Is the iliocapsularis muscle ubiquitous and consistent?

Abstract

The iliocapsularis muscle has been defined as originating from anterior superior iliac spine and iliac fossa and inserting into the lesser trochanter. Dissection of twenty-nine cadaveric hips yielded five iliocapsularis muscles, with two novel variations. Prevalence of iliocapsularis was found to be 17.2%. Iliocapsularis is important during dynamic hip stabilization and its role in preventing impingement of the anterior hip capsule. Therefore, understanding the current variations and prevalence may improve our understanding of the role of this muscle and its impact in the efficacy of surgical procedures in the area. The decreased prevalence of iliocapsularis muscles in the current study, the two variants, and the clinical significance is discussed.

Keywords

• hip
• iliocapsularis
• iliotrochantericus

References

1. Babst D, Steppacher SD, Ganz R, Siebenrock KA, Tannast M. The iliocapsularis muscle: an important stabilizer in the dysplastic hip. Clin Orthop Relat Res 2011;469:1728–34.
2. Walters BL, Cooper JH, Rodriguez JA. New findings in hip capsular anatomy: dimensions of capsular thickness and pericapsular contributions. Arthroscopy 2014;30:1235–45.
3. Lawrenson P, Grimaldi A, Crossley K, Hodges P, Vicenzino B, Semciw AI. Iliocapsularis: technical application of fine-wire electromyography, and direction specific action during maximum voluntary isometric contractions. Gait Posture 2017;54:300–3.
4. Plante D, Janelle N, Angers-Goulet M, Corbeil P, Takech MA, Belzile EL. Anatomical variants of the rectus femoris motor innervation. J Hip Preserv Surg 2019;6:170–6.
5. Elvan O, Aktekin M, Şengezer E, Kurtoğlu Olgunus Z, Bayramoğlu A. Iliocapsularis muscle in human fetuses. Surg Radiol Anat 2019;41:1497–503.
6. Sato T, Sato N, Sato K. Review of the iliocapsularis muscle and its clinical relevance. Anatomy & Physiology: Current Research 2016;6:237.
7. Satoh J. The m. iliotrochantericus (m. iliocapsulotrochantericus) in macaques. Okajimas Folia Anat Jpn 1965;40:323–37.
8. Segal RL, Wolf SL, DeCamp MJ, Chopp MT, English AW. Anatomical partitioning of three multiarticular human muscles. Acta Anat (Basel) 1991;142:261–6.

9. Ward WT, Fleisch ID, Ganz R. Anatomy of the iliocapsularis muscle. Relevance to surgery of the ghip. Clin Orthop Relat Res 2000;(374):278–85.
10. Pourcho AM, Sellon JL, Lachman N, Krych AJ, Smith J. Sonographic appearance of the iliocapsularis muscle of the hip. PM R 2015;7:94–6.