Can platelet-rich plasma injections heal tendon injuries?

Does PRP work for Achilles tendon injuries? The strongest evidence says no.

For a complete rupture of the Achilles tendon, the most rigorous study available—a large, placebo-controlled trial of 230 patients—found that a PRP injection provided no benefit. At two years after the injury, patients who received PRP reported the same level of function (measured by the Achilles Tendon Total Rupture Score) as those who received a placebo injection [1]. A separate analysis of this same trial data confirmed that the probability of PRP providing a meaningful clinical improvement was less than 0.001% [4].

A broader analysis of 13 randomized trials on Achilles tendon problems (both ruptures and tendinopathy) also found no consistent benefit from PRP. While there was a temporary improvement in pain scores at three months for tendinopathy, this did not translate into better long-term function, return to sport, or patient satisfaction [3]. For ruptures specifically, PRP did not improve function, heel lift height, or calf circumference at any time point up to a year [3].

PRP shows promise as a surgical aid for rotator cuff tears.

The evidence for PRP in rotator cuff injuries is more positive, but it is used differently. Instead of a simple injection, PRP is often applied as a gel directly to the tendon-bone interface during arthroscopic repair surgery. A study of 152 patients found that those who received a PRP gel during surgery had significantly better outcomes at six months: 89% achieved favorable tendon healing on MRI compared to 54% in the control group, and the retear rate was much lower (2.2% vs. 13.1%) [2]. Patients also reported greater improvements in shoulder function and pain [2].

Laboratory research supports this finding. Studies in mice and rats show that PRP can improve the healing of the tendon-bone interface, which is the critical point of failure in rotator cuff repairs [5][6]. One study found that a PRP-loaded hydrogel promoted bone and tendon regeneration in a rat model, leading to superior repair compared to surgery alone [6]. However, not all animal studies agree; one rabbit study found that adding PRP to a surgical scaffold did not provide any additional benefit over the scaffold alone [7].

Why does PRP work for some tendon injuries but not others?

The key difference likely lies in how PRP is delivered and the type of injury. For an acute Achilles rupture, a single injection into the gap between the torn tendon ends may not be enough to influence the complex healing process [1]. In contrast, for rotator cuff surgery, the PRP gel is placed precisely at the tendon-bone interface and held in place, providing a sustained release of growth factors directly where new tissue needs to form [2][6].

The type of PRP also matters. PRP can be 'leukocyte-rich' (containing many white blood cells) or 'leukocyte-poor'. A mouse study found that leukocyte-rich PRP was better for early healing, while leukocyte-poor PRP was better for the later stages of tendon-bone healing [5]. This suggests that the optimal PRP formulation may depend on the specific phase of healing you are trying to target. Furthermore, a patient's own health can affect results; for example, high uric acid levels (hyperuricemia) can alter how tendon cells respond to PRP, potentially reducing its anti-inflammatory effects [8].

About These Sources

This answer is built on 8 peer-reviewed studies — published from 2015 to 2026, 4 from 2024 or later, 2 in Q1 journals, collectively cited 55 times — selected as the most relevant from 13 studies that passed quality screening, drawn from 76 papers retrieved from a database of over 500 million.

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