Musar for Rosh Hashanah 20:8
ור"א מ"ט דכתיב בראשון באחד לחדש מדאכתי יום אחד הוא דעייל בחדש וקא קרי ליה חדש ש"מ יום אחד בחדש חשוב חדש ומדיום אחד בחדש חשוב חדש ל' יום בשנה חשובין שנה וחדש למנוייו ושנה למנוייה
R'Meir reasoned: Seeing that the year was only one day old and it is still called a year, we can conclude that one day in a year is reckoned as a year. What says the other to this? - [He says that] if it were written, 'In the s hundred and first year', then it would be as you say.
Shenei Luchot HaBerit
What all this has to do with Samael injuring the כף ירך יעקב, the thigh joint of Jacob, is simple. Our sages say on 32,26: וירא כי לא יוכל לו, ויגע בכף ירכו ותקע כך ירך יעקב, that the thigh joint of Jacob refers to the later descendants who experienced the harsh decrees by the various nations who were their hosts in exile. When the Hasmoneans overcame the Greeks, they reversed this injury, i.e. the כף became a פך a cruse of oil. What had been a vulnerable part of Jacob's ירך now became the solid basis of the candelabra, ירך מנורה.
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