Understanding Tendinopathy Pathology
Modern physiotherapy has shifted from viewing tendinopathy as a purely inflammatory condition to understanding it as a failed healing response. The continuum model proposed by Cook and Purdam (Br J Sports Med, 2009) remains the gold standard for conceptualizing this process. It suggests a spectrum from reactive tendinopathy to tendon disrepair and eventually degenerative change.
Clinicians must identify where a patient sits on this spectrum. Reactive tendinopathy, often caused by acute overload, presents differently than the chronic structural changes seen in long-term athletes. This distinction is critical for tailoring the initial phase of treatment.
The Role of Mechanical Loading
Therapeutic exercise remains the primary intervention for tendinopathy. The mechanism of action is likely tied to mechanotransduction, where mechanical forces are converted into biochemical signals to stimulate collagen synthesis. According to Malliaras et al. (Br J Sports Med, 2015), loading should be progressive and specific to the patient's functional demands.
Heavy Slow Resistance (HSR) training has gained significant traction in the literature. Kongsgaard et al. (Scand J Med Sci Sports, 2009) demonstrated that HSR is as effective as eccentric-only training for patellar tendinopathy. The controlled tempo allows for maximum tendon tension, which is essential for remodeling.
Managing Pain During Rehabilitation
Clinicians often struggle with the 'pain-monitoring model' during rehabilitation. Recent research suggests that moderate pain during exercise is acceptable, provided it subsides within 24 hours. Silbernagel et al. (J Orthop Sports Phys Ther, 2015) advocate for this approach to avoid excessive fear-avoidance behaviors.
However, it is vital to monitor for morning stiffness, which is a classic indicator of acute tendon irritation. If pain levels fail to settle, the clinician must adjust the load or the frequency of the exercises. This nuance differentiates a skilled therapist from one who follows a rigid protocol.
Adjuncts and Emerging Therapies
While exercise is the cornerstone, clinicians often query the utility of passive modalities. Isometric exercise has emerged as a powerful tool for immediate pain relief in tendinopathy. Rio et al. (Br J Sports Med, 2015) found that isometric contractions can induce significant analgesic effects, potentially through cortical inhibition.
Conversely, the evidence for passive treatments like ultrasound or laser remains weak or inconclusive. While they may provide temporary symptomatic relief, they do not address the underlying pathology of mechanical insufficiency. Prioritizing active, load-based interventions is essential for long-term success.
Long-Term Progression and Return to Sport
Rehabilitation must culminate in the restoration of energy storage and release capacities. Tendons function as springs, and if they cannot tolerate high-rate loading, the patient will struggle to return to explosive sports. This requires a transition from slow, heavy lifting to plyometrics and sport-specific drills.
Malliaras et al. (Br J Sports Med, 2015) emphasized that the speed of progression should be dictated by the patient's capacity rather than fixed timelines. Clinicians must conduct regular reassessments of both pain and tendon-specific functional capacity to ensure safety.
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, 43(6), 409-416.
Kongsgaard, M., et al. (2009). Corticosteroid injections, eccentric decline squat training and heavy slow resistance training in patellar tendinopathy. Scandinavian Journal of Medicine & Science in Sports, 19(6), 790-802.
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, 49(16), 1059-1065.
Rio, E., et al. (2015). Isometric exercise induces analgesia and reduces inhibition in patellar tendinopathy. British Journal of Sports Medicine, 49(19), 1277-1283.
Silbernagel, K. G., et al. (2015). Managing Achilles tendinopathy: A qualitative research study. Journal of Orthopaedic & Sports Physical Therapy, 45(12), 990-998.
