Info The Course Of Written Report Of The N. Ischiadicus Inwards Relation To The Piriformis Syndrome
Piriformis muscle
Origin: Sacrum (facies pelvina ventrally)
Insertion: Trochanter major
Actions: Hip > ABD, EXT, EXT ROT
It is good known that the when the sciatic nervus that commonly passes nether the piriformis musculus is compressed, then radiating hurting inward the buttock, posterior thigh together with lower leg appears - together with this is known every bit the piriformis syndrome. What tin displace this syndrome?
1. Inactive gluteal muscles
I accept already posted an article on the lower cross syndrome. Based on this syndrome, usually, gluteal muscles snuff it calendar week - together with it is these muscles that play an of import role inward the hip extension together with adduction. When these muscles are weak, the piriformis musculus is "forced" to piece of work harder together with snuff it tight, compressing the sciatic nerve. Besides, overuse injury resulting inward piriformis syndrome tin effect from activities performed inward the sitting pose that involves strenuous occupation of the legs every bit inward rowing/sculling together with bicycling.
2. Hypomobile sacroiliac joints
Another purported displace for piriformis syndrome is stiffness, or hypomobility, of the sacroiliac joints. The resulting compensatory changes inward gait would together with so effect inward shearing of ane of the origins of the piriformis, together with perhaps roughly of the gluteal muscles every bit well, resulting inward piriformis malfunction.
3. Foot overpronation
Piriformis syndrome tin likewise move caused yesteryear overpronation of the foot. When a human foot overpronates it causes the articulatio genus to plow medially, causing the piriformis to activate to preclude over-rotating the hip. This causes the piriformis to snuff it overused together with thus tight, eventually leading to piriformis syndrome.
4. Falling injury
Piriformis syndrome may likewise move associated alongside falling injury.
Finally, it is interesting to know the course of written report of the n. ischiadicus inward relation to the piriformis musculus (after Rauber/Koprch).
The n. isciadicus leaves the lesser pelvis through the foramen infrapiriforme inward almost 85% of cases. However, it is possible (in close 15% of cases) that the fibular segmentation together with sometimes the n. cutaneous femoris porterior transcend through the piriformis musculus together with may snuff it compressed at that location. In exclusively close 0.5% of cases the fibular part of the n. isciadicus leaves the lesser pelvis to a higher house the piriformis muscle.
Reference: Schuenke M, Schutle E, Schumacher U. Thieme Atlas of Anatomy: General Anatomy of the Musculoskeletal System. New York: Thieme Medical Publishers, Inc.; 2006. p. 493.