Comparing a Sensor for Movement Assessment With Traditional Clinical Assessment Methods in Patients After Knee Surgery.

Study Overview
=================
Brief Summary
-----------------
Eight parameters measurable by the sensor Orthelligent Pro are compared with traditional measurements based on a goniometer or video taping. The aim is to inform potential users about the distribution of the differences they have to expect when moving from traditional measurement methods to the new sensor. Patients will perform eight corresponding movement exercises at a single study visit.

Detailed Description
-----------------
In patients suffering from musculo-skeletal disorders, the restoration of full functioning is an important goal of many interventions. Assessment of functioning is often based on corresponding tests. If functioning is related to specific movement patterns, accelerometers and similar sensors are promising to allow a simple and objective assessment, and may replace traditional assessment methods, e.g. based on measurements with the goniometer. Corresponding products tend to enter the market and face clinicians and patients with the question, to which degree they are reliable and comparable with the traditional assessment methods. Recently, a sensor named Orthelligent Pro has been released by the medical device company OPED and is today commercially available. The sensor - to be attached to the knee of a subject - offers the opportunity to assess several parameters related to movement patterns in the lower extremities that are of relevance in the rehabilitation process of orthopedic patients. The aim of the current project is to inform potential users of this sensor about the difference they have to expect when compared to traditional assessment techniques of the same parameters and about the reproducibility of the measurements both based on the sensor and based on traditional assessments. Patients of a single clinic will be offered participation. The patients will perform the eight exercises at a single study visit arranged as an addition to a routine follow up visit.

Official Title
-----------------
Comparing a Sensor for Movement Assessment With Traditional Clinical Assessment Methods in Patients After Knee Surgery.

Conditions
-----------------
Status After Knee Surgery

Intervention / Treatment
-----------------
* Diagnostic Test: Orthelligent Pro


Participation Criteria
=================
Eligibility Criteria
-----------------
Inclusion Criteria: Patients after knee surgery (ACL reconstruction, total or partial knee arthroplasty, knee arthroscopy etc.) who are scheduled to a clinical follow up assessment by the surgeon between 4 months and 15 months after surgery. Informed consent Exclusion Criteria: Age below 18 years Patients who underwent surgery in the lower extremities within the last 4 months Patients with severe acute pain Patients with contraindications to perform the movements/exercises Patients who underwent surgery also at the contralateral leg since the surgery related to the current follow up visit Patients who cannot follow the instructions due to language or cognitive problems

Ages Eligible for Study
-----------------
Minimum Age: 18 Years

Sexes Eligible for Study
-----------------
All

Accepts Healthy Volunteers
-----------------
No

Study Plan
=================
How is the study designed?
-----------------

Design Details

Primary Purpose: Diagnostic
Intervention Model: Single Group Assignment
Interventional Model Description: Paired measurements with two different measurement methods
Masking: None (Open Label)


Arms and Interventions

| Intervention/Treatment |
| --- |
|Diagnostic Test: Orthelligent Pro|The sensor is attached to the knee of the participant and eight different movement exercises are performed|

What is the study measuring?
-----------------
Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Tilt angle of the leg in degrees during passive movement of the leg (knee joint) |  | At the single study visit directly after enrollment of the patient. | 
| Tilt angle of the leg in degrees during active movement of the leg (knee joint) |  | At the single study visit directly after enrollment of the patient. | 
| Tilt angle of the leg in degrees during leg stretching |  | At the single study visit directly after enrollment of the patient. | 
| Inward tilt of the lower leg in degrees/on an ordinal assessment scale during one-legged squat |  | At the single study visit directly after enrollment of the patient. | 
| Angle reproduction when moving the lower leg to three randomly chosen angles |  | At the single study visit directly after enrollment of the patient. | 
| Jump height at vertical jump (on one leg) |  | At the single study visit directly after enrollment of the patient. | 
| Inward tilt of the lower leg in degrees/on an ordinal assessment scale at drop jump |  | At the single study visit directly after enrollment of the patient. | 
| Number of jumps during 30s side hops |  | At the single study visit directly after enrollment of the patient. |