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Related Concept Videos

Trigonometric Equations01:30

Trigonometric Equations

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Trigonometric equations involve one or more trigonometric functions and arise frequently in mathematical modeling. These equations may be either identities, which are valid for all values of the variable, or conditional equations, which hold true only for specific values. The process of solving trigonometric equations typically involves both algebraic techniques and the use of fundamental properties of trigonometric functions.Some trigonometric equations resemble standard algebraic forms and...
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Trigonometric Identities I01:27

Trigonometric Identities I

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Trigonometric identities are equations that relate trigonometric functions and hold for all angles within their domains. A fundamental identity among these is the Pythagorean identity, which arises directly from the geometry of the unit circle. For any angle θ, a point on the unit circle has coordinates (cos⁡ θ, sin ⁡θ), and since the radius of the circle is one, the Pythagorean Theorem gives:This identity serves as the basis for deriving additional identities. Dividing the Pythagorean...
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Trigonometry of Right Triangles01:29

Trigonometry of Right Triangles

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In a right triangle, trigonometric functions establish specific ratios that describe the relationship between the lengths of the triangle's sides and its acute angles. These relationships are foundational in understanding the structure of right-angled geometry. The sine function quantifies the proportion of the side opposite a given angle compared to the triangle's hypotenuse. In contrast, the cosine function expresses how the side adjacent to the angle relates to the hypotenuse in terms of...
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Trigonometric Identities III01:27

Trigonometric Identities III

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Cofunction identities are a key concept in trigonometry. They describe how trigonometric functions relate when their input angles are complementary — meaning the angles add up to 90°. On the unit circle, every angle θ— measured counterclockwise from the positive x-axis — corresponds to a point with coordinates (cos⁡ θ, sin ⁡θ). These values represent the horizontal and vertical components of the terminal side of the angle.If the same point on the unit circle is instead described...
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Trigonometric Functions of Real Numbers01:30

Trigonometric Functions of Real Numbers

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The unit circle—a circle with a radius of one, centered at the origin of the coordinate plane—serves as the foundational framework for defining trigonometric functions. In this context, arc length refers to the distance measured along the circumference of the circle between two points, and it provides a way to represent real numbers geometrically. Each real number t corresponds to an arc length measured counterclockwise from the positive x-axis around the circle. The coordinates of a point...
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Trigonometric Identities II01:28

Trigonometric Identities II

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Double-angle and half-angle trigonometric identities are derived from the fundamental sum and difference formulas and serve as essential tools for simplifying expressions, solving equations, and evaluating integrals. These identities reduce the complexity of trigonometric functions by relating functions of a multiple or fractional angle to functions of a single angle. Their applications extend across mathematics, physics, and engineering, particularly in Fourier analysis, wave mechanics, and...
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Os Trigonum Syndrome.

Jeffrey E McAlister1, Usman Urooj2

  • 1Phoenix Foot and Ankle Institute, 7301 East 2nd Street, Suite 206, Scottsdale, AZ 85251, USA.

Clinics in Podiatric Medicine and Surgery
|March 22, 2021
PubMed
Summary
This summary is machine-generated.

Os trigonum syndrome involves an enlarged ossicle in the ankle, often causing posterolateral pain with repetitive plantarflexion. Treatment options range from conservative care to surgical excision, including endoscopic and open methods.

Keywords:
Flexor hallucis longus synovitisOs trigonumPosterior ankle impingement syndromeSteida process

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Area of Science:

  • Orthopedic Surgery
  • Sports Medicine
  • Anatomy

Background:

  • Os trigonum is an accessory ossicle commonly found in the foot and ankle.
  • Repetitive ankle plantarflexion can lead to symptomatic enlargement of the os trigonum.
  • Posterolateral ankle pain is a frequent symptom, often involving the flexor hallucis longus tendon.

Purpose of the Study:

  • To provide a comprehensive overview of os trigonum syndrome.
  • To discuss associated complications and surgical techniques.
  • To present the authors' preferred management protocol.

Main Methods:

  • Literature review of os trigonum syndrome.
  • Description of conservative management strategies.
  • Detailed explanation of surgical excision techniques (open and endoscopic).

Main Results:

  • Os trigonum syndrome typically presents with posterolateral ankle pain.
  • The flexor hallucis longus tendon's anatomy contributes to pain during ankle motion.
  • Both conservative and surgical interventions are established treatment modalities.

Conclusions:

  • Os trigonum syndrome requires careful diagnosis and management.
  • Surgical excision offers a definitive treatment option for persistent symptoms.
  • Understanding the anatomy is crucial for effective treatment of os trigonum syndrome.