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M76.8 – Enthesopathies of the Lower Limb
M76.8 is an ICD-10 diagnosis code for other enthesopathies of the lower limb, excluding the foot. These conditions affect tendon and ligament attachment sites, causing pain and restricted movement.
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M76.8 is an ICD-10 diagnosis code for other enthesopathies of the lower limb, excluding the foot. These conditions affect tendon and ligament attachment sites, causing pain and restricted movement.
What is M76.8?
M76.8 is a diagnostic code from the ICD-10 classification system (International Classification of Diseases, 10th Revision) and refers to other enthesopathies of the lower limb, excluding the foot. Enthesopathies are conditions affecting the entheses – the sites where tendons, ligaments, or joint capsules attach to bone. Common examples coded under M76.8 include the iliotibial band syndrome (runner's knee), patellar tendinopathy (jumper's knee), bursitis around the knee or hip, and insertional tendinopathies of the thigh, knee, and lower leg.
Causes
Enthesopathies often result from overuse or repetitive mechanical stress at tendon attachment sites. Typical causes include:
- Overuse and repetitive movements: especially common in competitive athletes or physically active individuals
- Biomechanical malalignment: such as leg axis deformities, flat foot, or bow legs/knock knees
- Inflammatory systemic diseases: including psoriatic arthritis, ankylosing spondylitis, or other spondyloarthropathies
- Metabolic disorders: such as gout or diabetes mellitus
- Age-related degeneration: changes in tendon and connective tissue with advancing age
- Trauma: direct injuries or overstretching of the tendon attachment areas
Symptoms
Symptoms of M76.8 vary depending on the affected structure but commonly include:
- Local tenderness on palpation at the affected enthesis
- Load-dependent pain during walking, running, or climbing stairs
- Swelling and occasionally mild redness over the affected area
- Morning stiffness or start-up pain after periods of rest
- Restricted range of motion in the affected joint or limb segment
Diagnosis
Diagnosis of an enthesopathy (M76.8) is based on a combination of:
- Clinical examination: palpation of tendon attachment sites, assessment of range of motion, and pain mapping
- Imaging studies: Ultrasound (sonography) as the first-line modality to detect tendon thickening, calcifications, or bursal changes; MRI (magnetic resonance imaging) for complex findings; X-ray to exclude bony pathology
- Laboratory tests: full blood count, inflammatory markers (CRP, ESR), uric acid, and optionally HLA-B27 testing if an inflammatory systemic disease is suspected
Treatment
Conservative Treatment
Most enthesopathies are initially managed conservatively:
- Rest and load reduction: temporary offloading of the affected region
- Physiotherapy: targeted strengthening and stretching exercises, eccentric training programs
- Analgesics and NSAIDs: non-steroidal anti-inflammatory drugs (e.g. ibuprofen, diclofenac) for pain relief and inflammation control
- Local corticosteroid injections: into the bursa or peritendinous areas for severe symptoms (used cautiously due to the risk of tendon damage)
- Extracorporeal shockwave therapy (ESWT): for chronic cases and calcific deposits
- Orthotic support: insoles, braces, or orthoses to offload the affected area
Surgical Treatment
Surgical intervention is reserved for severe, treatment-resistant cases and may include calcification removal, tendon debridement, or bursectomy.
Treatment of Underlying Disease
When enthesopathy is of inflammatory-rheumatic origin, the underlying condition is treated with disease-modifying antirheumatic drugs (DMARDs) or biologics.
References
- World Health Organization (WHO): International Statistical Classification of Diseases and Related Health Problems, 10th Revision (ICD-10). Geneva: WHO, 2019. https://icd.who.int/browse10
- Benjamin M., McGonagle D.: The anatomical basis for disease localisation in seronegative spondyloarthropathy at peripheral and central sites. Journal of Anatomy, 199(5):503–526, 2001.
- Olivieri I. et al.: Enthesiopathy: clinical manifestations, imaging and treatment. Balliere's Clinical Rheumatology, 12(4):665–681, 1998.
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