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Related Experiment Video

Updated: Dec 3, 2025

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

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Spontaneous atraumatic knee haemarthrosis.

Sefa William Canbilen¹, Khaldoun El Abed², Riaz Ahmad²

¹Trauma & Orthopaedics, Weston General Hospital, Weston-super-Mare, North Somerset, UK s.canbilen1@nhs.net.

BMJ Case Reports

|October 31, 2020

Summary

Spontaneous knee haemarthrosis, often seen in elderly patients with osteoarthritis, may stem from bleeding peripheral arteries. This case highlights these arteries near the lateral meniscus posterior horn as a likely source in active individuals.

Keywords:

knee injuries meniscal tears orthopaedics osteoarthritic knww

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Area of Science:

Orthopedics
Vascular Anatomy
Sports Medicine

Background:

Spontaneous knee haemarthrosis is rare, primarily affecting elderly individuals with osteoarthritis.
Peripheral arteries supplying the lateral meniscus posterior horn are increasingly implicated as the bleeding source.

Observation:

A 62-year-old active male presented with acute left knee pain, swelling, and limited mobility.
He had a history of osteoarthritis and prior arthroscopic partial lateral meniscectomy.
Clinical presentation included a large haemarthrosis confirmed by aspiration.

Findings:

MRI revealed extensive chondral loss, complex lateral meniscus tearing, and loose bodies.
Arthroscopy identified a bleeding point, treated with debridement and diathermy.
The findings support the hypothesis of bleeding peripheral arteries supplying the lateral meniscus posterior horn.

Implications:

This case reinforces the understanding of spontaneous knee haemarthrosis etiology in active patients.
It suggests a potential source of bleeding in cases of knee haemarthrosis without apparent trauma.
Further investigation into meniscal vascularity may be warranted for managing such conditions.