Astanga Hrudaya
कूर्परं जानुवत्कौण्यं तयोर्विटपवत्पुनः। कक्षाक्षमध्ये कक्षाधृक् कुणित्वं तत्र जायते॥९॥
Kurpara (in upper limb/arm) is similar to janu (in the lower limb), injury to these causes distortion of the arm. Just like in vitapa, in between the axilla and collar bone is kaksadhra, its injury also causes distortion of arm.
english translation
kUrparaM jAnuvatkauNyaM tayorviTapavatpunaH। kakSAkSamadhye kakSAdhRk kuNitvaM tatra jAyate॥9॥
hk transliteration by Sanscript