Clavicle Lecture Case Study Prep | Lecture Note

University:
The University Of Western Ontario
Course:
Pathology 3500B | Human Pathology
Academic year:

2023
Views:

302

Pages:

3
Author:

Kyuwon J.

Clavicle ● S- shaped bone ○ Connecting axial skeleton ○ Upper limb ○ Strut = keeps scapula away from thorax ■ Wide angle of shoulder ■ Most commonly fractured bone ○ Structural support ■ Holds shoulder laterally ○ Force transmission ■ Transfers force to upper limb on axial skeletons ○ Protections ■ Neurovascular structures ● Branchial plexus ● Subclavian vessels Anatomical features ● Positions ○ Long curved bone ○ Double curve ■ Medial convex -anterior ■ Lateral concave - anteriorly ○ Horizontally in base of neck ○ Palpable ● Ends ○ Sternal end ■ Articulates manubrium of sternum ■ Sternoclavicular joints ○ Acromial end ■ Lateral ● Articulation with acromion of scapula ● Moves to acromioclavicular joints ● Surface landmark ○ Superior surface ■ Smooth ■ Subcutaneous ■ Palpable ○ Inferior surface ■ Conoid tubercle ● Attaches to coronoid ligaments ● Trapezoid line ○ Trapezoid ligament ● Subclavian groove ○ Unclavius muscles Articulations ● Sternoclavicular joints ○ True body articulation ○ Upper limb + axial skeletons ● Acromioclavicular joints ○ Stabilization of clavicle Both reinforced by ligaments Muscle Attachments ● Sternocleiomastoids ● Pectoralis major ○ Anterior surface ● Sternohyoid ○ Medial end ○ Posterior surface ● Lateral half ○ Deloids ■ Anterior surface ■ Originations from anterior surface (lateral clavicle) ○ Trapezius ■ Posterior surface ● Inferior surface ○ Subclvius ■ Subclavian groove Clavicle Region Medial (Sternal) Attached Muscle(s) Layer Sternocleidomastoid (superior surface) Superior Pectoralis major (anterior surface) Anterior Sternohyoid (posterior end) Posterior medial Inferior Groove Subclavius Inferior (subclavian groove) Lateral (Acromial) Deltoid (anterior surface) Anterior Trapezius (posterior surface) Posterior Case study “16 year old male falls on shoulder feels pain and swelling “step deformity on mid clavicle” ● Displaced midshaft clavicular fracture ○ Midshaft of clavicle thinnest + weakest regions ○ No strong ligamentous + muscular reinforcement ■ Protection of media lateral ends ● Medical ends = supported in sternocleidomastoids and sternohyoids ● Lateral ends = stabilization of acromioclavicular joints, coracoclavicular ligaments ● Midshaft = relatively unprotected = weakpoint