Diseases of Tendons and Fascia

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Tendon & Fascia Basics - The Body's Tethers

  • Tendons: Dense connective tissue; connect muscle to bone; transmit tensile forces.
    • Structure: Parallel collagen fibers (primarily Type I), fibroblasts (tenocytes), proteoglycans.
    • Blood Supply: Limited, mainly at musculotendinous & osteotendinous junctions.
  • Fascia: Sheets of connective tissue; envelop muscles, organs, vessels.
    • Types: Superficial, deep, visceral.
    • Function: Support, compartmentalization, force transmission.

Tendon Histology: Physiological vs. Pathological Fibers

⭐ Tendons are predominantly composed of Type I collagen, providing high tensile strength.

  • Innervation: Sensory nerves for proprioception and nociception (pain).

General Tendinopathies - Strained Strands Saga

  • Tendinopathy: Umbrella term for tendon disorders, often from overuse or repetitive microtrauma.

  • Pathogenesis: Imbalance between tendon matrix degeneration & synthesis.

    • Failed healing response leads to chronic changes.
  • Spectrum of Tendon Injury:

    • Reactive Tendinopathy: Acute overload, non-inflammatory proliferative response, tendon thickening. Reversible.
    • Tendon Dysrepair: Attempted healing, ↑ proteoglycans, collagen disorganization, neurovascular ingrowth. Possible reversibility.
    • Degenerative Tendinopathy (Tendinosis): Chronic, cell death, matrix breakdown, extensive disorganization, minimal inflammation. Less reversible.

Tendinosis is a degenerative process characterized by collagen disorganization, increased ground substance, and neovascularization, distinct from primarily inflammatory tendinitis.

  • Clinical: Pain with activity, localized tenderness, palpable nodule (in tendinosis).
  • Histology:
    • Tendinitis: Acute inflammation (neutrophils, macrophages). Rare in chronic cases.
    • Tendinosis: Collagen fiber disarray (Type III > Type I), ↑ ground substance (mucoid degeneration), neovascularization, hypercellularity (tenocytes, myofibroblasts), no significant inflammation.

Tendinopathy: Pathology, Clinical Features, Treatments

  • Common sites: Achilles, patellar, rotator cuff, elbow (epicondylitis).

Fascial Pathologies - Fascia's Fierce Fight

  • Plantar Fasciitis:
    • Etiology: Repetitive microtrauma (e.g., running), obesity, improper footwear.
    • Pathology: Plantar fascia degeneration (calcaneal origin); fibroblastic proliferation, collagen disarray.
    • Clinical: Heel pain (worse AM/after rest); medial calcaneal tenderness.
  • Dupuytren's Contracture (Palmar Fibromatosis):
    • Pathogenesis: Palmar fascia thickens: nodules → cords → contractures.

    Dupuytren's contracture is characterized by palmar fascial thickening due to proliferation of myofibroblasts and altered collagen (increased Type III).

    • Clinical: Painless palmar nodules, progressive flexion contractures (typically 4th & 5th digits, MCP/PIP). Positive "tabletop test".
    • Associations: Northern European, alcohol, smoking, DM, epilepsy. 📌 "Dupuytren's: Digits Draw Down"
  • Ledderhose Disease (Plantar Fibromatosis):
    • Plantar foot nodules; like Dupuytren's but in feet. May be painful. Dupuytren's Contracture Illustration

Specific Tendon Syndromes - Spotlight on Sorrows

  • Achilles Tendinopathy: Overuse; pain posterior heel/calf. ↑Risk: fluoroquinolones. Degeneration.
  • Rotator Cuff Tears: Supraspinatus (abduction initiation) common. Pain on abduction/overhead. Drop arm test +.
    • Rotator cuff tear MRI
  • Lateral Epicondylitis (Tennis Elbow): Extensor Carpi Radialis Brevis origin. Pain lateral elbow, wrist extension.
  • Medial Epicondylitis (Golfer's Elbow): Common flexor-pronator origin. Pain medial elbow, wrist flexion.
  • De Quervain's Tenosynovitis: Abductor Pollicis Longus (APL) & Extensor Pollicis Brevis (EPB) tendons (1st dorsal compartment).

    Finkelstein's test (passive ulnar deviation of wrist, thumb flexed in palm) is pathognomonic for De Quervain's tenosynovitis.

  • Ganglion Cyst: Mucin-filled synovial cyst (often wrist). Transilluminates. Usually asymptomatic.

High‑Yield Points - ⚡ Biggest Takeaways

  • Tendinopathy is primarily degenerative due to failed healing, not inflammatory.
  • De Quervain's tenosynovitis affects APL & EPB tendons; Finkelstein test is key.
  • Trigger finger (stenosing tenosynovitis): A1 pulley thickening causes digit locking.
  • Dupuytren's contracture: Palmar fibromatosis (nodules, cords); common in Northern Europeans, associated with diabetes, alcoholism.
  • Ganglion cyst: Mucinous degeneration near joints or tendon sheaths; transilluminates.
  • Achilles tendinopathy: Common overuse injury; pain at mid-portion or calcaneal insertion.

Practice Questions: Diseases of Tendons and Fascia

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Finkelstein test is used for diagnosis of?

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Flashcards: Diseases of Tendons and Fascia

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In pseudoarthrosis, the central portion of the callus undergoes _____ degeneration

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In pseudoarthrosis, the central portion of the callus undergoes _____ degeneration

cystic

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