(Continuing my Season 4 re-visit.)
There is something in The Good News about people getting injured. Specifically, people who want control over their lives and self-inflicted injury, those who are always getting help from Mr Personal Injury Lawyer or any lawyer to get a solution.
Consider: Joan has had two abortions, and she’s worried that they may have damaged (injured) her. Those abortions were choices Joan made. Later, she slices her own hand. Joan is struggling to get control over her life, she wants to know when her future starts, she wants things to go according to plan. Instead, she’s injured.
Parallel that to Anna, who has broken her own leg. She either slipped making eggs (her version) or while drunk (Don’s teasing suggestion). Anna is struggling against her sister, struggling for independence; she doesn’t want to be treated like an invalid. Yet Anna has cancer (another injury) and Pat (her sister) is robbing her of choice by keeping the information from her.