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Muscles that Move the Leg

Muscles that Move the Leg

The movement of the legs is facilitated by numerous muscles located within the anterior, medial, and posterior compartments of the thigh.
Anterior Compartment
The quadriceps femoris, the most visible muscle of the anterior compartment, is integral for leg extension and thigh flexion. It is formed by merging four distinct muscles — the vastus lateralis, vastus medialis, vastus intermedius, and rectus femoris. The quadriceps tendon, a shared tendon of the four quadriceps muscles, is affixed to...

Bones of the Lower Limb: Femur and Patella

Bones of the Lower Limb: Femur and Patella

The femur is the body's longest and strongest bone spanning the thigh region. Its head articulates with the acetabulum of the hip bone to form the hip joint. A minor indentation on the medial side of the femoral head, called the fovea capitis, serves as the site of attachment for the ligament of the head of the femur. This weak ligament spans the femur and acetabulum and supports the hip joint. The narrowed region below the head is the neck of the femur. The inclination angle between the neck...

Knee Joint

Knee Joint

The knee joint is the most complicated joint in the body. It consists of three articulations– two tibiofemoral and one patellofemoral. As is characteristic of synovial joints, the knee joint has a thin articular capsule that partially surrounds this joint cavity. Additionally, several ligaments, muscles, and cartilaginous structures support the movement of the knee.
A total of seven ligaments support the knee joint. The patellar ligament, which is also attached to the quadriceps femoris group...

Ankle Joint

Ankle Joint

The ankle is formed by the talocrural joint (crural = leg). It consists of the articulations between the talus bone of the foot and the distal ends of the tibia and fibula of the leg. The superior aspect of the talus bone is square-shaped and has three areas of articulation. The top of the talus articulates with the inferior tibia. This is the portion of the ankle joint that carries the body weight between the leg and foot. The sides of the talus are firmly held in position by the articulations...

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Related Experiment Video

Updated: May 16, 2026

Anterior Cruciate Ligament Transection and Synovial Fluid Lavage in a Rodent Model to Study Joint Inflammation and Posttraumatic Osteoarthritis

Anterior Cruciate Ligament Transection and Synovial Fluid Lavage in a Rodent Model to Study Joint Inflammation and Posttraumatic Osteoarthritis

Published on: September 2, 2025

Atraumatic quadriceps tendon tear associated with calcific tendonitis.

Simon G F Abram¹, Akash D Sharma, Chinnakonda Arvind

¹Department of Orthopaedics, Royal Berkshire NHS Foundation Trust, Reading, UK. simon.abram@doctors.org.uk

BMJ Case Reports

|November 29, 2012

Summary

Calcific tendonitis of the quadriceps tendon, though rare, can lead to tears mimicking ruptures. This condition requires consideration in acute knee extensor mechanism injuries.

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Treatment Protocol for Rotator Cuff Calcific Tendinitis Using a Single-Crystal Piezoelectric Focused Shock Wave Source

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Published on: December 23, 2022

Area of Science:

Orthopedics
Sports Medicine
Musculoskeletal Radiology

Background:

Calcific tendonitis is a condition characterized by calcium deposits in tendons.
Quadriceps tendon involvement is uncommon.
Tendon tears often result from acute trauma or degeneration.

Observation:

A patient presented with symptoms strongly suggestive of a quadriceps tendon rupture.
Imaging and clinical evaluation revealed an associated calcific tendonitis of the quadriceps tendon.
This represents the first reported case of a quadriceps tendon tear linked to calcific tendonitis.

Findings:

Calcific tendonitis of the quadriceps tendon can predispose the tendon to tearing.
The presentation can be indistinguishable from a primary tendon rupture.
This association highlights a potential, previously unrecognized complication of calcific tendonitis.

Implications:

Clinicians should consider calcific tendonitis in the differential diagnosis of acute quadriceps tendon injuries.
Early recognition may influence treatment strategies and patient outcomes.
Further research is warranted to understand the biomechanical link between calcific tendonitis and tendon tears.