Accident Definition:
The word accident is derived from the Latin verb accidere, signifying "fall upon, befall, happen, chance." In its most commonly accepted meaning, or in its ordinary or popular sense, the word may be defined as meaning: some sudden and unexpected event taking place without expectation, upon the instant, rather than something that continues, progresses or develops; something happening by chance; something unforeseen, unexpected, unusual, extraordinary, or phenomenal, taking place not according to the usual course of things or events, out of the range of ordinary calculations; that which exists or occurs abnormally, or an uncommon occurrence. The word may be employed as denoting a calamity, casualty, catastrophe, disaster, an undesirable or unfortunate happening; any unexpected personal injury resulting from any unlooked for mishap or occurrence; any unpleasant or unfortunate occurrence that causes injury, loss, suffering, or death; some untoward occurrence aside from the usual course of events. An event that takes place without one's foresight or expectation; an undesigned, sudden, and unexpected event.
It's unclear from your post whether there is a real problem with safety (manual handling?) or whether the general culture is poor regarding a robust absence management strategy and/or its application by management. Either way you have to deal with the issues else it will be ongoing.