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General Anesthesia: Overview01:24

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Local Anesthetics: Clinical Application as Spinal Anesthesia01:11

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Spinal anesthetics are given during lower abdomen and limb surgeries to block sensory and motor neurons. They are administered in the mid to low lumbar regions, primarily acting on the cauda equina's nerve roots. The blockade level depends on the local anesthetic (LA) concentration. Usually, low LA concentrations are sufficient to block sensory fibers, while only high LA concentrations block motor fibers. Other factors like injection volume and speed, the patient's posture, and the drug...
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Local Anesthetics: Clinical Application as Epidural Anesthesia01:29

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Examination under Anesthesia in Patients with Recurrent Patellar Dislocation: Prognostic Study.

Ismail Fathalla1, James Holton1, Tanweer Ashraf1

  • 1Department of Arthroscopy, Royal Orthopaedic Hospital, Birmingham, United Kingdom.

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Examination under anesthesia (EUA) can predict outcomes for patellar instability surgery. Patients with a dislocating patella on EUA beyond 30 degrees of flexion may not benefit from isolated medial patellofemoral ligament reconstruction.

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Area of Science:

  • Orthopedic Surgery
  • Sports Medicine
  • Biomechanics

Background:

  • Surgical management of patellar instability is debated, with differing opinions on isolated medial patellofemoral ligament (MPFL) reconstruction versus addressing underlying pathologies like patella alta and trochlear dysplasia.
  • Radiological studies traditionally guide treatment decisions for these pathologies, but their predictive value can be limited.
  • The utility of examination under anesthesia (EUA) in surgical planning for patellar instability remains unclear.

Purpose of the Study:

  • To evaluate the prognostic value of EUA in patients undergoing surgical treatment for recurrent patellar dislocations.
  • To determine if EUA findings can predict the success of isolated MPFL reconstruction.

Main Methods:

  • Retrospective review of 23 patients who underwent isolated MPFL reconstruction for recurrent patellar dislocations.
  • Data collected included patient demographics, radiological measurements (TT-TG, Caton-Deschamps ratio), and EUA findings.
  • Primary outcome was recurrent instability requiring revision surgery.

Main Results:

  • Nine out of 23 patients (39%) experienced recurrent instability after isolated MPFL reconstruction.
  • Failure occurred at a median of 10.5 months post-surgery.
  • All patients who failed had a dislocating patella on EUA at greater than 30 degrees of knee flexion.

Conclusions:

  • EUA provides valuable information for surgical planning in patellar instability.
  • Isolated MPFL reconstruction may be insufficient for patients exhibiting patellar dislocation beyond 30 degrees of flexion during EUA.
  • Further research with larger cohorts is needed to confirm these findings.