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Jumper's KneeAka: Patellar Tendonitis, Patellar Tendinopathy, Patellar Tendon Rupture
- Epidemiology
- Males affected more often (6:1 ratio)
- Ages 25 to 40 most often affected
- Tendonitis without rupture occurs in teen boys
- Associated with jumping sport during growth spurt
- Risk factors
- Athletes in jumping sports
- High jump
- Basketball
- Football
- Gymnastics
- Comorbid conditions
- Other associated factors
- Knee Local Corticosteroid Injections
- Repetitive trauma to knee extensor tendon
- Athletes in jumping sports
- Signs
- Large Knee Effusion
- Defect between tibial tubercle and inferior patella
- Difficult active knee extension
- Differential Diagnosis
- Patellar Dislocation
- Quadriceps tendon rupture (elderly)
- Tibial tuberosity avulsion (adolescents)
- Radiology
- Insall-Salvati Ratio for Patella evaluation
- Distance ratio between
- Proximal tibial tubercle
- Inferior pole of the patella
- Normal ratio: +1 or -0.2
- Distance ratio between
- Interpretation: Severe patella alta (high riding)
- Suggests patellar ligament rupture
- Insall-Salvati Ratio for Patella evaluation
- Management
- Surgical Correction within 10 days of injury
- Cast immobilization for 6 weeks following surgery
- Physical therapy
- Complications: Associated with delayed surgery
- Quadriceps contracture shortens extensor mechanism
- References
Patellar tendonitis (C0158317) | |
|---|---|
| Concepts | Disease or Syndrome (T047) |
| ICD9 | 726.64 |
| English | Patellar tendinitis, Patellar tendonitis |
| Spanish | tendinitis patelar, tendinitis rotuliana |
| Parent Concepts | Knee enthesopathy NOS (C0158313), Tendinitis (C0039503), Inflammatory disorder of extremity (C1285336), Disorder of knee (C1290879) |
| Sources | ICD9CM, SCTSPA, SNOMEDCT Derived from the NIH UMLS (Unified Medical Language System) |
