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.
Category Medical Specialty
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.
Jørgen Reimers
Jørgen Reimers (1931-2008), Danish paediatric orthopaedic surgeon. Reimers migration percentage for surveillance of hip displacement in cerebral palsy.
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.
Dietrich Tönnis
Dietrich Tönnis (1927-2010), German paediatric orthopaedic surgeon known for the Tönnis angle, Tönnis classification, triple pelvic osteotomy and work on hip dysplasia.
Perkins line
Perkins line is the vertical pelvic reference used with Hilgenreiner line in DDH assessment. Review its definition, 1928 origin, history and eponymythology
George Perkins
George Perkins (1892-1979) was an English orthopaedic surgeon known for Perkins line, Perkins traction, functional fracture treatment and British orthopaedic leadership.
Hilgenreiner line
Hilgenreiner line is the horizontal pelvic reference line used in paediatric hip radiographs. Review its use in DDH, history, Perkin line relationship and eponymythology.
Heinrich Hilgenreiner
Heinrich Hilgenreiner (1870–1953) was a German-Bohemian surgeon who pioneered early diagnosis and treatment of developmental hip dysplasia and described Hilgenreiner line.