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Anatomic Study of Hip Pericapsular Muscle Arrangement on the Joint Capsule
Masahiro Tsutsumi1,2, Akimoto Nimura3, Hajime Utsunomiya4
1Inclusive Medical Sciences Research Institute, Morinomiya University of Medical Sciences, Osaka, Japan.
JB & JS Open Access
|March 17, 2025
Summary
Pericapsular muscles form a spiral pattern on the hip joint capsule, connecting via tendons or perimysium. This arrangement is vital for maintaining femoral head stability through centripetal forces.
Area of Science:
- Anatomy
- Biomechanics
- Histology
Background:
- The role of pericapsular muscles in hip stability is not fully understood.
- Their precise action on the femoral head and neck via the joint capsule requires anatomical clarification.
Purpose of the Study:
- To investigate the arrangement of pericapsular muscles on the hip joint capsule.
- To determine their positional relationship to the femoral head and neck.
- To examine their histological connections to the joint capsule.
Main Methods:
- Analysis of eight hips from seven human cadavers (average age 72.5 years).
- Macroscopic assessment of pericapsular muscle arrangement on the joint capsule.
- Histological examination of muscle-capsule continuity.
Main Results:
- Pericapsular muscles exhibited a spiral, clockwise arrangement around the femoral neck axis.
- Gluteus minimus showed histological continuity with the joint capsule via tendon.
- Other muscles (iliopsoas, obturator externus, obturator internus) connected through their perimysium.
Conclusions:
- Pericapsular muscles are arranged in a spiral pattern on the joint capsule.
- They possess histological continuity through tendons or perimysium.
- This arrangement facilitates centripetal force generation for femoral head stability.
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