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Tendon – Structure, Function and Conditions

A tendon is a tough band of fibrous connective tissue that connects muscles to bones, enabling movement. Tendons are composed mainly of collagen and are a vital part of the musculoskeletal system.

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Things worth knowing about "Tendon"

A tendon is a tough band of fibrous connective tissue that connects muscles to bones, enabling movement. Tendons are composed mainly of collagen and are a vital part of the musculoskeletal system.

What is a Tendon?

A tendon (Latin: Tendo) is a firm, fibrous band of connective tissue that connects a muscle to a bone. Tendons transmit the force generated by a muscle to the bone, enabling precise and coordinated body movements. They are an essential component of the human musculoskeletal system.

Structure and Composition

Tendons are composed primarily of collagen fibers, mainly collagen type I, arranged in parallel bundles. This architecture gives tendons their remarkable tensile strength combined with flexibility. Between the collagen fibers are specialized cells called tenocytes, which are responsible for producing and maintaining the collagen matrix.

Collagen fibers: Provide the tendon with stability and load-bearing capacity.
Tenocytes: Specialized cells responsible for collagen production and repair.
Tendon sheath (Vagina tendinis): A protective covering surrounding many tendons, providing lubrication via synovial fluid to allow smooth gliding.
Peritendineum: The connective tissue that encases individual tendon bundles.

Function of Tendons

The primary function of a tendon is the transmission of force from muscle to bone. When a muscle contracts, the tendon transfers this pulling force to the bone, resulting in joint movement. Tendons can withstand considerable tensile loads and also act as energy storage structures, which is particularly important during walking and running. The Achilles tendon is a well-known example of this energy-storing function.

Common Tendon Conditions

Tendinitis (Tendon Inflammation)

Tendinitis is an inflammation of the tendon, typically caused by overuse, injury, or degenerative changes. It commonly presents with pain, swelling, and reduced range of motion in the affected area.

Tendinosis

Tendinosis refers to degenerative changes within the tendon structure without acute inflammation. It is often the result of chronic overuse and is characterized by disorganized collagen fibers and reduced tendon quality.

Tendon Rupture

A tendon rupture can be partial or complete. Commonly affected tendons include the Achilles tendon, the rotator cuff tendons of the shoulder, and the quadriceps tendon at the knee. A rupture is often accompanied by an audible snap, sudden severe pain, and loss of function in the affected muscle.

Tendovaginitis (Tendon Sheath Inflammation)

Tendovaginitis involves inflammation of the tendon sheath, leading to pain, swelling, and a characteristic creaking or grating sensation during movement. It frequently affects the hand, wrist, and foot.

Diagnosis of Tendon Conditions

Diagnosis is based on a combination of:

Clinical examination: Palpation, range of motion assessment, and specific provocation tests.
Ultrasound (sonography): Allows real-time assessment of tendon structure, inflammation, and tears.
Magnetic Resonance Imaging (MRI): Provides detailed cross-sectional images to evaluate the extent of tendon changes or ruptures.
X-ray: Used to rule out bony involvement or calcifications within the tendon.

Treatment of Tendon Conditions

Treatment depends on the type and severity of the condition:

Conservative therapy: Rest, ice application, anti-inflammatory medications (NSAIDs), physiotherapy, and targeted stretching and strengthening exercises.
Shockwave therapy: Used for chronic tendon conditions to stimulate the healing process.
PRP therapy (Platelet-Rich Plasma): Injections with the patient's own plasma concentrate to promote tendon healing.
Surgical treatment: In cases of complete tendon rupture or treatment-resistant conditions, surgical repair or reconstruction may be required.

References

Kannus P. - Structure of the tendon connective tissue. Scandinavian Journal of Medicine and Science in Sports. 2000;10(6):312-320.
Maffulli N., Wong J., Almekinders L.C. - Types and epidemiology of tendinopathy. Clinics in Sports Medicine. 2003;22(4):675-692.
Benjamin M., Kaiser E., Milz S. - Structure-function relationships in tendons: a review. Journal of Anatomy. 2008;212(3):211-228.

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