between Severe Suicidality and Nonsuicidal Self-Injury Behaviors in Bipolar Adolescents Referred to a Psychiatric Emergency Unit.

BACKGROUND: Severe suicide ideation or attempts and non-suicidal self-injury (NSSI) present both differences and relevant overlaps, including frequent co-occurrence and shared risk factors. Specific categorical diagnoses, namely bipolar disorder (BD), may affect clinical features and natural histories of suicidal or not suicidal self-harm behaviour. Our study aimed to compare suicidality (severe suicidal ideation or suicidal attempts) and NSSI in referred bipolar adolescents. METHODS: The sample included 95 bipolar adolescents (32 males, 63 females) aged 11 to 18 years. Thirty adolescents with suicide attempts/suicidal ideation and BD (SASIB) were compared with structured measures to 35 adolescents with NSSI and BD, without suicidal ideation or attempts (NSSIB), and to 30 adolescents with BD, without suicidal ideation or attempts or NSSI (CB). RESULTS: Compared to CB, suicidality and NSSI were both associated with female sex, borderline personality disorder and self-reported internalizing disorders, anxiety/depression and thought disorders. The NSSI were specifically associated with somatic problems. Severe suicidal ideation and suicide attempts were associated with adverse life events, immigration, bullying, eating disorders, social problems, depressive feelings, performance and social anxiety, and feelings of rejection. CONCLUSIONS: Both shared and differential features between suicidal and not suicidal adolescents may represent possible targets for diagnostic and preventative interventions.

Suicidal Ideation and Suicidal Attempts in Referred Adolescents with High Functioning Autism Spectrum Disorder and Comorbid Bipolar Disorder: A Pilot Study.

Suicidal ideation and attempts in adolescents are closely associated to bipolar disorders (BD). Growing evidence also suggests that high functioning autism spectrum disorders (HF-ASD) are at increased risk for suicidal ideation and behaviors. Although BD and HF-ASD are frequently comorbid, no studies explored suicidality in these individuals. This exploratory study addressed this issue in a clinical group of inpatient adolescents referred to a psychiatric emergency unit. Seventeen adolescents with BD and HF-ASD and severe suicidal ideation or attempts (BD-ASD-S), were compared to 17 adolescents with BD and HF-ASD without suicidal ideation or attempts (BD-ASD-noS), and to 18 adolescents with BD and suicidal ideation or attempts without ASD (BD-noASD-S), using a structured assessment methodology. Individuals with BD-ASD-S had a higher intelligence quotient, more severe clinical impairment, more lethality in suicide attempts, more internalizing symptoms, less impulsiveness, and lower social competence. Severity of ASD traits in individuals and parents did not correlate with suicidal risk. Some dimensions of resilience were protective in terms of repulsion by life and attraction to death. Main limitations are the small sample size, the lack of a control group of typically developing adolescents. However, a better understanding of the specificities of bipolar HF-ASD individuals with suicidality may improve prevention and treatment strategies.

A Naturalistic Study of Youth Referred to a Tertiary Care Facility for Acute Hypomanic or Manic Episode.

BACKGROUND: Bipolar Disorders (BD) in youth are a heterogeneous condition with different phenomenology, patterns of comorbidity and outcomes. Our aim was to explore the effects of gender; age at onset (prepubertal- vs. adolescent-onset) of BD; and elements associated with attention deficit hyperactivity disorder (ADHD) and Substance Use Disorder (SUD) comorbidities, severe suicidal ideation or attempts, and poorer response to pharmacological treatments. METHOD: 117 youth (69 males and 57 females, age range 7 to 18 years, mean age 14.5 ± 2.6 years) consecutively referred for (hypo)manic episodes according to the Diagnostic and Statistical Manual of Mental Disorders, 54th ed (DSM 5) were included. RESULTS: Gender differences were not evident for any of the selected features. Prepubertal-onset BD was associated with higher rates of ADHD and externalizing disorders. SUD was higher in adolescent-onset BD and was associated with externalizing comorbidities and lower response to treatments. None of the selected measures differentiated patients with or without suicidality. At a 6-month follow up, 51.3% of the patients were responders to treatments, without difference between those receiving and not receiving a psychotherapy. Clinical severity at baseline and comorbidity with Conduct Disorder (CD) and SUD were associated with poorer response. Logistic regression indicated that baseline severity and number of externalizing disorders were associated with a poorer outcome. CONCLUSIONS: Disentangling broader clinical conditions in more specific phenotypes can help timely and focused preventative and therapeutic interventions.

Psychopathological features in referred adolescents with psychogenic nonepileptic seizures with or without epilepsy.

Psychogenic nonepileptic seizures (PNES) are episodic manifestations that mimic epileptic seizures (ES) although not associated with electroencephalogram (EEG) abnormalities. Psychogenic nonepileptic seizures and ES, however, can often cooccur. Emotional distress in adolescents can trigger PNES, but the psychopathological and personality features are still unknown. The aim of this study was to explore psychopathological features in a sample of referred youth with PNES, with or without ES, compared with a control group with ES. Thirty-four patients aged 12 to 21 years, 19 females and 15 males, were included in the study, 15 patients with PNES, 7 with PNES and ES, and 12 with ES. The three groups were compared according to psychiatric categorical diagnoses, psychopathological dimensions, life stressors, and personality traits, including alexithymia, interpersonal reactivity, and resilience, all assessed with structured measures. Patients with PNES, with or without ES, were more severely impaired, had a higher incidence of mood disorders, more frequent lifetime traumatic experiences, and lower resilience. All the three groups presented alexythimic traits and emotional dysregulation. Major limitations are the small sample size and the lack of a control group of healthy subjects. Disentagling psychopathological characteristics in PNES can help clinicians to focus diagnostic approaches and therapeutic interventions.

Suicidal ideation, suicidal attempts and non-suicidal self-injuries in referred adolescent s.

BACKGROUND: Specific risk factors may affect persistent suicidal ideation (SI) and suicide attempts (SA) in adolescence. Non-suicidal self-injuries (NSSIs) are possible antecedent or associated factors of suicidality. AIMS: To compare clinical features in adolescents with mood disorders referred for severe SI and for SA, and to explore differences in those with or without NSSIs. METHOD: 22 youth with severe SI (16 males [77.3%], mean age 14.86±1.86 years), and 19 with SA (16 males [84.2%], mean age 15.05±1.75 years) were assessed for familial psychiatric disorders/suicidal attempts, traumatic antecedents, diagnosis, impulsivity, hopelessness, attitude for life and death, resilience, and according to additional NSSIs. RESULTS: Patients with SI presented more frequent anxiety disorders, those with SA more severe suicidal ideation with plan and intention, and more duration of suicidal ideation. Resilience was lower in SI, while all the other features did not distinguish the two groups. NSSIs were found in 70.7% of the sample, without differences between groups; only impulsivity was more frequent in NSSI group. DISCUSSION: These specific features were frequently found in this high-risk sample, but only comorbid anxiety disorders, and more active, persistent and planned suicidal ideation differentiated the two groups. CONCLUSIONS: Patients with severe SI and SA may represent different variants of the same clinical entity. Given the high frequency of the explored features in the whole suicidal sample, this diagnostic methodology may be helpful and informative in all the high-risk adolescents with mood disorders, namely with NSSI.

A NATURALISTIC EXPLORATORY STUDY OF OBSESSIVE-COMPULSIVE BIPOLAR COMORBIDITY IN YOUTH.

BACKGROUND: Growing evidence supports the comorbidity between bipolar disorder (BD) and obsessive-compulsive disorder (OCD) in children and adolescents. Our aim is to further explore clinical and treatment implications of this comorbidity, as it appears in clinical practice. METHOD: The sample included 429 consecutive patients with BD and/or OCD as primary diagnoses, followed for a mean period of 6 months (range 4-9 months), 172 with BD (102 males, mean age 13.7±2.9 years), 169 with OCD (118 males, mean age of 13.2±2.7 years) and 88 with comorbid BD+OCD (56 males, mean age 14.2±2.6 years, 52 with BD as the primary diagnosis), followed for a mean period of 6 months (range 4-9 months). The comorbid group was compared to pure BD and OCD groups, to explore differential clinical and treatment features. RESULTS: The BD-OCD comorbidity was found in 33.8% of the BD patients and in 34.2% of the OCD patients. Age at onset of BD and OCD were not different in pure and "comorbid" groups. The comorbid group presented a higher occurrence of BD type II and hoarding symptoms, and more frequently received a psychotherapy and second generation antipsychotics, but it presented the poorest outcome in terms of response to treatments. Severity at baseline (clinical severity and functional impairment), hoarding obsessions and compulsions, and conduct disorder comorbidity were associated with a treatment non-response. LIMITATIONS: A selection bias may have increased the rate of comorbidity, as most of the patients were referred to our tertiary hospital for severe BD and/or OCD and pharmacological treatment. We have used CGI-I as an outcome measure, not a specific measure of BD or OCD symptoms' severity and improvement. The short duration of the follow-up may limit our conclusions. CONCLUSIONS: The timely identification of BD-OCD comorbidity may have relevant clinical implications in terms of symptomatology, course, treatment and outcome.

Pharmacotherapy of emotional dysregulation in adults with ADHD: A systematic review and meta-analysis.

Emotional dysregulation (ED) is a dysfunction in modifying an emotional state in an adaptive and goal oriented way, with excitability, ease anger, and mood lability. It is present in up to 70% of adults with ADHD, regardless of other comorbidities, and substantially worsens the psychosocial outcomes of the disorder. Besides fronto-parietal circuits mediating top-down control, brain regions involved in bottom-up processes (e.g., amygdala, orbitofrontal cortex, and ventral striatum) are implicated in ED. We performed a systematic review/meta-analysis of double-blind randomized controlled trials of ADHD medications to assess their effects on ED in adults with ADHD. We searched an extensive set of databases, international trials registries, and contacted study authors/drug companies for unpublished data. We retained 21 trials. We found small-to-moderate effects (methylphenidate: SMD=0.34, 95% CI=0.23-0.45; atomoxetine: SMD=0.24, 95% CI=0.15-0.34; lisdexamfetamine: SMD=0.50, 95% CI=0.21-0.8). We suggest that, whilst ADHD medications are effective on ADHD core symptoms, they may be less effective on bottom-up mechanisms underlying ED. Further research on novel pharmacological and non-pharmacological strategies for ED in adults with ADHD is warranted. PROSPERO: CRD42017068426.

Emotional reactivity in referred youth with disruptive behavior disorders: the role of the callous-unemotional traits.

Deficits in emotional reactivity are frequently reported in Disruptive Behavior Disorders (DBDs). A deficit in prosocial emotions, namely the callous unemotional traits (CU), may be a mediator of emotional reactivity. Our aim is to investigate subjective emotional reactivity towards visual stimuli with different affective valence in youths with DBDs and healthy controls. The clinical sample included 62 youths with DBDs (51 males, 8 to 16 years, mean 11.3±2.1 years), the control group 53 subjects (36 males, 8 to 16 years, mean 10.8±1.5 years). The groups were compared using the Child Behavior Checklist (CBCL), the Inventory of Callous-Unemotional Traits (ICU), and the International Affective Picture System (IAPS), which explores the affective (pleasant/unpleasant emotional reaction) and arousal (low/high intensity of emotion) dimensions. The DBD group presented higher scores in externalizing and internalizing CBCL scores, and in ICU callous and indifferent subscales. At the IAPS, DBD patients differed from controls in the affective valence of the images, rating less unpleasant neutral and negative images. The CU traits were the only predictor of emotional reactivity in the DBD sample. A less aversive way to interpret neutral and negative stimuli may explain why DBD patients are less responsive to negative reinforcements.

Efficacy of a multimodal treatment for disruptive behavior disorders in children and adolescents: focus on internalizing problems.

Disruptive Behavior Disorders (DBDs) are among the most common reasons for youth referrals to mental health clinics. Aim of this study is to compare short and medium term efficacy of a multimodal treatment program (MTP), compared to community care (treatment-as-usual, TAU). The sample included 135 youths with DBDs (113 males, age range 9-15 years, mean age 12±2.5 years) were assigned either to a MTP (n=64), or addressed to community care for a TAU (n=71). Outcome measures were the Child Behaviour Checklist (CBCL) and the Children's Global Assessment Scale (C-GAS). All subjects were assessed at the baseline (T0), after 1-year treatment (T1) and after a 2-year follow-up (T2). Compared with patients receiving TAU, youths in the MTP showed, both at T1 and T2, significantly lower scores on CBCL Externalizing Scale, Internalizing Scale, Anxious/Depressed, Social Problems, and Aggressive Behavior, and higher scores at the C-GAS. Improvement in Internalizing Scales was particularly evident, with a shift from the clinical to the non-clinical range. Rate of use of mental health services and scholastic failure were reduced in the MTP. It is suggested that the improvement of the Internalizing symptoms is a crucial component of the therapeutic process in this MTP.

Response to treatments in youth with disruptive behavior disorders.

OBJECTIVE: Predictors of poor response to treatments in youths with disruptive behavior disorders (DBDs), including conduct disorder (CD) and oppositional defiant disorder (ODD), are under-studied. Multimodal psychosocial interventions are the best option, but a significant portion of patients needs adjunctive pharmacotherapy. The concept of "psychopathy", and namely, the callous (lack of empathy and guilt) and unemotional (shallow emotions) trait, has been considered a possible specifier indicating a more severe subgroup of patients. We explored whether the callous-unemotional trait (CU) may affect the response to multimodal treatment in referred youths with DBDs. METHOD: 118 youths (102 males, age range 6-14years, mean age 11.1±2.5years) completed a 12-month multimodal intervention, 48 of whom (41%) needed an associated pharmacotherapy. The patients were assessed according to psychopathological profile (Child Behavior Checklist, CBCL), severity and improvement (Clinical Global Impression-Severity and Improvement scores, CGI-S and CGI-I), functional impairment (Children-Global Assessment Scale, C-GAS), and psychopathic dimension (Antisocial Process Screening Device, APSD), including CU dimension. RESULTS: 58 patients (49.2%) were non-responders. They had more frequently a diagnosis of CD than ODD, presented a comorbid mood disorder, higher CBCL scores in rule-breaking behavior, and higher APSD ("psychopathic") scores. Subjects with higher or lower CU differed only according to the rate of responders (35% vs. 60%, p<.05). The linear blockwise regression indicated that pre-treatment functional impairment (C-GAS) and baseline CU trait were predictors of non-response. The logistic regression indicated that only the value of baseline APSD-CU trait was a predictor of non-response. CONCLUSIONS: A careful assessment of baseline clinical functioning and psychopathological features, namely the psychopathic traits, can identify the most problematic patients, and has specific prognostic and treatment implications.

Assessment of the initial stability of the Symax femoral stem with EBRA-FCA: a multicentric study of 85 cases.

We report a study of 85 Symax femoral stems that were followed at regular intervals with radiographs at 6, 12, 24 and 36 months. The radiological migration of each stem was measured using the computer-assisted EBRA -FCA method. In 30 cases in which the EBRA method did not provide a complete measurement another computer-assisted method (Roman version 1.7) was employed. In all cases the distal migration of the stems was minimal, The threshold migration value used to define the stability of a stem was 1.5 mm at 24 months. The mean migration within the first two years was -0.17 mm (+/- 0.3) at 6 months, -0.31 mm (+/- 0.4) at 12 months and -0.45 mm (+/- 0.5) at 24 months. Only two cases exceeded the threshold limit of 1.5 mm at the two-year follow-up, but both values were lower than 2 mm. In the 25 cases which reached three-year follow-up the mean distal migration was -0.84 (+/-0.7). In four of them the subsidence exceeded 1.5 mm, but only one exceeded 2 mm. These data represent a positive predictive factor for the minimal risk of future aseptic loosening.