Adson Test, Wright Hyperabduction, and Roos EAST: Diagnostic Accuracy in TOS

Evaluating thoracic outlet syndrome presents unique diagnostic challenges due to the anatomical complexity of the cervico-axillary region and the high prevalence of false-positive physical examination findings in asymptomatic populations. Clinicians have traditionally relied on three classic provocative tests: the Adson test for interscalene compression, the Wright hyperabduction test for retropectoral minor entrapment, and the Roos Elevated Arm Stress Test (EAST) for dynamic costoclavicular compromise. However, using pulse obliteration alone as a positive indicator has been thoroughly debunked, as vascular dampening occurs in up to fifty percent of healthy individuals during overhead arm positioning. Modern clinical assessment demands meticulous execution protocols that prioritize the reproduction of familiar neurological symptoms over isolated pulse changes.

Clinical Pitfalls in High-Volume Indian Outpatient Clinics

In busy outpatient physiotherapy departments and orthopedic clinics across Indian cities, clinicians often face heavy patient volumes and limited examination time. Rapidly performing a single provocative maneuver, such as grabbing the wrist and asking the patient to look over their shoulder, frequently yields misleading results. Many desk workers, gym-goers, and students exhibit resting muscular tension that dampens distal pulses without any true brachial plexus pathology. Conversely, patients with genuine neurogenic thoracic outlet syndrome may be misdiagnosed with cervical radiculopathy or carpal tunnel syndrome if multi-compartment provocative testing and detailed neurological screening are rushed or omitted.

Maneuver Biomechanics, Sensitivity, Specificity, and Cluster Testing

The Adson test evaluates interscalene narrowing by combining shoulder extension, slight abduction, deep inspiration (drawing the first rib upward via scalene contraction), and cervical extension with rotation toward the symptomatic side. Its diagnostic sensitivity ranges from sixty to seventy percent, with modest specificity. The Wright hyperabduction test assesses retropectoral minor tension by moving the arm into 180 degrees of abduction and external rotation, stretching the neurovascular bundle under the pectoralis minor tendon. The Roos EAST test requires the patient to hold both arms abducted to 90 degrees with elbows bent at 90 degrees and slowly open and close their hands for three full minutes. The inability to maintain the position, marked ischemic arm heaviness, or reproduction of familiar paresthesia provides high clinical sensitivity (84 to 90 percent) for neurogenic compression.

Structuring Evidence-Based Clinical Clusters for Accurate Diagnosis

Because no single physical test provides definitive diagnostic accuracy, best clinical practice relies on a validated cluster of provocative maneuvers combined with detailed palpation and neural tension tests. An evidence-based cluster includes the Roos EAST test, the Morley test (brachial plexus compression in the supraclavicular fossa), the Lindgren cervical rotation lateral flexion test, and upper limb neurodynamic testing (ULNT 1). When three or more of these tests reproduce the patient familiar arm, forearm, or hand complaints, diagnostic confidence increases substantially, allowing the physiotherapist to tailor conservative rehabilitation directly to the implicated anatomical tunnel.

Frequently Asked Questions