ContentsSynopsisCodesLook ForDiagnostic PearlsDifferential Diagnosis & PitfallsBest TestsManagement PearlsTherapyDrug Reaction DataReferencesView all Images (6)
Patellar tendon rupture
Other Resources UpToDate PubMed

Patellar tendon rupture

Contributors: Robert Lachky MD, Sandeep Mannava MD, PhD
Other Resources UpToDate PubMed

Synopsis

Patellar tendon rupture results from forceful contraction of the quadriceps muscles resisted by a flexed knee (eccentric contraction, knee flexion against a fully contracted quadriceps muscle). Patellar tendon rupture usually occurs after chronic degeneration of the tendon has already taken place. It can affect adults of any age but usually occurs in patients younger than 40. It is very rare in the pediatric population. The condition is more common in men than women.

Risk factors include being immunocompromised / systemic disease, taking systemic corticosteroids, and use of anabolic steroids as well as patellar tendinitis, past injury, or degeneration. A history of cortisone injection into a patella tendon is associated with a high rate of tendon rupture.

Patellar tendon rupture presents with pain. There will be a palpable defect in the region of the patellar tendon. Patients may report hearing a "pop" or feeling their knee give way. The patient will have an inability to perform a straight leg raise (raise their heel from the exam table while the knee is fully extended).

The condition can be an acute or chronic (delayed presentation > 6 weeks).

It is a rare but well-described condition to have simultaneous contralateral extensor mechanism injury.

Codes

ICD10CM:
M66.269 – Spontaneous rupture of extensor tendons, unspecified lower leg

SNOMEDCT:
30832001 – Rupture of patellar tendon

Look For

Subscription Required

Diagnostic Pearls

Subscription Required

Differential Diagnosis & Pitfalls

Best Tests

Subscription Required

Management Pearls

Subscription Required

Therapy

Subscription Required

Drug Reaction Data

Below is a list of drugs with literature evidence indicating an adverse association with this diagnosis. The list is continually updated through ongoing research and new medication approvals. Click on Citations to sort by number of citations or click on Medication to sort the medications alphabetically.

Subscription Required

References

Subscription Required

Last Reviewed:02/04/2020
Last Updated:02/04/2020
Copyright © 2021 VisualDx®. All rights reserved.
Patellar tendon rupture
Copyright © 2021 VisualDx®. All rights reserved.