Hip and pelvic lines and arcs
Hip and pelvic radiographic lines, arcs, angles and eponyms used to assess developmental dysplasia, SCFE, mature hip morphology and alignment.
Category Radiology
Köhler line
Köhler line is the ilioischial line on AP pelvis X-ray, to assess coxa profunda and protrusio acetabuli. History and interpretation.
Köhler disease
Köhler disease is a self-limiting osteochondrosis of the tarsal navicular in children. Definition, imaging, management, prognosis, history and eponymythology.
CT Case 108
A 60 year old male is brought in by ambulance following a head on collision at moderate speed in a car. CT c-spine is performed
CT Case 107
A 60 year old male is brought in by ambulance following a head on collision at moderate speed in a car. CT c-spine is performed
CT Case 106
A 70 year old woman presents with 12 hours of lower abdominal pain and one episode of haematochaezia at home. CT mesenteric angiogram is performed
Centre-edge angle of Wiberg
Centre-edge angle of Wiberg measures lateral acetabular coverage. Review the original 1939 method, later modifications, normal values and definition drift.
William Henry Trethowan
William Henry Trethowan (1882-1934), British orthopaedic surgeon known for fracture surgery, bone grafting, foot surgery and the historical Trethowan sign
Trethowan sign
Trethowan sign is a historical SCFE radiographic sign linked to William Henry Trethowan. Review its uncertain origin, evolving definition and relation to Klein line.
Reimers migration percentage
Reimers migration percentage quantifies lateral hip displacement in children. Review the original 1980 method, Perkins line, modern variants and clinical use.
Armin Klein
Armin Klein (1892–1954), American orthopaedic surgeon known for Klein line and work on slipped capital femoral epiphysis, scoliosis and paediatric orthopaedics.
Klein line
Klein line is an AP hip radiographic sign used in suspected SCFE. Review the original description, modern interpretation, limitations and modified Klein line.