photo concept pain in popliteal fossa or the back of the knee, knee joints or ligaments, cruciate for example. man standing with h

anatomy area arm arthritis back background blue body cause concept cruciate damage diagnosis diseases fibular fossa hand hough human injury jeans joint knee kneepit leg ligament located lymph man muscle nerve neurology node over pain person photo popliteal problem sign sprain standing symptom tibial trauma traumatology vein white woman young