Login or Register to unlock everything MedSchool has to offer!

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

P

R

S

T

U

V

W

X

Z

 

Patellar Tap

Overview

  • The patellar tap test assesses for an effusion of the knee joint; in a patient with a significant effusion there will be fluid behind the patella, and tapping the knee will result in a satisfying clunk as the patella makes contact with the femur posteriorly.
    • How to Perform

    • Using 2-3 fingers, sharply tap onto the patient's patella.
    • Abnormal If

    • A palpable ‘clunk' occurs, when the patella makes contact with the trochlea.
    • Causes of Knee Effusion

    • Trauma - ligament tear, menisceal tear, fracture, patellar dislocation
    • Arthritis - osteoarthritis, psoriatic arthritis, reactive arthritis, IBD-related arthritis, gout, pseudogout
    • Infection - septic arthritis, tuberculosis, Lyme disease, syphilis
    • Blood - haemarthrosis
    • Malignancy - osteosarcoma
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Associated Diseases
BETA

Infectious Diseases
Musculoskeletal
Other
Feedback