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Directly acting muscle relaxants like dantrolene and botulinum toxin (BoNT) have distinct mechanisms and applications. Dantrolene, a hydantoin derivative, acts on the ryanodine receptor (RYR1) in skeletal muscle cells. RYR1 are calcium channels present at the sarcoplasmic reticulum membrane. In response to excitation, they release calcium ions from the sarcoplasmic reticulum to the cytosol. Calcium promotes actin-myosin-mediated contraction of muscles.
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Intravenous regional anesthesia or the Bier block technique is used to anesthetize a specific limb or extremity. It uses exsanguinated or blood-drained vessels to transport local anesthetics or LAs to the peripheral nerve trunks. Lidocaine without vasoconstrictors like epinephrine is most commonly used for this technique. Other drugs used are prilocaine, ropivacaine, and chloroprocaine. Bupivacaine is not recommended for this technique due to its high cardiac toxicity.
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Centrally acting muscle relaxants reduce muscle tone and tension by interfering with the postsynaptic reflexes in the central nervous system.
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Micro-Computed Tomography Analysis of the Knee in Aged Dunkin-Hartley Guinea Pigs after Intra Articular Injection
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Joint and Soft Tissue Injections.

Julie A Creech-Organ1, Sarah E Szybist2, Jacqueline L Yurgil3

  • 1Saint Louis University/Scott Air Force Base Family Medicine Residency, O'Fallon, Illinois.

American Family Physician
|August 17, 2023
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Summary
This summary is machine-generated.

Joint and soft tissue injections, both diagnostic and therapeutic, offer targeted pain relief and diagnosis. While effective for specific conditions like tendinopathy, careful patient selection and consideration of potential complications are crucial for optimal outcomes.

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Area of Science:

  • Musculoskeletal medicine
  • Interventional pain management
  • Regenerative medicine

Background:

  • Joint and soft tissue injections are common procedures for diagnosing and treating musculoskeletal conditions.
  • These injections can be broadly classified into diagnostic and therapeutic categories.
  • Various injectates, including corticosteroids, hyaluronic acid, dextrose prolotherapy, and platelet-rich plasma, are used therapeutically.

Purpose of the Study:

  • To review the diagnostic and therapeutic applications of joint and soft tissue injections.
  • To discuss the accuracy, indications, contraindications, and potential complications associated with these procedures.
  • To highlight the importance of direct visualization and optimizing conservative treatments.

Main Methods:

  • Review of current literature on diagnostic and therapeutic joint and soft tissue injections.
  • Analysis of different injectates and their efficacy for specific conditions.
  • Discussion of procedural preparation, contraindications, and potential adverse events.

Main Results:

  • Diagnostic injections use local anesthetics or fluid aspiration for pain localization and analysis.
  • Therapeutic injections include corticosteroids (for adhesive capsulitis, tenosynovitis), hyaluronic acid (limited for knee OA), dextrose prolotherapy (for tendinopathy, degenerative joint pain), and platelet-rich plasma (effective for common extensor tendinopathy, knee arthritis).
  • Direct visualization enhances accuracy; potential complications include pain, swelling, atrophy, and degeneration with repeated corticosteroid use.

Conclusions:

  • Joint and soft tissue injections are valuable tools when used appropriately for specific indications.
  • Corticosteroid injections have limitations, particularly intratendinous use, and risks with repeated administration.
  • Platelet-rich plasma shows promise for specific conditions, while hyaluronic acid has limited efficacy for knee osteoarthritis. Conservative management should be optimized.