Around 1267, the Italian surgeon Theodoric of Lucca introduced a revolutionary approach to medical practice that challenged the long-standing orthodoxy of wound management. During this period, the prevailing medical consensus held that the formation of pus, known as laudable pus, was a natural and necessary stage in the healing process. Surgeons often actively encouraged suppuration by applying irritants to wounds, believing this discharge indicated that the body was effectively purging itself of infection.

Theodoric of Lucca fundamentally disagreed with this practice, arguing instead that the presence of pus was a sign of improper healing rather than a requirement for recovery. Drawing upon his observations and clinical experience, he advocated for a far cleaner methodology that prioritised the prevention of infection from the outset. His technique focused on keeping wounds free of foreign matter and applying wine as a cleansing agent to promote primary intention healing, where the edges of a wound are brought together to close without the development of significant inflammation or discharge.

His radical stance placed him at the centre of a significant intellectual and practical debate within medieval surgery. This conflict pitted traditionalists, who adhered to the teachings of ancient authorities like Galen, against those who favoured empirical observation and more hygienic interventions. Theodoric's work highlighted the growing tension between theoretical medical dogma and the practical realities of surgical outcomes, marking a pivotal moment in the history of clinical care.

The core principles of his approach included:

• Rejecting the necessity of pus in the healing process.
• Utilising wine as a topical antiseptic to cleanse wounds.
• Promoting the closure of wounds to prevent external contamination.
• Prioritising cleanliness to facilitate natural recovery.
• Challenging established surgical traditions regarding infection.

Although his methods were not universally adopted during his lifetime, Theodoric of Lucca remains a significant figure in the history of surgery. His insistence on cleaner wound care anticipated later developments in antisepsis and infection control, demonstrating a sophisticated understanding of the relationship between hygiene and patient recovery long before the advent of modern germ theory.