The Lenticular.

Area of Science:

• Paleopathology
• Surgical History
• Archaeology

Background:

• The lenticular, an ancient cranial bone cutting tool, was first illustrated in the 16th century.
• Renaissance illustrations depict a lenticular shape potentially ill-suited for its intended function.
• Archaeological findings suggest a more effective cranial bone cutting instrument design.

Purpose of the Study:

• To evaluate the efficacy of the Roman lenticular versus the Renaissance lenticular for cutting cranial bone.
• To compare the functional suitability of two distinct lenticular instrument designs.

Main Methods:

• Replicas of both Roman and Renaissance lenticular instruments were created.
• Experimental trepanation was performed on sheep crania using the instrument replicas.
• A literature review analyzed the historical application of these instruments.

Main Results:

• The Roman lenticular replica successfully cut cranial bone.
• The Renaissance lenticular replica failed to incise bone, instead detaching the dura mater.
• Historical records indicate lenticular use for bone cutting until the 13th century, with later instruments used for smoothing.

Conclusions:

• Renaissance lenticulars were likely used for post-trepanation bone smoothing and spicule removal, not primary bone cutting.
• Critical analysis of historical medical illustrations is crucial for accurate understanding of surgical practices.