Abstract
Purpose of Review
Platelet-rich plasma is used in many orthopedic pathologies such as tendinopathies and ligament injuries. The clinical results reported in the scientific literature are, however, confusing. The aim of this manuscript is to provide a narrative literature review regarding the role of PRP in the most common elbow soft tissue pathologies.
Recent Findings
The response to PRP seems to be favorable when compared to steroid injection for pain management and for patient-reported outcomes in lateral epicondylitis. PRP injection does not seem to have the potential complications associated with a steroid injection such as skin atrophy, discoloration, and secondary tendon tears. Only a few manuscripts comparing the results of PRP treatment with either extracorporeal shockwave (ESW), dry needling, or even surgical treatments in lateral epicondylitis exist. The use of PRP in other elbow pathologies such as golfer’s elbow, ulnar collateral ligament injury, and distal biceps and triceps pathology is examined in few studies, with unclear recommendations.
Summary
Regarding elbow pathologies, PRP injections in tennis elbow seems to be the best-studied intervention. A major limitation in these studies is the significant heterogeneity in the methods used for preparing PRP, for example employing leukocyte-rich, leukocyte-poor preparations, PRP with or without activation, which makes the results of the studies difficult to compare. Results of this review show that more studies on larger cohorts, with comparable formulations, and with longer follow-up are required to give optimal suggestions concerning the use of PRP in elbow pathologies.
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Introduction
Platelet-rich plasma (PRP) is an autologous mixture of platelets and growth factors produced by centrifugation of whole blood [1]. PRP may enhance soft tissue regeneration processes by releasing platelet-derived growth factors, cytokines, and other proteins capable of stimulating and modulating the inflammatory response [2,3,4]. Chen et al. in their meta-analysis suggested that PRP is a safe and efficacious way of supporting tendon and ligament healing [1]. In vitro studies have shown that human tenocyte proliferation increases when cultured in PRP suggesting that PRP mediates the anabolic effect of growth factors enhancing tendon matrix regeneration. An increased TGF beta concentration has been correlated in many studies with the clinical efficacy of PRP [5,6,7].
In contrast to the basic science data, the clinical efficacy of PRP has been reported with conflicting result, including several systematic reviews and meta-analyses [8]. PRP has been used in many soft tissue pathologies such as tendinopathies and ligament injuries. Nevertheless, it remains unclear especially in chronic elbow conditions whether PRP should be recommended as a treatment option before performing a surgical treatment [1, 8,9,10, 11•]. The aim of this manuscript is to provide a narrative literature review regarding the role of PRP in the most common elbow soft tissue pathologies.
Lateral Epicondylitis
Lateral epicondylitis, initially described in 1883 as “lawn-tennis elbow” and later named “tennis elbow” (TE), is the most commonly diagnosed elbow condition [12•, 13]. Epidemiological studies describe a prevalence of 1–3% in general population, with some reports describing data up to 10% in women [14, 15]. While TE has been extensively described by literature, its pathophysiology remains obscure. Historically, it was believed to be an onset of inflammation, but recent studies have revealed a paucity of inflammatory cells [16]. The most commonly reported mechanism is extensor carpi radialis brevis (ECRB) tendon micro-tearing and degeneration due to repetitive overload [16]. Nirschl et al. described the pathology as an angiofibroblastic tendinosis [17]. More recently, postero-lateral micro-instability has been suggested as a possible etiology for TE [18].
Different treatment approaches have been described for TE, starting from rest, bracing, eccentric muscle strengthening, and activity modification to second-line treatments like extracorporeal shockwave therapy, botulinum toxin injection, dry needling, autologous whole blood injection, and PRP. Surgical treatment is usually reserved after failure of conservative management. Steroid injections used to be considered a gold standard in TE management and are actually one of the most commonly performed treatment, but data from the literature do not support this approach as curative [16].
Arirachakaran et al. (Table 1) performed meta-analysis comparing PRP to autologous blood and steroid injection. The response to PRP was favorable when compared to steroid injection for pain management and for patient-reported outcomes. Furthermore, it was reported that PRP injection did not have the complications associated with a steroid injection such as skin atrophy, discoloration, and secondary tendon tears [16]. Two original papers, however, reported higher incidence of local pain after PRP administration [19•, 20•]. Gosens and Peerbooms in a randomized control trial described that steroid injection may give better pain relief in the first months, but after 2 years of follow-up the PRP group reported superior results. Patients who had steroid injections had clinical scores comparable to their baseline at 26 weeks follow-up [12•, 21•]. Similar conclusions were obtained in a meta-analysis by Mi et al. that found better outcomes with PRP at more than 6 months follow-up even though steroid injections gave better scores initially [22]. Comparable findings were also described by Gautam et al. when the Visual Analogue Scale (VAS), Disabilities of the Arm, Shoulder and Hand (DASH), and modified Mayo score were measured after 6 months. [23•] Yadav et al. and Behera et al. reported after 3 months follow-up significant improvement in pain and function in a PRP group. [24•, 25•] The randomized prospective study published by Palacio et al. reported that there was no significant difference in patients’ improvement when treated with PRP, dexamethasone, and neocaine [27•]. Two papers have also reported no significant difference in pain scores between PRP and steroids [22, 26•]. The lack of standardization of PRP preparations, described by Mishra et al., could partially justify the differences in reported outcomes among the studies [28]. In a multicenter randomized controlled trial, Mishra et al. compared the results of extensor tendon needling alone or in association with PRP injections. No significant differences were found at 12 weeks, but clinically meaningful improvements were found in patients treated with leukocyte-enriched PRP compared with an active control group at 24 weeks [29].
As the influence of conditioned plasma on TE remains controversial, some studies focused on the biologic effect of injecting PRP versus autologous blood injection (ABI). Creaney et al. reported no difference in pain scores between PRP and ABI, 6 months after injections. They found both methods to be equal in efficacy and recommended them when conservative treatment failed [30•]. Raeissadat et al. also did not observe a significant difference regarding pain, functional scores, and treatment success in all follow-up examinations (respectively 0, 4, 8, 6, 12 months after the procedure) between ABI and PRP [31•]. Chou et al. published a meta-analysis comparing ABI, PRP, and corticosteroid injections. They found no significant difference between PRP and ABI, with both having superior pain scores to corticosteroid injections [32]. PRP may give faster relief as reported by Thanasas et al. In 6 weeks after an injection, patients in the PRP group had significantly lower pain scores versus those in the ABI group [33•]. Studies are detailed in Table 2.
Even in the best possible scenario, 5 to 15% patients will require a more aggressive approach [34]. Several studies therefore compared results of PRP treatment with either extracorporeal shockwave (ESW), dry needling, or even surgical treatment. Alessio-Mazzola performed a retrospective comparative study with 2 years follow-up comparing PRP injection with extracorporeal shockwave therapy. In the second group, focal ESW was administered by means of an electromagnetic generator equipped with in-line ultrasound (USG) guidance. The authors found no difference in pain scores and patients’ reported outcomes measured with Roles–Maudsley (RM) score, quick Disabilities of the Arm, Shoulder and Hand (QuickDASH) score, and patient-rated tennis elbow evaluation (PRTEE) [35]. Lim et al. reported that needling when combined with PRP injection gives favorable results versus physiotherapy in pain scores, modified Mayo Clinical Performance scores, and even in MRI imaging [36]. Similarly, beneficial results of PRP injections and concomitant needling were also reported by Gaspar et al. Interestingly, this paper reports sustained good outcomes with PRP at a mean follow-up of over 3 years [37].
There are also two studies comparing PRP injections with open surgical debridement as described many years ago by Nirschl. Ford et al. found no difference in pain relief between these two procedures with a mean follow-up of 315 days for PRP patients and 352 for surgical patients. He has also reported similar return to work rates between the groups [34]. In contrast, better effects with PRP injections were described by Karaduman et al. who reported that even up to 1-year follow-up, TE patients had less pain, higher Mayo Elbow Scores, and stronger grip than those who underwent the Nirschl procedure [38]. The same findings for short and midterm follow-up were found when PRP was compared with arthroscopic TE release. However, improvement after arthroscopic surgical treatment resulted in sustained pain relief with better results for grip strength in more than 2 years follow-up compared to PRP [39]. In a meta-analysis of randomized controlled trials, Fitzpatrick et al. evaluated the outcomes of the PRP groups by preparation method and injection technique in tendinopathy. The aim of this study was to determine the clinical effectiveness of the preparations and to evaluate the effect of controls used in the studies reviewed. Among the results of PRP group good evidence has been found to support the use of a single injection of LR-PRP under ultrasound guidance in tendinopathy over what? [40].
Golfer’s Elbow
Medial epicondylitis is similar to its lateral counterpart, though less common. Often referred to as “golfer’s elbow” (GE), its incidence is estimated as 1% in a general population [41, 42]. As for TE, a variety of possible treatments have been described in the literature, with no consensus on the ultimate algorithm [43]. However, though it is a well-recognized condition, there is a paucity of studies about PRP administration in GE patients. Varshney et al. published a study in which 83 patients with elbow epicondylitis (63 with TE and 20 with ME) were randomly allocated into two groups: (A) 53 patients treated with corticosteroid injection and (B) 33 patients treated with PRP. He reported 91% improvement in VAS pain score 6 months after PRP injection versus 42.2% in steroid injection group. The major limitation of this study was the lack of reporting separate results for TE and GE. [44]. Tylor and Hannafin suggested that PRP injection may be beneficial for GE, but lack of studies make it difficult to fully assess its utility [45]. This may be the reason why Donaldson et al., who published a treatment algorithm for GE, do not even mention PRP as a treatment modality in their approach [46].
Ulnar Collateral Ligament Pathology
Ulnar collateral ligament (UCL) insufficiency remains a career-threatening injury for overhead athletes, especially baseball players [47]. A standard conservative treatment protocol that includes physiotherapy and activity modification is reported to be successful in about 42% of cases [48]. Therefore, PRP has gained attention as a possible way of augmenting the conservative treatment of UCL pathology. Dines et al. published outcomes of treatment with PRP injections on 44 baseball players (6 professional athletes) who failed initial conservative treatment. There were 36 pitchers and 8 position players in this study. Thirty-four percent of 44 players had an excellent outcome. Among position players, 4 had an excellent outcome, 3 good outcome, and 1 had a poor outcome. Sixty-seven percent of professional players were capable of returning to play after PRP injection. Generally, in this study, 73% players had a good to excellent outcomes with PRP injection. However, 10 out of 44 patients had poor and 2 had fair outcomes. Interestingly, 100% poor outcomes were observed in patients with distal ligament rupture. They suggested that this treatment may beneficial in young athletes with partial tears who sustain acute trauma [47]. The results of PRP-augmented conservative therapy was also reported by Podesta et al. The authors noted a decrease of medial valgus gapping and return to sport rate of 88% at 12 weeks after treatment of 34 athletes with partial UCL tears. [49]. PRP treatment in partial UCL tears was also evaluated by Deal et al., who included 25 athletes (23 baseball players and 2 softball players). They found that with 2 injections of leukocyte-rich PRP, 96% demonstrated UCL stability 2 weeks after the second injection. Worse results were achieved in patients who underwent previous UCL surgery [50]. Interestingly, a survey of American Shoulder and Elbow members revealed that only 36% of questioned physicians reported using PRP in UCL injuries, and only 16.6% of respondents claimed to use leukocyte-rich PRP [51].
Distal Biceps Pathology
Distal biceps degeneration is not a common reason for elbow pain. Its description includes pain with elbow flexion and/or supination with a present of intact biceps tendon. Little data exists in examining the results of PRP injection to distal biceps pathology. A small cohort of 6 patients treated with ultrasound guided PRP injections and evaluated with MRI was reported by Barker et al. The mean modified Mayo Elbow Performance Score improved significantly from 68.3 points to 95 points at the mean follow-up of 16 months. Decrease in VAS pain score has also been noted in this cohort and all patients claimed willingness to have another injection if needed. This study has however a major limitation, which is lack of control group [52]. A bigger cohort has been observed by Sanli et al. They also reported significant improvements in VAS pain scores, from median 8 to median 2.5 for active movements. Elbow functional assessment scores also reached significant improvement, reporting a 56% increase in strength. Interestingly, on median follow-up of 47 months, no recurrence of symptoms was observed [53].
Distal Triceps Pathology
We found only one case report of a 47-year-old male with a partial distal triceps tendon rupture who was treated with PRP injection and consecutive physiotherapy. On reexamination, performed 2 weeks after injection and before a course of physiotherapy, a decrease of pain was noted. At 4 weeks after injection, an increase in strength with elbow extension was noted from 3/5 to 4/5 [54]. Given the incidental report and no control, it is hard to recommend injection at this time for a standard treatment in distal triceps pathology. However, growing interest in biologic treatment may provide further study in the future.
Conclusions
Interest in biologic treatments of soft tissue pathologies has increased over the last several decades. The number of published studies on PRP has exceed 14,000 in PubMed and there is still no consensus on whether it should be employed in soft tissue pathology management or not. The methodological challenges regarding concentration, preparation, and activation continue to limit the ability to draw definitive conclusions from the literature.
Regarding elbow pathologies, PRP injection in tennis elbow seems to be the best-studied intervention. However, although numerous original studies suggest potential benefit of PRP, especially when compared to steroid injections, available systematic reviews and meta-analyses leave the physician with inconclusive evidence. Therefore, not only more studies on larger cohorts and with longer follow-up are required but also standardization in the method of preparing PRP, deciding on leukocyte-rich or leukocyte-poor preparations, PRP with or without activation, and uniformity in pain and function evaluation scores are some of the areas which need to be agreed upon by collaborating international working groups before meaningful recommendations can be made regarding the efficacy of PRP.
Incidental reporting of treating other than TE elbow conditions makes it impossible to make a recommendation either for or against PRP. Therefore, we suggested caution in discussing this possibility with patients.
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Dr. Randelli is a consultant for Arthrex, Depuy, Microport, and Medacta. He is president of Sigascot Italian Nat Soc Arthroscopy. All other authors declare no conflicts of interest.
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Kwapisz, A., Prabhakar, S., Compagnoni, R. et al. Platelet-Rich Plasma for Elbow Pathologies: a Descriptive Review of Current Literature. Curr Rev Musculoskelet Med 11, 598–606 (2018). https://doi.org/10.1007/s12178-018-9520-1
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DOI: https://doi.org/10.1007/s12178-018-9520-1