Here is the design of a clinical trial:

Official Title: Assistive Robotic in the Elderly: Innovative Models in the Rehabilitation of the Elderly With Hip Fractures Through Technological Innovation

Included conditions:
- Hip Fractures
- Frail Elderly
- Robotic Rehabilitation

Study Armgroups:
- {'label': 'control group', 'type': 'ACTIVE_COMPARATOR', 'description': 'Ten traditional physical treatment sessions divided into 2 training sessions per week for 5 weeks', 'interventionNames': ['Other: traditional rehabilitation']}
- {'label': 'virtual reality games arm', 'type': 'EXPERIMENTAL', 'description': 'Ten technological treatment sessions divided into 2 training sessions per week for 5 weeks.', 'interventionNames': ['Other: virtual reality games intervention']}
- {'label': 'robotic treadmill arm', 'type': 'EXPERIMENTAL', 'description': 'Ten traditional physical treatment sessions divided into 2 training sessions per week for 5 weeks.', 'interventionNames': ['Other: robotic treadmill intervention']}

Interventions:
- {'type': 'OTHER', 'name': 'traditional rehabilitation', 'description': 'Each session will include 50 minutes of traditional physical rehabilitation therapy', 'armGroupLabels': ['control group']}
- {'type': 'OTHER', 'name': 'virtual reality games intervention', 'description': 'Each session will include 30 minutes of traditional physical rehabilitation therapy followed by 20 minutes of robotic training by Tymo system (Tyromotion, Austria), a wireless platform for the balance and the postural control training that simulates floor walking and stairs climbing. Tymo system is connected to a screen and provides virtual reality games, adaptable to the functional capacity of the patient. Through the games proposed, the physiotherapist will decide to work in a dimension (antero-posterior or medio-lateral dimension) or in two dimensions (combining the antero-posterior and medio-lateral movements).', 'armGroupLabels': ['virtual reality games arm']}
- {'type': 'OTHER', 'name': 'robotic treadmill intervention', 'description': 'Each session will include 30 minutes of traditional physical rehabilitation therapy followed by 20 minutes of robotic training by Walker view (TecnoBody, Italy), a treadmill equipped with a sensorized belt with eight load cells and a 3D camera.to detect length, speed and symmetry of the pace and load, range of the trunk, hips and knees. Patients will be asked to walk at a comfortable speed, while the physiotherapist will be able to work on different parameters such as step length, load distribution, and step height. The setting will take place taking into account the clinical conditions of each patient, customizing the intervention. The Walker View will offer visual and auditory feedback to the patient, so as to correct gait in real time.', 'armGroupLabels': ['robotic treadmill arm']}

Primary Outcomes:
- {'measure': 'difference in falling risk among virtual reality games arm, robotic treadmill arm and control arm', 'description': 'falling risk will be evaluated by the Tinetti performance oriented mobility assessment (POMA). POMA test has two subscales, Balance and Gait sections. Total score is obtained by adding the scores of the two subscales (balance + gait) . Total score \\< 19 high fall risk, total score 19-24 medium fall risk, total score 25-28 low fall risk', 'timeFrame': 'before treatment, and 5 weeks, 6 months, 12 months and 24 months after intervention commencement'}

Please estimate the sample size based on the assumption: 
Statistical power of 80%, significance level of 0.05, three groups, five repeated assessments, and a 25% drop-out rate.
Sample size
        The POMA,18 a test widely used to assess walking ability and associated with equilibrium, was used to calculate the sample size.19 Assuming a small effect size of 10%,20 it is estimated that the overall sample size needed to capture this effect size is of 153 subjects, assuming a statistical power of 80%, a significance level of 0.05, three groups and five repeated assessments (a baseline and four follow-ups) in an analysis of variance (ANOVA) model withinâbetween interactions. Even assuming a 25% drop-out rate, the total number required would be 195 subjects (65 for each arm).
        It is hypothesised that this sample dimension is more than sufficient to grasp a variation also for secondary outcomes for which a treatment effect size is assumed of a similar or higher magnitude than that identified for the primary outcome.17 21