**Question:** A 43-year-old man visits the outpatient clinic with a painful shoulder. Physical examination reveals a painful arc syndrome due to supraspinatus tendinopathy. Which of the following conditions will be present during physical examination?

A. Impingement
B. Subacromial sprain
C. Frozen Shoulder
D. Rotator Cuff Tendonitis

**Correct Answer:** **D. Rotator Cuff Tendonitis**

**Core Concept:**
Supraspinatus tendinopathy refers to inflammation or damage to the supraspinatus tendon, a key tendon that connects the supraspinatus muscle to the humerus bone in the shoulder joint. The patient's painful arc syndrome is indicative of impingement, a condition where the rotator cuff tendons and bursa become inflamed due to mechanical compression or irritation during shoulder movement.

**Why the Correct Answer is Right:**
During physical examination, a painful arc syndrome would be present in a patient with supraspinatus tendinopathy. This is because the supraspinatus tendon is involved in the painful arc syndrome, which is characterized by pain occurring during abduction and external rotation of the affected shoulder. In this case, the correct answer is "Rotator Cuff Tendonitis" (D) because it is the most relevant condition causing painful arc syndrome due to inflammation or damage to the supraspinatus tendon.

**Why Each Wrong Option is Incorrect:**
A. Impingement (A) is not the correct answer because it refers to the condition where the rotator cuff tendons and bursa become inflamed due to mechanical compression or irritation during shoulder movement. It does not specifically address the patient's condition, which is supraspinatus tendinopathy.

B. Subacromial sprain (B) is incorrect because it refers to a traumatic injury to the rotator cuff tendons or bursae resulting from a sudden forceful movement or trauma. In this case, the patient is experiencing chronic inflammation or damage to the supraspinatus tendon, not a traumatic injury.

C. Frozen Shoulder (C) is not the correct answer because it is a condition characterized by pain, stiffness, and limited range of motion, predominantly affecting the shoulder joint. The patient described has an acute condition involving the supraspinatus tendon, not a chronic condition like Frozen Shoulder.

**Clinical Pearl:**
The clinical pearl here is to differentiate between traumatic injuries (subacromial sprain) and chronic inflammation or damage (supraspinatus tendinopathy) when examining patients with shoulder pain and limited range of motion. The correct diagnosis helps guide appropriate treatment and prognosis.