What is the angle of Gissane?
Interpretation. The normal Gissane angle is usually between 120° and 145° 1. There is a relatively wide variation in the size of the angle between individuals but there is relatively little difference between the left and right feet of individual patients 2.
What is Bohler angle?
The Böhler angle is the angle on a lateral foot radiograph between a line joining the highest point of the anterior process of the calcaneus and the highest point of the posterior articular facet, and a line joining the highest point of the posterior articular facet with the highest point of the calcaneal tuberosity 1.
How do you measure a Bohler angle?
Böhler’s angle can be measured with the use of two intersecting lines: one drawn from anterior process of the calcaneus to the highest part of posterior articular surface and a second drawn from the same point of posterior articular surface to the most superior point of tuberosity.
What is crucial angle?
Critical Angle of Gissane. Gissane’s angle is also known as the crucial or critical angle and can be used to help determine the presence of a calcaneus fracture on a radiograph. The normal range is 130-145 degrees.
What is Lover’s fracture?
Lover’s fracture, also known as Don Juan fracture or Casanova fracture is a type of calcaneal fracture. They are fractures of the calcaneal body and may be intra- or extra-articular.
What is Sinus Tarsi approach?
Sinus tarsi approach provides good exposure to the subtalar joint. Open reduction and internal fixation of calcaneus fractures through a sinus tarsi approach allows adequate reduction with low risk of wound-healing complications.
Why is it called Lover’s fracture?
The name “lover’s fracture” is derived from the fact that a suitor may jump from great heights while trying to escape from the lover’s spouse 2. There is an important association between lover’s fractures and burst fractures of the lumbar spine.
What is calcaneus fracture?
A fracture of the calcaneus, or heel bone, can be a painful and disabling injury. This type of fracture commonly occurs during a high-energy event—such as a car crash or a fall from a ladder—when the heel is crushed under the weight of the body. When this occurs, the heel can widen, shorten, and become deformed.
What happens at Brewster’s angle?
Brewster’s angle (also known as the polarization angle) is an angle of incidence at which light with a particular polarization is perfectly transmitted through a transparent dielectric surface, with no reflection.
What is the relation between refractive index and critical angle?
The ratio of velocities of a light ray in the air to the given medium is a refractive index. Thus, the relation between the critical angle and refractive index can be established as the Critical angle is inversely proportional to the refractive index.
What is a Galeazzi fracture?
The Galeazzi fracture-dislocation is an injury pattern involving isolated fractures of the junction of the distal third and middle third of the radius with associated subluxation or dislocation of the distal radioulnar joint (DRUJ); the injury disrupts the forearm axis joint.
Is the sinus tarsi approach safer than extended lateral approach for calcaneal fractures?
From our meta-analysis, a minimally invasive sinus tarsi approach for the fixation of displaced intra-articular calcaneal fractures is associated with a lower rate of complications and a faster operation time when compared to ORIF via an extensile lateral approach.
What is a Gissane angle?
Gissane angle, also known as the ” critical angle “, is an angular measurement made directly inferior to the lateral process of the talus . It is formed by the downward and upward slopes of the calcaneal superior surface. It is better seen on a lateral plain film of the calcaneus and hindfoot. Its normal value is usually between 120° and 145°.
How reliable is Boehler’s angle and critical angle for calcaneus fractures?
Boehler’s angle and the critical angle of Gissane are of limited use in diagnosing calcaneus fractures in the ED BA is somewhat helpful and the CAG is not useful in diagnosing calcaneus fractures in the ED. Interrater reliability for BA is excellent, but for the CAG, it is poor.
Is the critical angle of Gissane useful in diagnosing calcaneus fractures?
Boehler’s angle and the critical angle of Gissane are of limited use in diagnosing calcaneus fractures in the ED BA is somewhat helpful and the CAG is not useful in diagnosing calcaneus fractures in the ED.