The study does not investigate a disease but examines normal anatomical conditions in healthy adult individuals. The aim is to determine the course of the radial nerve in the upper arm in order to better assess and prevent the risk of nerve injury during future surgeries or in cases of upper arm trauma.
Conditions
Interventions
Group 1: Prospective controlled study:
Arm 1 (right upper arm):
Healthy adult participants will undergo a single ultrasound examination. During this procedure, the course of the radial nerve in the ri
in a subgroup, a repeat measurement will be performed after at least 5 days (intrarater reliability), as well as a second measurement by a different examiner (interrater reliability). The total observ
Sponsors
Klinikum Stuttgart
Eligibility
Sex/Gender
All
Age
18 Years to No maximum
Inclusion criteria
Inclusion criteria: Healthy adult individuals aged 18 years or older Ability to give informed consent and sign the written consent form Anatomically normal upper arms on both sides (no prior surgery, trauma, or congenital abnormality) Ability to remain in a prone position for approximately 30 minutes during examination Reliable self-reported information regarding body height, weight, and handedness
Exclusion criteria
Exclusion criteria: Minors or individuals unable to provide informed consent Previous surgery, fracture, or congenital malformation of the upper arm Current or past inflammation, infection, or oncological disease in the examined region Ambidextrous or retrained handedness Physical or cognitive impairments that prevent adequate participation or accurate data collection
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| Distance of the radial nerve to defined bony landmarks (acromion, acromioclavicular joint, lateral and medial epicondyle, and olecranon fossa) of the upper arm, measured in millimeters at skin level using high-resolution ultrasound. The objective is to determine the course of the nerve in relation to palpable anatomical landmarks. Time of assessment: Single measurement per arm during the ultrasound examination (duration approximately 30 minutes). In a subgroup, a repeated measurement will be performed after at least 5 days to determine intrarater reliability. Method of data collection: Direct sonographic measurement and manual distance measurement using a flexible tape measure; documentation on standardized case report forms and transfer into a pseudonymized electronic database. | — |
Secondary
| Measure | Time frame |
|---|---|
| Assessment of measurement reliability of the sonographic localization of the radial nerve: Intrarater reliability: Repeated measurement on the same participants after at least 5 days by the same examiner. Interrater reliability: Second measurement by another examiner on the same participants. Time of assessment: Both repeated measurements will be performed within a maximum of 14 days after the initial examination. Method of data collection: Sonographic replication of the initial measurement at identical anatomical points; documentation on standardized case report forms and pseudonymized data storage in the electronic study database. | — |
Countries
Germany
Contacts
Public ContactTobias Merkle
Klinikum Stuttgart
Outcome results
None listed