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Occurrence of free nerve endings in the soft tissue of the knee joint

A histologic investigation

Sports Traumatology Research Institute, Magglingen

Edi Stauffer, MD

Institute of Forensic Medicine, Bern

Niklaus F. Friederich, MD

Department of Orthopaedic Surgery, Bruderholz, Switzerland

We present a comprehensive histologic study of neu rologic structures in 18 static and dynamic knee struc tures of 8 cadaveric knees. Qualitative and quantitative measurements of the incidence of free nerve endings in the structures were recorded. The highest amounts of afferent nerve fibers type IVa were found in the retinacula, the patellar ligament, the pes anserinus, and in the ligaments of Wrisberg and Humphry; the lowest amount was found in the anterior cruciate ligament. There is a positive correlation between the number of mechanoreceptors per standardized area unit and the clinical presentation of certain knee disorders.

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