What is the light bulb sign?
Table of Contents
What is the light bulb sign?
The light bulb sign refers to the abnormal AP radiograph appearance of the humeral head in posterior shoulder dislocation. When the humerus dislocates it also internally rotates such that the head contour projects like a light bulb when viewed from the front 1.
What is trough sign?
The trough line sign is a sign of posterior shoulder dislocation on AP shoulder radiograph.
How can you tell the difference between anterior and posterior shoulder dislocation?
Lesson Summary
- Anterior shoulder dislocations describe a forward dislocation of the humerus, where the top of the bone is toward the front of the body.
- Posterior shoulder dislocations are characterized by the bone being forced behind the shoulder joint.
What is a reverse Hill Sachs lesion?
Reverse Hill-Sachs defect, also called a McLaughlin lesion, is defined as an impaction fracture of anteromedial aspect of the humeral head following posterior dislocation of the humerus. It is of surgical importance to identify this lesion and correct it to prevent avascular necrosis.
What does the upside down light bulb warning light?
What is the green light on my dashboard that looks like an upside down lightbulb. It’s likely an indicator that an exterior bulb has failed or is intermittently failing.
Will a bulb warning light fail MOT?
Indicators must all work, emit an orange light and flash between 60 and 120 times per second, so ‘lazy’ indicators will fail the MOT. Indicator bulbs tend to have an orange lacquer coating which can disintegrate over time requiring the bulbs to be replaced as they become white rather than orange.
What is posterior shoulder dislocation?
Posterior shoulder dislocations usually result from forceful contractions of the internal rotators that occur during seizures and electrical shock. This mechanism can force the humeral head posteriorly, out of its normal alignment and behind the glenoid. Less commonly, posterior shoulder dislocations follow trauma.
What is the hallmark of an anterior shoulder dislocation?
A patient with an anterior shoulder dislocation typically presents with an obvious squared-off shoulder, with the humeral head located inferior and medial to the normal anatomic location. Patients generally hold the injured arm in abduction and resist attempts to adduct or internally rotate the arm.
What is space between the clavicle and humeral head known as?
The acromioclavicular joint is where the acromion, part of the shoulder blade (scapula) and the collar bone (clavicle) meet. The glenohumeral joint is where the ball (humeral head) and the socket (the glenoid) meet.
What does a yellow light bulb mean?
Here’s a breakdown of light bulb color temperature: Soft white (2,700 to 3,000 Kelvin) is warm and yellow, the typical color range you get from incandescent bulbs. This light gives a warm and cozy feeling and is often best for living rooms, dens and bedrooms. Warm white (3,000 to 4,000 Kelvin) is more yellowish-white.
What does the orange light bulb mean?
Halloween. In October, you will see orange porch lights across America. This is considered a festive, lively color and is often used as a decoration for Fall and Halloween. The color orange is so closely associated with Halloween, that many people consider it to be a “Halloween” porch light.
Is a cracked rear light illegal?
Unless the bulb colour corresponds with the colour of the casing, then yes. For example, if your indicator light casing is broken but the actual bulb is orange then it’s fine. If you have white light showing a good temporary cover is sellotape or clear packing tape over the hole and a red sharpie to colour it in.
What is a Zanca view?
The Zanca view is a specialized projection of the acromioclavicular joint (ACJ), which will better demonstrate the acromioclavicular joint free from superimposition and aid in the assessment of distal osteophytes.
How do you test for posterior shoulder dislocation?
Posterior stress test The examiner stabilizes the shoulder with 1 hand and pushes the 90° flexed, adducted, and internally rotated shoulder posteriorly by the elbow. If the patient experiences pain and symptoms of instability, the test result is positive.
