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M76.5 Patellar Tendinitis – ICD-10 Explained
M76.5 is the ICD-10 code for patellar tendinitis, also known as jumper's knee – a painful overuse condition affecting the patellar tendon at the knee joint.
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M76.5 is the ICD-10 code for patellar tendinitis, also known as jumper's knee – a painful overuse condition affecting the patellar tendon at the knee joint.
What does ICD-10 code M76.5 mean?
The ICD-10 code M76.5 refers to patellar tendinitis, commonly known as jumper's knee. It is an overuse injury affecting the patellar tendon, which connects the lower pole of the kneecap (patella) to the shinbone (tibia). The code belongs to the group of enthesiopathies – conditions involving inflammation or degeneration at the attachment points of tendons and ligaments to bone.
Causes
Patellar tendinitis typically develops due to repetitive mechanical overload of the knee, especially in sports or activities involving frequent jumping, running, or sudden directional changes. Common causes include:
- High-intensity sports (e.g., basketball, volleyball, track and field)
- Rapid increases in training load or volume
- Muscular imbalances or reduced flexibility of the quadriceps or hamstrings
- Training on hard surfaces
- Biomechanical issues such as valgus knee alignment or flat feet
Symptoms
The hallmark symptom is pain at the lower border of the kneecap, which typically presents as:
- Pain during loading activities such as jumping, climbing stairs, or squatting
- Tenderness on palpation of the patellar tendon insertion
- Morning stiffness or start-up pain after periods of rest
- In advanced stages: persistent pain even at rest
Symptoms often develop gradually and can become chronic if left untreated.
Diagnosis
Diagnosis is primarily clinical, based on patient history and physical examination. Imaging studies used to confirm the diagnosis include:
- Ultrasound: To visualize tendon structure and detect degenerative changes
- MRI (Magnetic Resonance Imaging): For unclear cases or suspected tendon rupture
- X-ray: To rule out bony abnormalities or calcifications
Treatment
Conservative Treatment
Most cases respond well to conservative management:
- Load management: Reducing or modifying sports activity (complete rest is usually not necessary)
- Physiotherapy: Eccentric quadriceps strengthening is considered the gold standard
- Stretching and mobilization of surrounding muscle groups
- Cryotherapy and short-term use of anti-inflammatory medications (e.g., ibuprofen)
- Extracorporeal shockwave therapy (ESWT)
- Patellar tendon straps or taping for pain relief
Surgical Treatment
In chronic, treatment-resistant cases, surgical intervention may be considered, such as tendon debridement (removal of degenerated tissue) or arthroscopic procedures.
Prognosis
With early and appropriate treatment, the prognosis is generally good. Most patients can return to full sporting activity within weeks to months. Without treatment, there is a risk of chronification or tendon rupture.
References
- World Health Organization (WHO): ICD-10 International Classification of Diseases, 10th Revision – Code M76.5.
- Lian ØB, Engebretsen L, Bahr R: Prevalence of jumper's knee among elite athletes from different sports. American Journal of Sports Medicine, 2005; 33(4): 561–567.
- Zwerver J, Bredeweg SW, van den Akker-Scheek I: Prevalence of jumper's knee among nonelite athletes from different sports. American Journal of Sports Medicine, 2011; 39(9): 1984–1988.
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