Orthopedic Trauma Glossary
100 terms total — 24 showing — Last updated 15 Sep 2026
Zone of polarizing activity ZPA
Embryonic signaling center controlling digit pattern formation during limb development.
polytrauma
Multiple traumatic injuries affecting several body systems or anatomical regions simultaneously.
Primary bone healing
Direct bone healing that occurs when fracture fragments are in close contact with rigid fixation and minimal gap.
provisional fixation
Temporary stabilization of fracture fragments during surgery to maintain reduction while applying definitive fixation.
provisional K-wire
Temporary Kirschner wire placed to maintain fracture reduction during definitive fixation procedures.
Provisional reduction
Temporary fracture alignment achieved before definitive fixation, often maintained with clamps or temporary pins.
pseudarthrosis
Formation of a false joint at the site of an ununited fracture.
reduction loss
Secondary displacement of a fracture after initial successful reduction and fixation.
Reduction maneuver
A specific technique or series of movements used to realign displaced bone fragments or dislocated joints.
Retrograde nailing
An intramedullary fixation technique where the nail is inserted from the distal end of the bone.
revision ORIF
A secondary surgical procedure to revise or replace previous internal fixation hardware.
Rotational malalignment
Improper rotational positioning of bone fragments following fracture, leading to functional impairment.
Salter-Harris classification
System for categorizing pediatric physeal (growth plate) injuries based on fracture pattern.
screw angulation
The angle at which a screw is inserted relative to the bone surface or fracture plane.
Screw backout
Progressive loosening and migration of orthopedic screws from their original position in bone.
Screw pullout
Mechanical failure where a screw loses its hold in bone, often due to poor bone quality or excessive loading.
screw toggle
Loosening of a screw within bone, indicating loss of fixation integrity.
stress riser
A point of stress concentration in bone or implant that increases the risk of failure at that location.
Subtrochanteric fracture
A femoral fracture occurring in the region below the lesser trochanter, typically within 5cm of this landmark.
Syndesmosis screw
A large-diameter screw used to temporarily stabilize the tibiofibular syndesmosis after ankle injury.
syndesmotic injury
Injury to the fibrous ligaments connecting the tibia and fibula, affecting ankle stability.
Tension band wiring
A fixation technique that converts tensile forces into compressive forces across a fracture site.
Traction apophysitis
Inflammation of bone growth centers due to repetitive pulling forces from attached tendons or muscles.
unicortical screw
A screw that engages only one cortex of bone, typically used when bicortical purchase is not feasible or necessary.
valgus angulation
Deformity where the distal portion of a limb is angled away from the midline of the body.