Peroneus Tertius
Top Contributors - Sai Kripa, Kim Jackson, Patti Cavaleri, Claire Testa, Lilian Ashraf and Oyemi Sillo
Description
The Peroneus Tertius muscle, also called Fibularis Tertius, is one of the 3 fibularis muscles (fibularis longus, Fibularis Brevis).[1] It is the most superficial muscle in the anterior compartment of leg. Other muscles in the anterior compartment include tibialis anterior, extensor hallucis longus and Extensor Digitorum Longus[2]
The muscle's presence varies depending on the population studied. Prevalence in different populations has been reported to be the following[3]:
- Asian populations: 38.5%-95.5%
- West Asian populations: 38.5%-42%
- India: 87-90%
- China: 89.3%
- Japan: 95.5%
- Egypt: 52.8%
- Tunisia: 67.7%
- Chile: 49.1%
- Brazil: 93.8%
- Bolivia: 100%
- Spain: 38.2%
- Belgium: 81.5%
- Britain: 92.7%
- France: 90.9%
- Austria: 92.9%
- Poland: 85.8%
Anatomy
Origin
Distal half or third of the fibula[4]
Intermuscular septum[3]
Insertion
Before reaching it's insertion, the tendon passes under the extensor retinaculum of the foot with the Extensor Digitorum Longus tendon[3].
Dorsal surface of the base of the 5th metatarsal[4]
Nerve
Deep peroneal nerve[1]
Artery
Anterior tibial artery[2]
Function
- Assists with foot dorsiflexion and eversion[4]
- Works with extensor digitorum longus during swing phase of gait[3]
Clinical relevance
The strength of eversion and dorsiflexion is not compromised in people who lack the Fibularis Tertius muscle. Fibularis Tertius seems to not provide higher protection against ankle ligamentous injury.[6]
Fibularis Tertius Syndrome is a condition characterized by catching, clicking, locking or popping of peroneus tertius tendon over ankle during walking. It is a rare condition of anterolateral ankle pain or rear foot pain. This could be secondary to impingement and constriction of peroneus tertius in the extensor retinaculum.[2]
Fibularis tertius may be affected when a person has anterior compartment syndrome.[2]
The tendon may be used by surgeons as a donor for tendon transfer or tendoplasty procedures[3].
Assessment
Active motion or resisted motion for manual muscle testing involves combined ankle dorsiflexion and eversion.
References
- ↑ 1.0 1.1 Lippert, Lynn S. Clinical Kinesiology and Anatomy. 5th ed. Philadelphia: F A Davis Company; 2016.
- ↑ 2.0 2.1 2.2 2.3 Chaurasia BD. Human Anatomy Regional and Applied Dissection and Clinical. Vol 2. CBS Publishers and Distributors Pvt Ltd, 2010
- ↑ 3.0 3.1 3.2 3.3 3.4 Olewnik Ł. Fibularis Tertius: Anatomical Study and Review of the Literature. Clin Anat. 2019 Nov;32(8):1082-1093.
- ↑ 4.0 4.1 4.2 Witvrouw E, Vanden Borre K, Willems TM, Huysmans J, Broos E, De Clercq D. The significance of peroneus tertius muscle in ankle injuries: a prospective study. The American journal of sports medicine. 2006 Jul;34(7):1159-63.
- ↑ Nabil Ebraheim. Peroneus Tertius Muscle- Everything You Need To Know-Dr.Nabil Ebraheim Available from:https://www.youtube.com/watch?v=n6XWHKJg2OY [last accessed 11/05/2020]
- ↑ Witvrouw E, Vanden Borre K, Willems TM, Huysmans J, Broos E, De Clercq D. The significance of peroneus tertius muscle in ankle injuries: a prospective study. The American journal of sports medicine. 2006 Jul;34(7):1159-63.
- ↑ Ashley Reed. Peroneus Longus, Brevis, & Tertius - Reisch. Available from: https://www.youtube.com/watch?v=DDGDaKAmbc8 [last accessed 23/3/2022]