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.
load transfer
The mechanism by which mechanical forces are transmitted from bone to implant or between bone segments.
load-bearing axis
The anatomical line through a bone along which mechanical forces are transmitted during weight-bearing activities.
load-sharing device
An implant that bears part of the mechanical load alongside the bone during healing.
Locking compression plate
A fixation device that combines conventional compression plating with locked screw technology for enhanced stability.
malunion
Fracture healing in an anatomically incorrect position resulting in deformity or functional impairment.
Mechanical axis deviation
Abnormal alignment of the weight-bearing axis of the lower extremity from the normal hip-to-ankle line.
Metaphyseal comminution
Fracture fragmentation occurring in the metaphyseal region of long bones, between the shaft and joint surface.
Metaphyseal corner fracture
Small avulsion fracture at the metaphyseal corner, often associated with non-accidental trauma in infants.
metaphyseal spike
A sharp fragment of bone extending from the metaphyseal region, often seen in comminuted fractures.
MIPO
Minimally Invasive Plate Osteosynthesis: surgical technique using small incisions to minimize soft tissue damage.
Morel-Lavallée lesion
Closed degloving injury causing separation of subcutaneous tissue from underlying fascia with fluid collection.
nonunion
Failure of bone fracture to heal within the expected timeframe despite adequate treatment.
open reduction and internal fixation
Surgical procedure involving open exposure of a fracture site followed by placement of hardware to maintain bone alignme...
ORIF
Open Reduction and Internal Fixation: surgical treatment involving exposure of the fracture and stabilization with impla...
osteosynthesis
Surgical fixation of bone fractures using internal devices to promote healing.
OTA
Orthopaedic Trauma Association - the organization that developed the comprehensive alphanumeric fracture classification...
pathological fracture
Fracture occurring through abnormal or diseased bone with minimal or no trauma.
Percutaneous pinning
A minimally invasive fixation technique using pins or wires inserted through the skin without open surgical exposure.
periarticular fracture
Fracture occurring near but not necessarily involving a joint surface.
periosteal stripping
Surgical removal or traumatic loss of the periosteum, the tissue layer that provides blood supply to underlying bone.
Physiologic genu valgum
Normal developmental knee alignment variation in children, typically resolving by age 6-8 years.
pilon fracture
A high-energy fracture of the distal tibia involving the weight-bearing articular surface of the ankle.
plate contouring
The process of shaping an orthopedic plate to match the anatomical contours of the bone.
Plate osteosynthesis
The surgical fixation of fractures using metal plates and screws to restore bone continuity and stability.