What is hegemann disease?
A complete avascular necrosis could develop after traumatic events. Alternatively Hegemann’s disease is a benign, self-limiting stage of fishtail deformity after unrecognised injury or (repetitive) micro-trauma. Hegemann’s disease is characterised by irregularity of the trochlea and sclerosis.
What is fish tail deformity?
Fishtail deformity of the elbow is characterised by a contour abnormality of the distal humerus, which develops when the lateral trochlear ossification centres fails to develop or resorbs. It is an uncommon complication usually following a distal humeral fracture in childhood.
What is the Trochlea of the humerus?
In the human arm, the humeral trochlea is the medial portion of the articular surface of the elbow joint which articulates with the trochlear notch on the ulna in the forearm.
What is Baumann angle?
Baumann angle, also known as the humeral-capitellar angle, is used for the evaluation of the displacement of pediatric supracondylar humeral fractures. It is measured on a frontal radiograph, with elbow in extension.
What is carrying angle of elbow?
When your arms are held out at your sides and your palms are facing forward, your forearm and hands should normally be about 5 to 15 degrees away from your body. This is the normal “carrying angle” of the elbow. This angle allows your forearms to clear your hips when you swing your arms, such as during walking.
Where is the trochlea located?
What two bones have a trochlea?
The trochlea is the roughly hourglass-shaped feature on the distal end of the humerus. It articulates with the trochlear notch of the ulna.
Where is capitellum?
The capitellum, also referred to as the capitulum, is the lateral part of the humeral condyle that articulates with the radial head.
How is Hegemann’s disease diagnosed?
Usually, the term ‘Hegemann’s disease’ is used for spontaneous or idiopathic osteonecrosis of the humeral trochlea. You can question if a disease can be called Hegemann’s disease if it is not of idiopathic origin. In all reports, standard radiographs were used for diagnosing Hegemann’s disease and fishtail deformity.
What is the difference between Panner’s Disease and Hegemann’s disease?
Hegemann’s disease (aseptic necrosis of the humeral trochlea) is rarer condition than Panner’s disease which is aseptic necrosis of the humeral capitellum. The difference in period of appearance of the ossification center is probably one reason for a lower incidence of Hegemann’s disease compared to Panner’s disease.
Can Hegemann’s disease be repaired?
This condition has since been known also as Hegemann’s disease. Under observation or by restriction of sports activity this disease is considered to be repaired spontaneously with no sequelae, following the same course as Panner’s diseases and a similar course as Perthes’ disease.
What is aseptic necrosis of trochlea (Hegemann’s disease)?
Aseptic necrosis of trochlea (Hegemann’s disease) is very rare. The diagnosis was done only by x-ray. At early stage it is sometimes difficult by X-rays alone to distinguish aseptic necrosis from other conditions, like as osteochondritis dissecanse or normal growth ossification center with fragmentation.