Mobile Application Utilization for Measurement of Scapular Position

Subjects will be asked to provide demographic and background information such as age, height,
history of pain or injury, and descriptions of their physical activity levels. Subjects will
receive a clinical screening exam by a licensed physical therapist to determine the type of
movement abnormalities present, the severity of their symptoms and to screen for inclusion
and exclusion criteria.

To collect scapular position measurement reliability data, subjects will stand through out
data collection. Measurements of the scapula will be taken with the mobile application for
the arm at rest and in two elevated position. Subjects will wear an off-the-shelf elbow brace
when asked to hold their arm in the two elevated positions. These elevated positions will be
maintained by having subjects maintain contact of their forearm against a guide. For
intra-rater reliability, position measurements will be repeated twice for each of three
planes of elevation. Additionally, for inter-rater reliability each measurement will be
repeated once by two other examiners. This process will repeated twice when using the
application with and without the handle.

For the validation portion of the study, a subgroup of subjects will have the same position
measurements performed by a single examiner with additional motion sensors taped to the skin
of their scapula and breast bone and a sensor attached to an arm brace strapped to their arm.

In total, the subject will be asked to raise and hold their arm for approximately 5 sec, 36
times during the testing within ranges of motion typically performed during daily activities.

Inclusion Criteria:

1. Asymptomatic subjects: subjects without complaints or history of shoulder pain or
obvious movement abnormalities.

2. Symptomatic subjects: subjects with shoulder pain who have active range of motion
beyond 120° of elevation.

Exclusion Criteria:

1. Symptomatic and asymptomatic subjects: history of trauma including fractures,
dislocations, previous shoulder surgeries within the past 6 weeks. Humeral elevation
less than 120 degrees, shoulder symptomology that is judged by the examiner to be of
cervical origin.

2. Asymptomatic subjects: Complaints of shoulder pain, positive results on joint tests
commonly associated with shoulder impingement, presence of shoulder joint movement
abnormalities as determined by a physical therapist, including thoracic scoliosis.