Abstract
Thirty-six cadavers (55 sides) were used to observe the innervation of the lateral collateral ligament (LCL) and its circumference structures with gross anatomical and histological methods to clarify the cause of indistinct pain in the lateral part of the knee joint. The innervating branches of the LCL could be divided into three types: (1) from the muscular branch of the biceps femoris muscle at lower 1/3 level of the thigh; (2) from the common fibular nerve (CFN) at the higher level of the fossa poplitea; (3) from the CFN at the level of the caput fibular. Furthermore, the three branches could singly or plurally distribute to the LCL (six types). Two of the connecting tissue membranes surrounding the surface of LCL formed an incomplete sheath structure, and a shutting “gap” was observed between the two membranes. Fine peripheral nervous branches were also observed in the two of the membranes. On the other hand, three types of nerve endings in the LCL (Type Ι/Ruffini mechanoreceptor; Type ΙΙΙ/Golgi mechanoreceptor; Type ΙV/free nerve ending) were observed, and their presence was consistent with the ankle joint of humans. Therefore, the innervation of the two membranes (to form the shutting gap) in the surface of LCL may be associated with an indistinct pain when the knee joint is damaged.
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Abbreviations
- Cr:
-
Cranial
- CB:
-
Caput breve of biceps femoris
- CF:
-
Caput of fibula
- CFN:
-
Common fibular nerve
- CFP:
-
N cutaneous femoris posterior
- CL:
-
Caput longum of biceps femoris
- EM:
-
Epicondylus medialis
- IS:
-
N ischiadicus
- L:
-
Lateral
- LCL:
-
Ligamentum collateral lateral
- N:
-
Nerve branch
- PM:
-
Profundum membrane on the surface of LCL
- SM:
-
Superior membrane on the surface of LCL
- TBN:
-
N tibialis
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Acknowledgments
We thank Dr. Y. Aizawa, and Mr. S. Takahashi (Iwate Medical University) for their technical advice. This work was supported by the Grant-in-Aid for Strategic Medical Science Research Center from the Ministry of Education, Culture, Sports, Science and Technology of Japan (2009–2013), and supported financially by the Advanced Medical Science Center of Iwate Medical University.
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Yan, J., Sasaki, W. & Hitomi, J. Anatomical study of the lateral collateral ligament and its circumference structures in the human knee joint. Surg Radiol Anat 32, 99–106 (2010). https://doi.org/10.1007/s00276-009-0547-2
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DOI: https://doi.org/10.1007/s00276-009-0547-2