Quadriceps Tendinopathy M76.899 726.60

ICD-9 Classification / Treatment
Etiology / Natural History Associated Injuries / Differential Diagnosis
Anatomy Complications
Clinical Evaluation Follow-up Care
Xray / Diagnositc Tests Review References
  • synonyms: Quadriceps tendinitis, quad tendinitis, quadriceps tendinosis, quad tendinosis,

Quadriceps Tendinitis ICD-10

Quadriceps Tendinitis ICD-9

  • 726.60 = enthesopathy of knee , unspecified.

Quadriceps Tendinitis Etiology / Epidemiology / Natural History

  • Uncommon
  • Chonric tendon degeneration without inflammation
  • Associated with jumping sports: volleyball, basketball, high jump, long jump.

Quadriceps Tendinitis Anatomy

  • Knee extensor mechanism = rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius.
  • Quadriceps tendon has three layers. Superficial layer = rectus femoris. Intermediate layer = vastus medialis and lateralis. Deep Layer = vastus intermedius.
  • Quadriceps tendon has a hypovascular area 1-2cm superior to the patella. (Yepes H, JBJS 2008:90A:2135).

Quadriceps Tendinitis Clinical Evaluation

  • Localized tenderness at the insertion of the quadriceps tendon into the proximal pole of the patella, generally resulting from repetivie activities, high level athletes playing on hard surfaces.
  • May have pain with knee extension against resistance.
  • May be associated with clicking. 

Quadriceps Tendinitis Xray / Diagnositc Tests

  • Weight -bearing A/P, lateral and sunrise views of the knee are generally normal.

Quadriceps Tendinitis Classification / Treatment

  • Rest, activity modifications, physical therapy (hamstring stretching, ice, massage, ultrasound, iontophoresis, phonophoresis)
  • May consider platelet rich plasma injection
  • Surgery: rarely indicated. Excision of degenerative tissue and calcifications (Ferretti A, Int 1985;239).

Quadriceps Tendinitis Associated Injuries / Differential Diagnosis

Quadriceps Tendinitis Complications

Quadriceps Tendinitis Follow-up Care

Quadriceps Tendinitis Review References