Understanding Tendinopathy Pathology
Tendinopathy is no longer considered a simple inflammatory condition. As described by Cook and Purdam (Br J Sports Med, 2009), it is more accurately viewed as a failed healing response characterized by disorganized collagen, increased ground substance, and neovascularization.
This "continuum model" suggests that tendons move through reactive, dysrepair, and degenerative stages. Clinicians must recognize that clinical symptoms do not always correlate perfectly with structural changes visualized on ultrasound or MRI.
The Role of Progressive Loading
Exercise remains the gold standard for management. According to the systematic review by Malliaras et al. (Br J Sports Med, 2015), heavy slow resistance (HSR) and eccentric loading are both effective, though patient preference and adherence should dictate the choice.
Recent research emphasizes that load management is about more than just tendon morphology. It is about restoring the tendon’s capacity to store and release elastic energy efficiently under load.
Heavy Slow Resistance vs. Eccentrics
While Alfredson’s eccentric protocol was revolutionary, recent data suggests HSR may offer superior long-term adherence. Kongsgaard et al. (Scand J Med Sci Sports, 2010) demonstrated that HSR provided comparable, if not superior, outcomes to eccentric training in patellar tendinopathy.
The key mechanism is the mechanical loading of the tenocytes, which stimulates collagen synthesis. Physiotherapists should prioritize high-load, slow-tempo exercises to modulate pain and improve tendon tolerance.
Managing Kinetic Chain Deficits
Focusing solely on the tendon can be a clinical mistake. A systematic review by van der Worp et al. (Sports Med, 2011) suggests that proximal hip and core strength are often deficient in athletes with lower limb tendinopathies.
By addressing kinetic chain impairments, we reduce the total mechanical demand on the injured tendon during sport-specific tasks. This systemic approach is vital for preventing recurrences in high-performing athletes.
The Role of Isometric Loading
Isometric exercises have emerged as a powerful tool for immediate analgesic effects. Rio et al. (Br J Sports Med, 2015) demonstrated that isometric loading of the patellar tendon reduced cortical inhibition and provided rapid pain relief.
This makes isometric holds an excellent "entry point" for irritable tendons. They allow for high-load stimulation without the cyclical shearing forces that may exacerbate symptoms during the reactive stage.
Pharmacological and Adjunct Therapies
Clinicians often face pressure to use modalities like corticosteroids or PRP. However, the evidence remains conflicted. According to Scott et al. (Br J Sports Med, 2015), corticosteroid injections may provide short-term relief but are associated with poorer long-term outcomes and potential tendon weakening.
Physiotherapists should advocate for mechanical loading as the primary intervention. Adjuncts should only be considered when the patient fails to respond to a structured, progressive loading program.
Future Directions and Nuance
While we have strong evidence for exercise, we still lack clarity on optimal dosage. Determining the exact volume and frequency for individual patients remains more of an art than a science.
Ongoing research into load monitoring tools, such as the session RPE or wearable technology, is helping us better quantify training loads. This helps avoid the dreaded "too much, too soon" trap that frequently leads to tendon injury.
References
Cook, J. L., & Purdam, C. R. (2009). Is tendon pathology a continuum? A pathology model to explain the clinical presentation of load-induced tendinopathy. British Journal of Sports Medicine.
Kongsgaard, M., et al. (2010). Corticosteroid injections, eccentric decline squat training and heavy slow resistance training in patellar tendinopathy. Scandinavian Journal of Medicine & Science in Sports.
Malliaras, P., et al. (2015). Achilles and patellar tendinopathy loading programmes: a systematic review comparing clinical outcomes and models of care. British Journal of Sports Medicine.
Rio, E., et al. (2015). Isometric exercise induces analgesia and reduces inhibition in patellar tendinopathy. British Journal of Sports Medicine.
Scott, A., et al. (2015). Sports-related overuse injuries of the tendon. British Journal of Sports Medicine.
van der Worp, H., et al. (2011). Risk factors for patellar tendinopathy: a systematic review of the literature. Sports Medicine.
