Beyond the Tendon: The Biopsychosocial Model in Tendinopathy Management

If you've been managing tendinopathy purely through a structural and mechanical lens — load it progressively, address the tissue, fix the movement pattern — you're doing better than most. But you're probably also noticing that some patients don't respond the way the evidence says they should.

They comply with the program. Their loading is well-dosed. But progress stalls, or the tendon keeps flaring with stimuli that shouldn't produce that response. The tissue model doesn't fully explain what you're seeing.

That's where the biopsychosocial (BPS) framework becomes clinically essential — not as a soft adjunct to "real" treatment, but as an explanatory and therapeutic tool with growing empirical support.

The Limits of the Structural Model

The degenerative tendon model — tendon pathology → pain → loading to reverse pathology → pain resolves — is elegant and often useful. But it has well-documented limitations.

Cook and Purdam's continuum model gave us a more nuanced structural framework, and the work from the La Trobe and Queensland research groups on load management has significantly improved outcomes. But even well-executed loading programs don't uniformly produce symptom resolution, and the correlation between structural change (on imaging) and pain is notoriously inconsistent.

Asymptomatic tendon pathology is common. Painful tendons aren't always structurally compromised. Pain can persist well after structural normalisation, and can flare in response to non-mechanical inputs — stress, poor sleep, psychosocial threat. These observations demand a broader explanatory model.

What the BPS Model Actually Claims

The biopsychosocial model, as Engel originally proposed it and as it has been refined in musculoskeletal pain research, is not an argument that tendon pain is "all in the head." That misreading is common and frustrating. It's an argument that pain is a multidimensional output — influenced by biological, psychological, and social inputs simultaneously.

For tendinopathy specifically, this means:

Biological factors include tendon structure and pathology, load history, vascular changes, nociceptive sensitisation at the tissue level, and systemic factors (metabolic comorbidities, medication effects, hormonal context).

Psychological factors include pain catastrophising, fear-avoidance beliefs, expectations of recovery, self-efficacy, anxiety, and depression. These are not character flaws — they're modifiable variables with measurable effects on outcomes.

Social factors include occupational demands, athletic identity, social support, financial pressure around return to work or sport, and healthcare interactions themselves (what a clinician says about imaging findings can set a patient's trajectory).

Telling a patient their tendon is "degenerative" or "structurally compromised" based on imaging alone can directly increase pain catastrophising and avoidance behaviour. Words are clinical interventions.

The Evidence on Psychological Variables in Tendinopathy

The research here is still maturing, but several findings are consistent enough to be clinically actionable.

A 2019 systematic review by Mallows et al. examined psychological factors in tendinopathy and found that pain catastrophising, fear of movement, and low recovery expectations were associated with poorer outcomes across patellar, Achilles, and lateral elbow presentations. The effect sizes were modest but consistent.

Work from Malliaras and colleagues on Achilles tendinopathy has highlighted that psychological readiness and self-efficacy for loading correlate with programme adherence — which is one of the primary predictors of outcome in progressive loading protocols.

For lateral elbow tendinopathy specifically, Bisset and colleagues' seminal 2006 RCT demonstrated that physiotherapy with exercise produced better long-term outcomes than corticosteroid injection — but also showed that a significant proportion of patients in all groups had ongoing symptoms at 12 months, suggesting factors beyond tissue management are at play.

Central sensitisation is a particularly relevant mechanism in chronic tendinopathy. Patients with longstanding presentations often exhibit pressure pain thresholds that are reduced not just at the affected tendon, but at remote sites — a hallmark of centralised pain processing. The clinical implication: these patients may respond poorly to loading escalation alone and may need pain science education and nervous system down-regulation as part of the treatment approach.

Practical Integration: What This Looks Like in the Clinic

I want to offer concrete frameworks rather than abstract principles.

Screen for catastrophising early. The Pain Catastrophising Scale (PCS) takes under five minutes and gives you a baseline. Patients scoring high on rumination and helplessness subscales often need explicit discussion of pain neuroscience before loading will be tolerated effectively. Loading an catastrophising patient with a degenerative tendon narrative is setting them up for avoidance.

Deliver a coherent, non-threatening narrative about tendon pain. The evidence strongly supports explaining tendon pain as a sensitivity issue and a capacity issue — not a structural damage issue. Phrases like "your tendon is irritable, not broken" and "pain during loading is expected and acceptable within limits" directly address catastrophising without dismissing the patient's experience.

Address fear-avoidance with graded exposure, not just graded load. Some patients have movement patterns that reflect genuine biomechanical compensation, and others have movement patterns that reflect fear. The clinical distinction matters. Graded exposure — systematically approaching feared activities with structured monitoring — is the evidence-based approach for the latter.

Ask about sleep and stress as part of load management. I frame this to patients as: "Your tendon's tolerance for load isn't fixed — it changes based on how recovered your system is. A night of poor sleep or a high-stress week can lower your threshold." This is accurate, non-stigmatising, and gives patients agency. It also explains flares that don't have a mechanical cause.

Watch your language around imaging. Ultrasound and MRI findings in tendinopathy frequently show changes in asymptomatic individuals. When you discuss imaging with patients, frame findings in terms of adaptability, not damage. "This shows your tendon has been under significant load and has changed in response — that's reversible with the right programme" is very different from "you have significant degeneration."

When to Refer or Expand Your Scope

The biopsychosocial model doesn't require every physiotherapist or RMT to become a psychologist. But it does require us to recognise when the psychological or social dimension is dominating the clinical picture.

Indicators that a patient may need additional support beyond standard tendinopathy management include: severe or escalating pain catastrophising that isn't responding to education, significant depression or anxiety requiring concurrent treatment, complex workplace or medicolegal contexts, or a history of pain that is out of proportion to the clinical findings across multiple body systems.

In these cases, collaborative care — with a psychologist, GP, or pain specialist — produces better outcomes than continuing to optimise the loading program.

The Bottom Line for Clinicians

Tendons are not just ropes. The patient attached to the tendon brings a history, a set of beliefs, a social context, and a nervous system that is actively interpreting and generating the pain experience. A mechanical loading program is the foundation of good tendinopathy management — and it works well for many patients. But for the ones who don't respond as expected, the answer is rarely "more load" or "different load." It's often found by looking at the full picture.

The clinicians who are getting the best outcomes in tendinopathy are the ones who can hold both the tissue model and the person model at the same time — and know which one needs more attention on a given day.