Sayyiduna Adi bin Hatim (may Allah be pleased with him) asked about game killed by the broad side of a spear, and he (peace and blessings be upon him) said: "What the edge of the spear strikes, eat it; and game that is struck by the broad side of the spear is to be regarded as having died from a blow with a blunt object, so do not eat it."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيد والذبائح / 18949