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M76.1 Patellar Tendinopathy – Causes and Treatment
M76.1 is the ICD-10 code for patellar tendinopathy, also known as jumper's knee. It is a painful overuse condition of the patellar tendon, common in athletes.
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M76.1 is the ICD-10 code for patellar tendinopathy, also known as jumper's knee. It is a painful overuse condition of the patellar tendon, common in athletes.
What is M76.1 – Patellar Tendinopathy?
The ICD-10 code M76.1 refers to patellar tendinopathy, commonly known as jumper's knee. It is an overuse injury affecting the patellar tendon (ligamentum patellae), which connects the lower pole of the kneecap (patella) to the shinbone (tibia). This tendon is essential for knee extension and plays a key role in jumping, running, and kicking movements.
Causes
Patellar tendinopathy develops due to repetitive mechanical stress and micro-structural damage to the tendon. Common causes include:
- Sports involving frequent jumping and landing (e.g., basketball, volleyball, track and field)
- Sudden increases in training load or frequency
- Muscular imbalances or tight quadriceps and hamstring muscles
- Training on hard surfaces
- Biomechanical abnormalities (e.g., patellar malalignment, overpronation)
- Genetic predisposition to tendon disorders
Symptoms
The hallmark symptom is pain at the lower pole of the kneecap, typically aggravated by physical activity. Symptoms may progress over time:
- Pain at the start of physical activity that may ease during warm-up
- Pain during and after exercise
- Tenderness directly at the inferior patellar border
- Swelling or thickening along the patellar tendon
- In advanced stages: pain during everyday activities such as climbing stairs
Symptoms are commonly graded using the Blazina classification, ranging from pain only after activity (Grade 1) to complete tendon rupture (Grade 4).
Diagnosis
Diagnosis is primarily clinical, based on patient history and physical examination, supported by imaging:
- Clinical examination: Point tenderness at the inferior patellar pole, pain with squatting or single-leg decline squat
- Ultrasound: Visualization of tendon thickening, structural changes, or calcifications
- MRI (Magnetic Resonance Imaging): Assessment of severity and exclusion of associated injuries
- X-ray: To rule out bony changes or calcifications
Treatment
Conservative Treatment
The majority of patients respond well to conservative management:
- Load management: Reduction or temporary cessation of aggravating activities
- Physiotherapy: Eccentric and heavy slow resistance exercise programs (e.g., decline squat protocol), stretching and strengthening of the quadriceps
- Bracing and taping: Patellar tendon straps to offload the tendon
- Anti-inflammatory measures: Ice application, NSAIDs (non-steroidal anti-inflammatory drugs) for acute pain relief
- Extracorporeal shockwave therapy (ESWT): Effective for chronic cases
- PRP injections: Platelet-rich plasma injections in selected cases to support tendon healing
Surgical Treatment
If conservative treatment fails after at least 3 to 6 months, surgical intervention may be considered. This typically involves arthroscopic or open debridement of degenerated tendon tissue and removal of bone spurs.
Prognosis
With consistent and appropriate treatment, the prognosis is generally good. Most athletes are able to return to sport within 3 to 6 months. Chronic cases may require longer rehabilitation. Complete tendon rupture is rare but requires surgical repair and extended recovery.
References
- Lian OB, 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.
- Peers KH, Lysens RJ. Patellar tendinopathy in athletes: current diagnostic and therapeutic recommendations. Sports Medicine. 2005;35(1):71-87.
- World Health Organization. ICD-10 International Statistical Classification of Diseases and Related Health Problems, 10th Revision. M76.1 – Patellar tendinitis.
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