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Questions and Answers
Where do clavicle fractures typically occur?
Where do clavicle fractures typically occur?
What is a common complication of clavicle fractures?
What is a common complication of clavicle fractures?
What role does the clavicle play in the upper extremity skeleton biomechanics?
What role does the clavicle play in the upper extremity skeleton biomechanics?
Which group is more prone to clavicle fractures according to the text?
Which group is more prone to clavicle fractures according to the text?
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How do clavicle growth rates in females compare to males?
How do clavicle growth rates in females compare to males?
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What is the primary function of the clavicle?
What is the primary function of the clavicle?
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How long is the clavicle approximately?
How long is the clavicle approximately?
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Which artery primarily supplies the periosteal vascularization of the clavicle?
Which artery primarily supplies the periosteal vascularization of the clavicle?
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Why does the unique structure of the clavicle encourage using fixation plates or intramedullary devices?
Why does the unique structure of the clavicle encourage using fixation plates or intramedullary devices?
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At what age range does clavicular growth significantly decrease in male patients?
At what age range does clavicular growth significantly decrease in male patients?
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Which region does the clavicle directly connect to in the body?
Which region does the clavicle directly connect to in the body?
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Study Notes
The Clavicle: Structure, Function, and Common Injuries
Introduction
The clavicle, also known as the collarbone, is a flat, horizontal bone located between the sternum and acromion. It serves as the primary connection between the axial skeleton and the upper limb, providing mechanical stability and facilitating movements such as flexion, extension, and rotation of the arm.
Anatomy
The clavicle is composed of three parts: the sternal end, the middle third, and the acromial end. The bone is approximately 20 cm long and 1 cm wide, making it an essential component of the upper extremity skeleton.
Blood Supply
The clavicle's periosteal vascularization is primarily supplied by the middle part of the suprascapular artery along the posteroinferior surface and anastomosing vessels connecting the medial clavicular physis to the acromion.
Muscle Attachment
The muscle footprint anatomy of the clavicle varies widely due to its unique structure, which encourages the use of fixation plates or intramedullary devices that respect the muscle footprints.
Growth and Development
Contrary to popular belief, the clavicle continues to grow during adolescence and early adulthood, with growth rates varying among different age groups. In male patients aged 12 to 15 years, clavicular growth is approximately 4.9 mm/year; from ages 16 to 19 years, growth decreases to 3.2 mm/year; and from ages 20 to 25 years, growth further reduces to 1.7 mm/year. Female clavicles exhibit similar patterns but with slightly lower growth rates.
Common Injuries
Clavicle fractures are common injuries, particularly in young adults involved in sports activities and older adults experiencing falls. They typically occur in the middle third of the bone, followed by the distal third. Most fractures heal with conservative treatment methods such as immobilization and pain management. However, complications like delayed union or nonunion may arise in some cases.
Conclusion
The clavicle plays a vital role in the biomechanics of the upper extremity skeleton, facilitating movement while also maintaining stability. Understanding its structure, blood supply, muscle attachment, growth patterns, and common injuries helps provide insight into its function and clinical implications.
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Description
Test your knowledge on the structure, function, growth, and common injuries of the clavicle, a crucial bone in the upper extremity. Learn about muscle attachments, blood supply, and clinical implications of clavicle fractures.
