-udes

DEFINITION of -udes

The suffix -udes derives from the Latin 3rd-declension noun pattern where the nominative singular ends in -udo and the genitive stem ends in -udinis — a productive Latin suffix used to form abstract nouns expressing a quality, condition, or physical property. In classical Latin anatomy, this pattern yielded terms like incudo/incudes (anvil-shaped), latitudo/latitudines (breadth), and longitudo/longitudines (length). In clinical medicine, -udes appears most prominently in two contexts: (1) anatomically, as the plural of incus → incudes, the ossicular middle ear bones — directly relevant to ENT and surgical coding; and (2) physiologically, as the plural of measurement terms ending in -tude such as amplitude (the peak-to-peak measurement of waveforms in EEG, ECG, and audiology) and magnitude (the size or extent of a clinical finding or signal). Though less prolific than suffixes like -osis or -itis, -udes is anatomically precise and surgically significant in otolaryngologic practice.

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ETYMOLOGY of -udes

latin -udo Latin abstract noun-forming suffix = quality, state, physical property -udinis Genitive stem of -udo (3rd declension) -udes Nominative plural of -udo nouns PIE root *h₂ew- = to perceive, utilize (related to physical qualities) -tude (English) Borrowed from Latin -tudo via Old French -tudeAnatomical use Standardized by Renaissance anatomists; incus/incudes entrenched in Vesalius-era nomenclature

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RELATED TERMS to -udes

🟡 ENT / Otolaryngology — Anatomical (your specialty — most critical)

Term	Meaning
Incus → Incudes	The anvil; middle of the 3 middle ear ossicles (malleus-incus-stapes)
Ossicular chain	Malleus, incudes (incus), stapes — sound conduction apparatus
Incudostapedial joint	Articulation between the incus and stapes
Incudomalleolar joint	Articulation between incus and malleus
Incudopexy	Surgical stabilization of the incus

🔵 Physiologic Measurement Terms (-tude / -tudes)

Term	Medical Application
Amplitude / Amplitudes	Waveform height in EEG, ECG, ABR (auditory brainstem response), EMG, OAE testing
Magnitude	Size/intensity of physiologic signals, tumors, deformities
Altitude	Elevation-related physiology (altitude sickness, hypoxia)
Latitude	Epidemiologic use (UV exposure, disease prevalence gradients)
Longitude	Geographic epidemiology
Turpitude	Medicolegal/ethics context only

🟠 Related Anatomical Structures (Ossicular Chain — ENT)

Structure	Description
Malleus	First ossicle; attached to tympanic membrane
Incus (→ Incudes)	Second ossicle; the “anvil” linking malleus to stapes
Stapes	Third ossicle; footplate seats in oval window
Tympanic membrane	Vibrates → transfers energy through the ossicular chain
Oval window	Stapes footplate transmits vibration to cochlear fluid

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CODING AND NUANCES

RELEVANT ICD-10 CODES

🟡 Ossicular / Incus-Related — ENT (your specialty)

Code	Description
H74.21	Discontinuity and dislocation of right ear ossicles
H74.22	Discontinuity and dislocation of left ear ossicles
H74.23	Discontinuity and dislocation of ear ossicles, bilateral
H74.20	Discontinuity and dislocation of ear ossicles, unspecified ear
H74.311	Ankylosis of ear ossicles, right ear
H74.312	Ankylosis of ear ossicles, left ear
H74.313	Ankylosis of ear ossicles, bilateral
H74.319	Ankylosis of ear ossicles, unspecified ear
H74.321	Partial loss of ear ossicles, right ear
H74.322	Partial loss of ear ossicles, left ear
H74.329	Partial loss of ear ossicles, unspecified ear
H74.391	Other acquired abnormalities of right ear ossicles
H74.393	Other acquired abnormalities of ear ossicles, bilateral
H74.399	Other acquired abnormalities of ear ossicles, unspecified ear
Q16.3	Congenital malformation of ear ossicles

🟡 Otosclerosis (Stapes/Incus Fixation) — ENT

Code	Description
H80.21	Cochlear otosclerosis, right ear
H80.23	Cochlear otosclerosis, bilateral
H80.81	Other otosclerosis, right ear
H80.82	Other otosclerosis, left ear
H80.83	Other otosclerosis, bilateral
H80.91	Unspecified otosclerosis, right ear
H80.93	Unspecified otosclerosis, bilateral

🟡 Conductive Hearing Loss (Sequela of Incus Pathology) — ENT

Code	Description
H90.0	Conductive hearing loss, bilateral
H90.11	Conductive hearing loss, unilateral, right ear, unrestricted contralateral
H90.12	Conductive hearing loss, unilateral, left ear, unrestricted contralateral
H90.A11	Conductive hearing loss, unilateral, right ear, restricted contralateral
H90.A12	Conductive hearing loss, unilateral, left ear, restricted contralateral
H90.2	Conductive hearing loss, unspecified

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RELEVANT CPT CODES

Ossicular Chain Reconstruction / Incus Surgery

Code	Description
69631	Tympanoplasty without mastoidectomy, with ossicular chain reconstruction
69632	Tympanoplasty without mastoidectomy, with ossicular chain reconstruction and synthetic prosthesis (incl. prosthetic TORP/PORP)
69633	Tympanoplasty without mastoidectomy, with ossicular chain reconstruction and homograft
69636	Tympanoplasty with antrotomy/mastoidotomy and ossicular chain reconstruction
69637	Tympanoplasty with antrotomy/mastoidotomy, ossicular chain reconstruction and synthetic prosthesis
69641	Tympanoplasty with mastoidectomy; without ossicular chain reconstruction
69642	Tympanoplasty with mastoidectomy; with ossicular chain reconstruction
69643	Tympanoplasty with mastoidectomy and TORP
69644	Tympanoplasty with mastoidectomy and PORP
69645	Tympanoplasty with radical or complete mastoidectomy
69646	Tympanoplasty with radical mastoidectomy and ossicular chain reconstruction
69660	Stapedectomy or stapedotomy
69661	Stapedectomy or stapedotomy with reestablishment of ossicular continuity
69662	Revision of stapedectomy or stapedotomy

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Coder’s Note: The incus (plural: incudes) is the middle ear ossicle most commonly disrupted in traumatic ossicular discontinuity, chronic otitis media, and cholesteatoma — all high-frequency ENT inpatient diagnoses. When coding ossicular chain reconstruction, the distinction between TORP (total ossicular replacement prosthesis — CPT 69643/69644) and PORP (partial ossicular replacement — retains incus stump) is surgically and CPT-code-specific, so always confirm the operative report. For otosclerosis, stapes fixation is the classic presentation, but incus ankylosis also occurs — check H80.x vs. H74.31x accordingly. On the measurement side, amplitude is the key term in audiology reports (ABR wave amplitudes, OAE amplitudes) — relevant when coding diagnostic audiology alongside your ENT surgical encounters.

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DERIVATIONS of -udes

TABLE definition AS Definition 
WHERE length(filter(roots, (word) => econtains([[]].roots, word))) > 0 AND file.name !=[[]].file.name
SORT file.name ASC

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Query

TABLE definition AS Definition
FROM #medroot
WHERE length(filter(definition, (word) => econtains([[]].definition, word))) > 0 AND file.name != [[]].file.name

Med roots dictionary Appendix A Prefixes Appendix B Combining Forms Appendix C Suffixes Appendix D Suffix forms