In 1894 he co-founded the journal Monatsschrift für Geburtshilfe und Gynäkologie.
In 1882 he introduced the practice of sutural closure of the uterus following Caesarean section operations.
The previous autumn, Ferdinand Adolf Kehrer (1837-1914) performed the first lower segment Caesarean section in Europe.
Sänger's contribution preserved the mother's uterus and helped reduce the chance of infection.
Silver sutures had been introduced into medicine by the American gynecologist James Marion Sims (1813-1883).