Pes Planus
Pronunciation: PEEZ PLAY-nus
A structural or functional condition characterised by a reduced or absent medial longitudinal arch, commonly referred to as flat foot.
Full Definition
Pes planus describes a foot in which the medial longitudinal arch is diminished or absent, either due to structural bony changes (rigid pes planus) or flexible ligamentous laxity (flexible pes planus). The distinction between rigid and flexible forms is clinically and documentarily important, as it drives orthotic prescription decisions. Editors must use the Latin terminology in formal clinical and insurance records rather than lay terms such as 'flat foot' or 'fallen arches.' The ICD-10-CM code set includes specific codes for acquired versus congenital pes planus, and editors should verify alignment between the diagnostic narrative and the coded diagnosis.
Usage
Usage note: Distinguish between rigid and flexible pes planus in clinical records. Italicise as a Latin term only if house style requires; many medical style guides treat it as a naturalised term.
In Context
- "The referral diagnosis of pes planus was supported by the clinical finding of bilateral arch collapse on weight-bearing." — Referral letter
- "Use 'pes planus' in formal diagnostic documentation; 'flat foot' may be used in patient-facing materials." — Editorial style note