Achilles Tendinopathy Toolkit: Section A - Clinical Evaluation

Original Editor - User Name Top Contributors - Kim Jackson and Olajumoke Ogunleye  
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Introduction[edit | edit source]

The purpose of this document is to summarize the clinical evaluation of somebody who has been diagnosed with Achilles Tendinopathy.

The first steps involved in assessing a person presenting with Achilles tendinopathy is to carry out a subjective and objective examination, including a detailed history, to confirm the diagnosis. The toolkit leads you through the process of identifying potential risk factors association with Mid-Portion Achilles Tendinopathy, important questions and observations that form part of the subjective and objective assessment, as well as discussing Functional Tests and Differential Diagnosis.

Risk Factors[edit | edit source]

There are potential risk factors associated with mid-portion achilles tendinopathy. These can be further classified as non-modifiable and modifiable risk factors:

  • Non-Modifiable Risk Factors
    • mid-age 30-60 years [ref 3,5]
    • male>female [ref 6]
    • Metabolic Disorders:
      • Renal disease [ref 3] - Urate deposits (tophi) in the Achilles tendon related to hyperuricemia (gout) [ref 7]
      • Diabetes [ref 3]
    • Family history:
      • Familial Hypercholesterolemia (HeFH) [ref 3] - New onset of Achilles tendon pain is often the first sign of hypercholesterolemia and should be investigated for serum cholesterol levels. [ref 7]. Tendon Xanthomas are fatty deposits from high cholesterol levels and commonly found at the Achilles tendon.
      • Genetic variants [ref 2,3] -Certain genetic polymorphisms predispose tendon to altered collagen structure.
    • Systemic Inflammatory Disorder:
      • Seronegative Spondyloarthropathy (SpA) - 98% of SpAhave at least one enthesis disorder, commonly at the Achilles tendon.[ref 9]. Consider use of SpAscreening tools such as SCREEND’EM [ref 9]
  • Modifiable Risk Factors
    • Lifestyle:
      • Smoking [ref 2,8]
      • Obesity [ref 3,7]
      • Alcohol (moderate consumption) [ref 2]
      • Sedentary behaviour, inactivity [ref 3]
    • Medications:
      • Fluoroquinolones [ref 2] - Specifically, Ofloxacin was identified compared to similar anti-biotics from the same drug group. [ref 1]
      • Systemic corticosteroid (long term Prednisone) [ref 10]
      • Hormone Replacement Therapy (HRT) [ref 5]
    • Previous lower extremity tendinopathy [ref 1]
    • Footwear [ref 2,4,5]
    • Biomechanics:
      • Limited dorsiflexion [ref 2,4,5]
      • Decreased plantar flexor strength [ref 2,4,5]
      • Limited hip mobility [ref 2]
      • Altered gait pattern [ref 2]
      • Foot posture and mechanics [ref 5] - Static exam: hindfoot INV/EV (subtalar mobility)[ref 5]
      • Dynamic exam: excess foot pronation [ref 2]
    • Training Errors:
      • Training load - abrupt change in load, intensity, or volume [ref 4]
      • Training environment - higher risk with cold weather and winter training season [ref 1]

Assessment[edit | edit source]

Things to look out for when assessing for achilles tendinopathy include taking a thorough history from the patient including a detailed discussion about symptoms, the onset of injury and location of pain, as well as objective signs and biopsychological factors.

Subjective Assessment[edit | edit source]

The subjective assessment allows the patient to share details of the history of the injury, their current status, function, activity level, symptoms as well as any biopsychosocial factors that may have an impact on their treatment and recovery.

  • Subjective Symptoms [ref 16]
    • Location -described in mid-portion of Achilles tendon.
    • Morning pain and stiffness –described on initial weight bearing upon rising from bed or following periods of inactivity.
  • History
    • Gradual onset of symptoms.
    • Pain with loading activity –sport or daily living.
  • Biopsychosocial Factors
    • Psychological factors, such as fear of movement (kinesiophobia),[ref 11] as well as fears and beliefs about injury, may contribute to pain sensitivity.[ ref 12]
    • Nervous System Sensitivity is characterized by allodynia and hypersensitivity, and has been considered to be a factor in persistent Achilles tendon pain.[ref 13,14,15]
  • Objective Signs/Observations
    • Biomechanical Impairments:[ref 5]
      • Plantarflexorweakness
      • Dorsiflexion stiffness
      • Abnormal foot mechanics and lower limb abnormalities
    • Palpation tests - Localized tenderness in a zone 2-6 cm above calcaneal insertion in mid-portion of the Achilles tendon. Swelling or thickening may or may not be present. Some studies suggest that only palpation testing was found to be reliable and accurate for diagnosing Achilles tendinosis. [ref 16,17,18] A combination of palpation tests is recommended in describing mid-portion Achilles tendinopathy. [ref 17,18] A selection of the palpation tests are listed below:
      • Palpation“pinch test” [ref 17,18 - In prone lying, ankle relaxed with foot hanging freely. Most painful site located by pinch pressure applied from proximal to distal along the length of the Achilles tendon. Mid-portion Achilles tendinopathy is identified in a zone 2-6 cm above the calcaneal insertion.
      • Arc Sign [ref 17,18] - Prone lying, ankle relaxed with foot hanging freely. Pinch pressure exploring for palpable thickness, swelling or nodule within mid-portion of Achilles tendon. In absence of thickness, a default area 3cm above the calcaneal insertion is located. The client is asked to perform active ankle dorsiflexion/plantarflexion cycles, palpating tendon movement under fingertips. Positive sign when tendon abnormality is felt to move concurrent with active movement. If thickened tissue moves independently or remains stationary, consider lesion to be instead within the para-tendon (synovial sheath) or outside of the tendon structure.
      • Royal London Hospital test [ref 17, 18] - In prone lying, ankle relaxed with foot hanging freely. Palpate ‘pinch test’ to locate most tender site of mid-portion of Achilles tendon. Active dorsiflexion results in less tenderness/absence of tenderness at pinch site.

Functional Tests: Tendon Loading Tests[edit | edit source]

It is important to understand the concept of load and capacity not only when assessing and diagnosing tendon injuries but it is also useful when assessing how they respond and react to mechanical loads that are placed on them. Two popular tests are listed below:

  • Heel Rise Test (single leg) - A positive test is the report of pain in Achilles tendon upon repeated active plantar flexion on the symptomatic side during a single leg heel rise [ref 17]
  • Hop Test (single leg) - A positive test is the report of pain in Achilles tendon upon hopping or shortly after hopping on the symptomatic side. Test has been described as repeated hopping in place; or performing a single forward hop onto symptomatic side. [ref 17]

Differential Diagnosis[edit | edit source]

Palpation of surrounding tissue assists to rule out disorders that have alternate locations for tenderness experienced outside the zone of mid-portion Achilles tendinopathy symptoms, but which may be confused due to overlapping or similar pain presentations. [ref 7,16,17] - See Table 1

Table 1 - Differential diagnosis of conditions which may be mistaken for Mid-Portion Achilles Tendinopathy

Imaging Studies[edit | edit source]

Physical exam using palpation provides comparable accuracy to medical imaging for diagnosis of mid-portion Achilles tendinopathy (Ultrasonography or MRI).[ref 16] Up to 25% of asymptomatic subjects may have structural changes on imaging, highlighting that expensive and often unwarranted imaging should be limited to cases where diagnosis is uncertain.[ref 17]

Resources[edit | edit source]

References[edit | edit source]

  1. CRTechnologies. Achilles Tendon Palpation Test (CR). Available from: https://www.youtube.com/watch?v=a9FI_0HpQ5Y [last accessed 18 May 2022]
  2. CRTechnologies. Arc Sign Achilles. Available from: https://www.youtube.com/watch?v=zhP0CAsQr7U [last accessed 18 May 2022]
  3. CRTechnologies. Royal London Hospital Test. Available from: https://youtu.be/nM3yu_TR4H8 [last accessed 18 May 2022]