What does ballottement mean?
Ballottement is a clinical examination technique in which a body structure — most often a foetus inside the uterus, or a bone or organ surrounded by excess fluid — is given a sharp push by the examiner's fingers, causing it to float away and then rebound into contact. In obstetrics it helps confirm pregnancy and identify which part of the foetus is presenting, while in general diagnosis it is classically applied to the kneecap, which can be made to bob within a swollen, fluid-filled joint. The word entered English from nineteenth-century French medical writing, deriving from a verb meaning to toss or bounce, which explains its name: the examined body part behaves like a ball being nudged through water. Entirely technical, ballottement appears almost exclusively in medical textbooks, examination manuals, and clinical notes rather than ordinary conversation.
nounA medical examination technique in which an organ or mass, especially a foetus within the uterus or fluid-filled structures such as the knee joint, is pushed by a sudden tap so that it moves away and then floats back against the examiner's fingers. It is used chiefly in obstetrics and physical diagnosis.
- In obstetrics, a manoeuvre in which the examiner pushes against the foetus through the abdominal wall or vagina so that it drifts away and rebounds, confirming its presence, position, or presenting part.
- In general physical diagnosis, a technique of sharply tapping a suspected mass or effusion (for example, swelling around the patella) to detect whether it floats freely in surrounding fluid.
"At twenty-eight weeks the midwife confirmed the presenting part by gentle ballottement of the foetal head."
"During the antenatal examination, the obstetrician performed external ballottement to confirm which part of the foetus was presenting."
"Marked suprapatellar effusion allowed easy ballottement of the patella when pressed firmly."
The word for a pregnancy exam technique comes from the same bouncing-ball family as 'ballot' and even 'ballet'.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of ballottement
Ballottement was adopted into English medicine from French during the nineteenth century, when French clinicians codified many obstetric manoeuvres. It derives from the French verb ballotter, meaning to toss or shake something back and forth, itself rooted in the Romance family of words built on 'ball' — the same lineage behind ballot, the small ball originally used in voting, and ultimately behind ballet via the Italian ballare. Its literal sense of 'tossing' maps directly onto the physical action the term describes.
How ballottement is actually used
Strictly technical vocabulary confined to medicine, particularly obstetrics and orthopaedic examination; it would sound out of place in everyday speech. Distinguished in obstetric texts as 'external' (through the abdominal wall) or 'internal' (transvaginal).
Easily confused with ballottement
Ballot refers to voting or the paper used to vote, whereas ballottement is a clinical palpation technique for detecting a floating organ or foetus.