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Related Concept Videos

Somatic Spinal Reflexes01:22

Somatic Spinal Reflexes

Somatic spinal reflexes are rapid, involuntary muscular responses to external stimuli that involve the somatic musculature and the spinal cord.
One of the most well-known somatic spinal reflexes is the stretch reflex, which is activated by the sudden stretching of a muscle. This reflex involves the activation of specialized sensory receptors called muscle spindles, which are located in the muscle tissue and detect changes in the length and speed of muscle contractions. When a muscle is suddenly...
Herniated Intervertebral Disc l: Introduction01:29

Herniated Intervertebral Disc l: Introduction

Intervertebral disc herniation refers to the displacement of the nucleus pulposus (the gel-like inner core of the disc) through a tear or weakened area in the annulus fibrosus (the outer fibrous ring). The displaced disc material extends beyond the normal boundaries of the disc space and may compress or irritate nearby spinal nerve roots or, less commonly, the spinal cord.Etiology and Risk FactorsHerniation commonly results from degeneration, in which aging reduces disc hydration and...
Secondary Spinal Cord Injury llI: Pathophysiology01:25

Secondary Spinal Cord Injury llI: Pathophysiology

Early Ischemia and Ionic ImbalanceWithin minutes of spinal cord injury, a secondary cascade begins, progressing over hours to weeks. Vascular damage reduces blood flow, causing ischemia and mitochondrial dysfunction. ATP depletion leads to ion pump failure, membrane depolarization, sodium influx, potassium efflux, and water accumulation, resulting in cellular swelling. Increased intracellular calcium further disrupts mitochondria and accelerates cellular injury.Excitotoxicity and Neuronal...
Spinal Cord Injury ll: Pathophysiology01:14

Spinal Cord Injury ll: Pathophysiology

Spinal cord injury progresses through two interconnected phases: primary injury and secondary injury.Primary InjuryPrimary injury happens at the moment of trauma and involves immediate mechanical damage to the spinal cord.Compression happens when broken vertebrae, herniated discs, or accumulating blood (such as a hematoma) press directly against the spinal cord, distorting its normal shape and function. In cases of contusion, the cord is bruised by a blunt force (like penetrating injuries or...
Muscles that Move the Leg01:23

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...

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Related Experiment Video

Updated: May 22, 2026

The Fibular Nerve Injury Method: A Reliable Assay to Identify and Test Factors That Repair Neuromuscular Junctions
06:01

The Fibular Nerve Injury Method: A Reliable Assay to Identify and Test Factors That Repair Neuromuscular Junctions

Published on: August 11, 2016

Nerve entrapment after hamstring injury.

Heinz Lohrer1, Tanja Nauck, Moritz A Konerding

  • 1Institute for Sports Medicine Frankfurt am Main, Frankfurt/Main, Germany. lohrer@smi-frankfurt.de

Clinical Journal of Sport Medicine : Official Journal of the Canadian Academy of Sport Medicine
|May 16, 2012
PubMed
Summary

A rare hamstring injury complication involves sciatic nerve entrapment by scar tissue, causing athletic disability. Surgical release of the nerve branch restored the soccer player's full sport capacity.

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Last Updated: May 22, 2026

The Fibular Nerve Injury Method: A Reliable Assay to Identify and Test Factors That Repair Neuromuscular Junctions
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Novel Surgical Rodent Model for Studying Neuroma Pain Treatment Options using Targeted Muscle Reinnervation Through the Saphenous Nerve
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Novel Surgical Rodent Model for Studying Neuroma Pain Treatment Options using Targeted Muscle Reinnervation Through the Saphenous Nerve

Published on: November 14, 2025

Area of Science:

  • Sports Medicine
  • Neurology
  • Orthopedic Surgery

Background:

  • Hamstring injuries frequently cause athletic disability and high reinjury rates.
  • Persistent pain and limited performance after hamstring injuries can be debilitating for athletes.

Observation:

  • A case report details a soccer player with persistent disability following a minor hamstring injury.
  • A previously undescribed lesion was identified: scar tissue compromising a motor branch of the sciatic nerve supplying the biceps femoris long head.

Findings:

  • Surgical resection of the entrapped nerve branch led to complete pain relief.
  • The athlete regained full capacity to participate in sports after the nerve decompression.

Implications:

  • Intramuscular sciatic nerve branch entrapment by scar tissue is a rare but critical consideration for unexplained athletic incapacity post-hamstring injury.
  • The severity and location of hamstring muscle injuries can significantly impact functional recovery and outcomes.