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Related Experiment Videos

Peroneus quartus muscle: MR imaging features

Y Y Cheung1, Z S Rosenberg, R Ramsinghani

  • 1Department of Radiology, St Vincent's Hospital, New York, NY 10011, USA.

Radiology
|March 1, 1997
PubMed
Summary
This summary is machine-generated.

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The peroneus quartus (PQ) muscle, an accessory foot muscle, was found in 10% of cases. It inserts on the calcaneus, associated with a taller retrotrochlear eminence, not an enlarged peroneal tubercle.

Area of Science:

  • Anatomy
  • Medical Imaging
  • Orthopedics

Background:

  • The peroneus quartus (PQ) muscle is an accessory muscle of the lateral compartment of the leg.
  • Its prevalence and anatomical variations are not fully understood.
  • Previous studies suggested an association between the PQ muscle and peroneal tubercle hypertrophy.

Purpose of the Study:

  • To determine the prevalence of the peroneus quartus (PQ) muscle.
  • To describe the morphology of the PQ muscle on magnetic resonance (MR) imaging.
  • To re-evaluate the association between the PQ muscle and peroneal tubercle size.

Main Methods:

  • Retrospective review of 136 ankle MR imaging studies.
  • Recorded origins, insertions, and size variations of the PQ muscle.

Related Experiment Videos

  • Measured dimensions of the peroneal tubercle and retrotrochlear eminence.

    • Main Results:

    • The PQ muscle was identified in 10% (14/136) of cases.
    • The PQ muscle inserted variably, most commonly on the calcaneus (11/14 cases), specifically on the retrotrochlear eminence.
    • The retrotrochlear eminence was significantly taller in individuals with the PQ muscle (P < .01).

    Conclusions:

    • The peroneocalcaneal variant of the PQ muscle inserts on the retrotrochlear eminence, not the peroneal tubercle.
    • The presence of the PQ muscle is associated with a prominent retrotrochlear eminence.
    • No association was found between the PQ muscle and an enlarged peroneal tubercle.