Neural Structures within Human Meniscofemoral Ligaments: A Cadaveric Study

Area of Science:

• Orthopedic Surgery
• Neuroanatomy
• Human Anatomy

Background:

• The meniscofemoral ligaments (MFLs) are intra-articular structures in the human knee.
• Their precise anatomical and functional roles, particularly regarding neural components, remain incompletely understood.

Purpose of the Study:

• To investigate the presence and nature of neural structures within the human knee's MFLs.
• To determine the potential contribution of MFLs to knee proprioception.

Main Methods:

• Harvesting of MFLs from 8 human cadaveric knees.
• Histological examination using Hematoxylin and Eosin (H&E) staining, S100 antibody staining for neural markers, and electron microscopy.
• Analysis of neural component ultrastructure.

Main Results:

• Neural structures were identified in 4 out of 9 examined MFLs via light and electron microscopy.
• S100 staining confirmed the presence of neural components.
• The ultrastructure of these neural elements resembled mechanoreceptors.

Conclusions:

• Neural structures are present in the meniscofemoral ligaments, particularly near their meniscal attachments.
• MFLs likely contribute to knee proprioception and neurosensory feedback, potentially playing an active role in joint stability.
• This proprioceptive function may be especially significant in posterior cruciate ligament-deficient knees.