Impact of lifestyle and clinical factors on the prognosis of tennis elbow.

Tennis elbow (lateral epicondylitis) typically responds well to conservative treatment, and few patients require surgical intervention. This study aimed to investigate the influence of lifestyle and clinical factors on the prognosis of tennis elbow. This prospective, multicenter, nested case-control study included patients diagnosed with lateral epicondylitis after excluding other conditions. Patients who required surgery because of inadequate improvement after 6 months of conservative treatment were defined as the case group; the remaining patients constituted the control group. Propensity score matching was performed to eliminate baseline differences. Univariate and multivariate analyses were performed using logistic regression. This study included 265 patients (53 in the case group, 212 in the control group). Multivariate analysis revealed that smoking, alcohol consumption, and frequent physical exercise were independent risk factors for surgical intervention, whereas combined treatment with oral nonsteroidal anti-inflammatory drugs (NSAIDs) and local corticosteroid injections was a protective factor against surgery. Subgroup analysis showed that heavy drinkers had a 3.74-fold higher risk of requiring surgical treatment within 1 year than occasional drinkers. Smoking and alcohol consumption were associated with non-operative treatment failure in patients with lateral epicondylitis. Combining oral NSAIDs and corticosteroid injections is a favorable conservative treatment option.

Clinical and Ultrasonographic Effectiveness of Two Different Splints Used for the Treatment of Lateral Epicondylitis: A Prospective Randomized Controlled Study.

OBJECTIVE: This study compares the clinical and ultrasonographic efficacy of 2 splint types, the lateral epicondylitis band (LEB) and the wrist extensor splint (WES), for treatment of lateral epicondylitis (LE). DESIGN: Randomized controlled single-blind trial. SETTING: Outpatient clinic. PARTICIPANTS: 159 participants diagnosed with unilateral LE based on clinical and ultrasonographic findings, and 2-12 weeks from symptom onset, were included (N=159). INTERVENTIONS: One group received joint-protection education-only (wait-and-see), while the other 2 groups were fit with splints: one the LEB and the other the WES. Both splint groups received joint-protection education. MAIN OUTCOME MEASURES: The primary outcome measure was the Patient-Rated Tennis Elbow Evaluation (PRTEE) questionnaire. Secondary outcome measures were the Visual Analog Scale (VAS) for pain, hand grip strength by dynamometry, algometric measurements, patient satisfaction, and selected ultrasonographic parameters (maximum tendon thickness measurements (MTTM) in the capitellar-radiocapitellar region and total ultrasonography scale score [TUSS]). All outcomes were assessed at baseline, 3-weeks, and 6-weeks post intervention initiation. RESULTS: Participants' mean age was 46.85±8.63 years. Of the participants, 40.88% (n=65) were male and 59.12% (n=94) were female. The baseline median (1Q-3Q) values of PRTEE-total scores were 58.5 (51-68) for the LEB, 63.5 (56.25-70.25) for the WES and 57 (48-68) for the education-only groups. At 6-weeks, the PRTEE-total scores had decreased by 44 points for those randomized to the LEB, 46 points to the WES and 7 points in the education-only groups(P<.001). While the LEB and WES approaches were superior to the wait-and-see approach in algometric measurements, VAS, and PRTEE scores (P<.05), no significant changes were found in MTTM and TUSS values. The LEB group was superior to the WES group in hand grip strength and patient satisfaction (P<.05). CONCLUSION: Using either splint for 6 weeks can be considered effective for the relief of pain and increased functionality in persons with subacute LE, although the LEB had a more positive effect on grip strength and patient satisfaction than the WES.

Is Ultrasound (US)-Guided Platelet-Rich Plasma Injection More Efficacious as a Treatment Modality for Lateral Elbow Tendinopathy Than US-Guided Steroid Injection?: A Prospective Triple-Blinded Study with Midterm Follow-up.

Background: Lateral elbow tendinopathy (LET) has an array of modalities described for its management. The present study analyzed two modalities used for managing the condition. Methods: The present study included 64 non-athletes with LET who failed conservative treatment that included avoiding strenuous activities, ice-fomentation, non-steroidal anti-inflammatory drugs, bracing, and physiotherapy for 6 months. A random allocation of the participants was done, with one group injected with platelet-rich plasma (PRP) and the other group with corticosteroids. The procedure was performed by the same blinded orthopedic surgeon after localizing the pathology using ultrasound. Visual analog scale (VAS) scores, disabilities of the arm, shoulder and hand (DASH) scores, Patient-Rated Tennis Elbow Evaluation (PRTEE) scores, and handgrip strengths were recorded by blinded observers other than the surgeon administering the injection. Results: The average age of the patients was 40 years. The mean VAS score at the latest follow-up of 2 years in the PRP group was 1.25 and it was significantly better than the score of 3.68 in the steroid group (p < 0.001). The mean DASH score at the latest follow-up of 2 years in the PRP group was 4.00 and it was significantly better than the score of 7.43 in the steroid group (p < 0.001). The mean PRTEE score at the latest follow-up of 2 years in the PRP group was 3.96 and it was significantly better than the score of 7.53 in the steroid group (p < 0.001). The scores were better in the steroid group at a short-term follow-up of 3 months (p < 0.05), while they were better in the PRP group at a long-term follow-up of 2 years (p < 0.05). Hand-grip strength was comparable in the PRP group (84.43 kg force) and steroid group (76.71 kg force) at the end of the 2-year follow-up with no statistically significant difference (p = 0.149). Conclusions: Corticosteroid injections alleviated symptoms of LET over short-term follow-up providing quicker symptomatic relief; however, the effect faded off over the long term. PRP injections provided a more gradual but sustained improvement over the long-term follow-up, indicating the biological healing potential of PRP.

Effect of Repetitive Corticosteroid Injection on Tennis Elbow Surgery.

BACKGROUND: Lateral epicondylitis is a chronic tendinopathy of humeral origin of the common extensor tendon. Most patients show improvement after nonoperative treatment. However, 4% to 11% of patients require surgical treatment. Although corticosteroid injection is one of the most commonly applied nonoperative treatment methods, to the authors' knowledge, no study has reported the effect of the number of preoperative corticosteroid injections on the final postoperative outcome. Thus, the objective of this study was to determine the effect of the number of preoperative corticosteroid injections on postoperative clinical outcomes. HYPOTHESIS: The number of corticosteroid injections before surgical treatment does not affect postoperative clinical outcomes. STUDY DESIGN: Case series; Level of evidence, 4. METHODS: As a retrospective review, from January 2007 to December 2019, a total of 99 patients who had undergone surgical treatment of lateral epicondylitis with a modified Nirschl technique were enrolled. The number of preoperative corticosteroid injections was investigated by medical record review. Outcome measurements included visual analog pain scale; Disabilities of the Arm, Shoulder and Hand (DASH) score; Mayo Elbow Performance Score; and the Nirschl and Pettrone grade. Grip power and wrist extension power were measured using a digital dynamometer. RESULTS: A total of 99 patients were included in this study. The mean total number of injections of patients was 4.37 ± 2.46 times (range, 1-15 times). Total duration of nonoperative treatment before surgery was 25.4 ± 20.5 months (range, 4-124.8 months). The mean postoperative follow-up period was 42.8 ± 28.0 months (range, 12-110 months). For all injection numbers, clinical scores showed significant improvement in visual analog pain scale, DASH score, Mayo elbow score, grip power, and wrist extension power after surgery. Regression analysis showed that the degree of improvement according to the injection number was not statistically significant. The Nirschl and Pettrone grade was excellent in 82 (82.8%) patients, good in 14 (14.1%) patients, fair in 2 (2%) patient, and failure in 1 (1%) patient. CONCLUSION: The number of preoperative corticosteroid injections does not appear to affect postoperative clinical outcomes of patients with lateral epicondylitis who undergo surgery with a modified Nirschl technique.

Corticosteroid injections for the treatment of lateral epicondylitis are superior to platelet-rich plasma at 1 month but platelet-rich plasma is more effective at 6 months: an updated systematic review and meta-analysis of level 1 and 2 studies.

BACKGROUND: The purpose of this study was to perform a systematic review and meta-analysis of studies comparing local injections of either platelet-rich plasma (PRP) or corticosteroid for the treatment of lateral elbow epicondylitis. METHODS: A systematic review of MEDLINE, Embase, Scopus, and Google Scholar was performed, and all level 1 and 2 randomized studies from 2000 to 2022 were included. Clinical symptoms, patient perceived outcomes, and pain were assessed by the DASH (disabilities of the arm, shoulder and hand questionnaire) and pain by the visual analog scale (VAS). Publication bias and risk of bias were assessed using the Cochrane Collaboration's tools. The modified Coleman Methodology Score (CMS) and the GRADE system were used to assess the quality of the body of evidence. Heterogeneity was assessed using χ2 and I2 statistics. RESULTS: Thirteen studies were included in the analysis. Five studies had a high risk of bias, and the risk of bias across studies was assessed as unclear. There was no publication bias identified. Two of the four GRADE domains (inconsistency of results, imprecision of results) were downgraded to low quality, and the final GRADE assessment was downgraded to a low quality of evidence. The mean CMS score was 62.8, indicating fair quality. The pooled estimate for VAS at 1 month favored corticosteroids (P = .75) but favored PRP at three (P = .003) and six months (P = .0001). The pooled estimate for the DASH score favored corticosteroids at 1 month (P = .028) but favored PRP at three (P = .01) and six months (P = .107) CONCLUSION: The results of this meta-analysis suggest that PRP has no advantage over steroid injections within the first month of treatment, but that it is superior to steroids at both 3 and 6 months. These results also suggest that corticosteroids have a short-term beneficial effect during the early treatment period, although the quality of the available evidence is not very robust in support of this finding. However, these findings must all be viewed with caution as the high risk of bias and moderate to low quality of the included studies may not justify a recommendation of one treatment over another.

Standardised Tendon Fenestration with ITEC-Technique for Lateral Epicondylosis with Injection of Betamethasone versus Autologous Blood.

Background: Infiltration is one of the treatment options for lateral epicondylosis, a degenerative process in the tendon of the musculus extensor carpi radialis brevis. The aim of this study was to evaluate the clinical outcome of a standardised fenestration technique, the Instant Tennis Elbow Cure (ITEC) technique, with injection of betamethasone versus autologous blood. Methods: A prospective comparative study was performed. Twenty-eight patients received an infiltration with 1 mL betamethasone, in combination with 1 mL 2% lidocaine. Twenty-eight patients received an infiltration with 2 mL autologous blood. Both infiltrations were administered using the ITEC-technique. The patients were evaluated at baseline, 6 weeks, 3 months and 6 months using Visual Analogue Scale (VAS), Patient-Rated Tennis Elbow Evaluation (PRTEE) and Nirschl staging. Results: At the 6-week follow-up, the corticosteroid group showed significantly better results for VAS. At the 3-month follow-up, no significant differences were observed for all three scores. At the 6-monthfollow-up, the autologous blood group showed significantly better results for all three scores. Conclusions: Standardised fenestration using the ITEC-technique with corticosteroid infiltration is more effective in reducing pain at the 6-week follow-up. At the 6-month follow-up, the use of autologous blood is more effective in pain reduction and functional recovery. Level of Evidence: Level II.

Is Low-Dose Dextrose Prolotherapy as Effective as High-Dose Dextrose Prolotherapy in the Treatment of Lateral Epicondylitis? A Double-Blind, Ultrasound Guided, Randomized Controlled Study.

OBJECTIVES: To investigate the effects of prolotherapy (PrT) on pain, functionality, clinical improvement and to compare the 5% low and 15% high dose dextrose PrT in chronic lateral epicondylitis. DESIGN: A double-blind, parallel groups, randomized controlled study. SETTINGS: Outpatient Clinic. PARTICIPANTS: Sixty patients (N=60), aged 44.30±10.31 years old, with chronic lateral epicondylitis were allocated randomly into 3 groups. INTERVENTIONS: To Group 1 5% dextrose PrT, to Group 2 15% dextrose PrT, to Group 3 0.9% saline injections were done at 3 times (weeks 0, 3, 6), to the entheses of forearm extensors and annular ligament. MAIN OUTCOME MEASURES: The primary outcomes were handgrip strength, visual analog scale-rest (VAS-R), visual analog scale-activity (VAS-A), pressure-pain threshold, and Quick Disability of the Arm, Shoulder and Hand (Q-DASH). The secondary outcomes were clinical improvement (Disease Global Assessment Questionnaire), side effects, and complications. Primary outcomes were collected at baseline week 0, week 3, and 12. Secondary outcomes were collected at weeks 3 and 12. RESULTS: In Group 2, VAS-A and VAS-R (at week 3), handgrip strength and pressure-pain threshold (at week 12) were significantly different than other groups (P<.05). In Groups 1 and 2, there was a difference in primary outcomes at week 12 than baseline (P<.05). In Group 3, there was no difference in VAS-R, VAS-A, and handgrip strength at weeks 3 and 12 than baseline (P>.05). CONCLUSION: In chronic lateral epicondylitis, 5% and 15% dextrose PrT is more effective in pain, handgrip strength, functionality, and clinical improvement than %0.9 saline. There was no difference in functionality, clinical improvement, side effects, and complications between the PrT groups. 15% dextrose PrT was more effective in handgrip strength and pressure-pain threshold at week 12 and pain at week 3. We recommend 15% dextrose PrT based on this study.

Comparison between acupotomy and corticosteroid injection for patients diagnosed with different classifications of tennis elbow: a randomized control trial.

BACKGROUND: Tennis elbow has long been one of the most controversial subjects in orthopaedics. Many scholars thought the use of open or arthroscopic surgery was reserved for patients with refractory symptoms. Therapy with percutaneous acupotomy performed under local anaesthesia also removes degenerated tissue, releases strain, and therefore provides an alternative treatment option to surgical excision. METHODS: The aim of this single-blinded randomized control trial was to examine the long-term clinical effectiveness of a nonsurgical percutaneous release technique (acupotomy) and the current recommended treatment (steroid injection) in people diagnosed with a refractory tennis elbow. Ninety patients with refractory symptoms were included. The intervention period was 6 weeks. According to the classification, 38 patients had extra-articular tennis elbow, 36 patients had intraarticular tennis elbow, and 16 patients had mixed type tennis elbow. Forty-five patients were randomly assigned to treatment with percutaneous release by acupotomy according to their classified condition, and 45 patients were randomly assigned to treatment with steroid injection alone. The visual analogue scale (VAS), a tenderness assessment, a grip assessment, and the Nirschl staging system were used for outcome evaluation at pretreatment and the posttreatment timepoints from 12 to 48 weeks. RESULTS: During the first weeks, there were no differences observed between the groups. By 6, 24 and 48 weeks, significant differences were observed between the two groups. The acupotomy group scored significantly better in visual analogue scale score (VAS) of pain, tenderness during palpation, pain-free grip strength (PFGS) and Nirschl staging than the corticosteroid group. CONCLUSIONS: For patients with lateral epicondylitis, acupotomy is just as effective as corticosteroid injections in the short term (< 6 weeks). In the long term, acupotomy has greater efficacy and is associated with a lower rate of recurrence than corticosteroid injections in the management of lateral epicondylitis. TRIAL REGISTRATION: The National Health Commission announced the "ethical review measures for biomedical research involving people" in 2019, which was not mandatory in previous studies.

Position statement: nonoperative management of lateral epicondylitis in adults.

We sought to compare methods of nonsurgical treatment of lateral epicondylitis in men and women older than 18 years to develop a guideline intended for orthopedic surgeons and other health care providers who assess, counsel and care for these patients. We searched Medline, Embase and Cochrane through to Mar. 9, 2021, and included all English-language studies comparing nonsurgical approaches. We compared physiotherapy versus no active treatment, corticosteroids versus placebo, platelet-rich plasma (PRP) versus placebo, and autologous blood injection versus placebo. Outcomes of interest were pain outcomes (visual analogue scale scores) and functional outcomes. We rated the quality of the evidence and strength of recommendations using the Grading of Recommendations Assessment, Development, and Evaluation (GRADE) approach. This guideline will benefit patients seeking nonsurgical intervention for lateral epicondylitis by improving counselling on nonsurgical treatment options and possible outcomes. It will also benefit surgical providers by improving their knowledge of various nonsurgical approaches. Data presented could be used to develop frameworks and tools for shared decision-making.

Exploring the clinical efficacy of different nonsurgical rehabilitation interventions for humeral lateral epicondylitis: A protocol for network meta-analysis.

BACKGROUND: Lateral epicondylitis is a common musculoskeletal disorder characterized by the decreased grip and upper limb strength and pain in the lateral aspect of the elbow joint. At present, shock wave, corticosteroid injection, platelet-rich plasma injection, and Dextrose prolotherapy therapy nonsurgical rehabilitation treatment methods are commonly used in clinical. However, the conclusions of studies comparing treatment efficacy between them are controversial, with most studies focusing on limited comparisons and a lack of direct and indirect comparisons between them, making it difficult to have a clearer and more comprehensive understanding of the efficacy between them. PURPOSE: To comprehensively compare the effectiveness of shockwave, corticosteroid injection, platelet-rich plasma injection, and Dextrose prolotherapy therapy for the treatment of external humeral lateral epicondylitis using a reticulo-meta-analysis. METHODS: Randomized controlled trials on the effectiveness of shock wave, corticosteroid injection, platelet-rich plasma injection, and Dextrose prolotherapy therapy for the treatment of external humeral lateral epicondylitis were searched in PubMed, The Cochrane Library, CNKI, and Wan-Fang databases for the period January 1, 2016 to January 1, 2021 for each database. Two investigators independently screened the literature, extracted data according to inclusion and exclusion criteria, and evaluated the quality of the literature in parallel. Statistical analyses were performed using Stata 14.0 software to compare differences in efficacy between treatment measures using ratio and 95% confidence interval as effect indicators and to rank efficacy. RESULTS: Nine randomized controlled trials with a total of 289 patients with external humeral lateral epicondylitis were included, involving 4 nonsurgical rehabilitation measures and 6 intervention options. Quadrilateral ring to test the inconsistency of each closed-loop study finding, and the results show that the inconsistency factor was bounded at 1.65, with lower 95% confidence interval of 0.47 and 2.84 for both, which in summary indicates that the formation between the treatment measures in this study indicates that each closed-loop inconsistency was good. The SUCRA curve showed that platelet-rich plasma injection + shockwave was the first treatment with an area under the curve of 86.9%. Six treatment measures were ranked as follows: platelet-rich plasma injection + shockwave > platelet-rich plasma injection > shockwave > corticosteroid > corticosteroid + shockwave > prolotherapy. CONCLUSIONS: It is believed that in the course of clinical practice, platelet-rich plasma injection combined with shockwave therapy can be preferred for patients with humeral epicondylitis.

Efficacy of prolotherapy in pain control and function improvement in individuals with lateral epicondylitis: A Systematic Review and Meta-analysis.

AIM: The objective of this study was to evaluate the efficacy of prolotherapy when treating individuals with lateral epicondylitis through a systematic review and meta-analysis. METHODS: The search for articles was carried out in electronic databases including PUBMED, CENTRAL, WEB OF SCIENCE, SCIELO and Google Scholar, published up to July 2021. We used the following keywords: prolotherapy OR proliferation therapy OR hypertonic dextrose injections AND tennis elbow OR lateral epicondylitis. The effectiveness was expressed as mean difference or standardized mean difference ((d) and 95% CI). MAJOR RESULTS: Nine clinical trials that used prolotherapy in the treatment of lateral epicondylitis were included. In the pooled analysis, prolotherapy was effective in pain control in the medium (d = -0.85, 95% CI -1.29 to -0.41, p (z) 0.0001) and long terms (d = -1.05, 95% CI -2.06 to -0.03, p (z) 0.04). It was also effective in improving function in the medium term (d = -1.21, 95% CI -1.64 to -0.78, p (z) 0.00001). CONCLUSIONS: Prolotherapy was effective for reducing pain in the medium and long terms, as well as for improving function in the medium term, in individuals with lateral epicondylitis. However, the risk of bias of the studies caused that the quality of evidence was moderate; more studies with a low risk of bias are necessary to corroborate the efficacy of prolotherapy in patients with lateral epicondylitis.

Effects of Hypertonic Dextrose Injection (Prolotherapy) in Lateral Elbow Tendinosis: A Systematic Review and Meta-analysis.

OBJECTIVE: To systematically review the effectiveness of hypertonic dextrose prolotherapy (DPT) on pain intensity and physical functioning in patients with lateral elbow tendinosis (LET) compared with other active non-surgical treatments. DATA SOURCES: Systematic search of Cochrane Central Register of Controlled Trials, MEDLINE, EMBASE, Web of Science, PubMed, Dimensions, Global Health, NHS Health Technology Assessment, Allied and Complementary Medicine, and OVID nursing database from inception to June 15, 2021, without language restrictions. STUDY SELECTION: Two reviewers independently identified parallel or crossover randomized controlled trials that evaluated the effectiveness of DPT in LET. The search identified 245 records; data from 8 studies (354 patients) were included. DATA EXTRACTION: Two reviewers independently extracted data and assessed included studies. The Cochrane Risk of Bias 2 tool was used to evaluate risk of bias. The Grading of Recommendation Assessment, Development, and Evaluation approach was used to assess quality of the evidence. DATA SYNTHESIS: Pooled results favored the use of DPT in reducing tennis elbow pain intensity compared with active controls at 12 weeks postenrollment, with a standardized mean difference of -0.44 (95% confidence interval, -0.88 to -0.01, P=.04) and of moderate heterogeneity (I2=49%). Pooled results also favored the use of DPT on physical functioning compared with active controls at 12 weeks, with Disabilities of the Arm, Shoulder and Hand scores achieving a mean difference of -15.04 (95% confidence interval, -20.25 to -9.82, P<.001) and of low heterogeneity (I2=0.0%). No major related adverse events have been reported. CONCLUSIONS: DPT is superior to active controls at 12 weeks for decreasing pain intensity and functioning by margins that meet criteria for clinical relevance in the treatment of LET. Although existing studies are too small to assess rare adverse events, for patients with LET, especially those refractory to first-line treatments, DPT can be considered a nonsurgical treatment option in carefully selected patients. Further high-quality trials with comparison with other injection therapies are needed.

In vitro effect of triamcinolone and platelet-rich plasma on cytokine levels of elbow lateral epicondylitis-derived cells.

BACKGROUND: The pathogenesis and treatment of lateral elbow epicondylitis (LEE) are still controversial. The purpose of the current study was to evaluate the production of inflammatory cytokines by LEE-derived cells and to compare the anti-inflammatory effect of triamcinolone acetonide with platelet-rich plasma (PRP) on cytokines production in primary culture of these cells. METHODS: Third passage cells from primary cultures of LEE were assessed for the production of the cytokines IL-1ß, IL-6, IL-8, IL-10 and TNF-α by immune-enzymatic assay (ELISA), after the treatment with 1, 10 and 100 µM triamcinolone compared to no treated controls at the time points 6, 12, 18, 24, 48, 72 and 96 h, and to PRP at 48, 72 and 96 h. RESULTS: The cytokines IL-6 and IL-8 were produced in high concentrations by LEE cells. One, 10 and 100 µM triamcinolone induced significant decrease in the production of IL-6 and IL-8 at 48, 72 and 96 h, adding the time point 12 h for IL-8. Compared to controls, PRP caused a significant increase in the production of IL-6 and IL-8 and there was a significant increase in IL-10 production with the use of 100 µM triamcinolone at 48 h. The production of IL1-ß and TNF-α was very low and did not change when the cultures were treated with triamcinolone or PRP. CONCLUSION: LEE-derived cells produce IL-6 and IL-8, confirming the inflammatory nature of this condition. While triamcinolone inhibited the production of IL-6 and IL-8 by LEE cells, PRP induced an increase in these cytokines compared with controls.

Skin depigmentation and subcutaneous fat atrophy after crorticosteroid injection for lateral epicondylitis in two elbow.

Lateral epicondylitis is the most common elbow problem in adults. Corticosteroid injection for the treatment of lateral epicondylitis is a frequently used method of conservative management. A 43-year-old woman was referred to our clinic with a 6-month history of pain along the lateral side of her right and left elbow. She had been treated with 20 mg Triamsinolon heksasetonit to the right and left elbow for lateral epicondylitis with the resistance of pain After 3 weeks of the injection, the pain was completely relieved. The patient was able to move easily her elbow within normal limit. Examination also revealed depigmentation of the skin and atrophy of subcutaneous fat over the lateral epicondyle of both elbows. In the treatment of lateral epicondylitis, corticosteroid injection can be used for alternative conservative treatment. Depigmentation or subcutaneous tissue atrophy may occur inappropriate technique or excessive cortisone dose.

Platelet-rich plasma vs. corticosteroid injections for the treatment of recalcitrant lateral epicondylitis: a cost-effectiveness Markov decision analysis.

BACKGROUND: Both platelet-rich plasma (PRP) and corticosteroid injections may be used to treat lateral epicondylitis. We evaluated the cost-effectiveness of PRP injections vs. corticosteroid injections for the treatment of recalcitrant lateral epicondylitis. METHODS: Markov modeling was used to analyze the base-case 45-year-old patient with recalcitrant lateral epicondylitis, unresponsive to conservative measures, treated with a single injection of PRP or triamcinolone 40 mg/mL. Transition probabilities were derived from randomized controlled trials, quality-of-life (QOL) values from the Tufts University Cost-Effectiveness Analysis Registry reported using Disabilities of the Arm, Shoulder, and Hand (DASH) scores, and costs from institution financial records. Analyses were performed from health care and societal perspectives. Outcomes were incremental cost-effectiveness ratios (ICERs), reported as US dollars / quality-adjusted life-year (USDs/QALY) and net monetary benefit (NMB) to represent the values of an intervention in monetary terms. Willingness-to-pay thresholds were set at $50,000 and $100,000. Deterministic and probabilistic sensitivity analyses were performed over 10,000 iterations. RESULTS: Both PRP and triamcinolone 40-mg/mL injections were considered cost-effective interventions from a health care and societal perspective below the WTP threshold of $50,000. From a health care perspective, PRP injections were dominant compared with triamcinolone 40-mg/mL injections, with an ICER of -$5846.97/QALY. PRP injections provided an NMB of $217,863.98, whereas triamcinolone 40 mg/mL provided an NMB of $197,534.18. From a societal perspective, PRP injections were dominant compared to triamcinolone 40-mg/mL injections, with an ICER of -$9392.33/QALY. PRP injections provided an NMB of $214,820.16, whereas triamcinolone 40 mg/mL provided an NMB of $193,199.75. CONCLUSIONS: Both PRP and triamcinolone 40-mg/mL injections provided cost-effective treatments from health care and societal perspectives. Overall, PRP injections were the dominant treatment, with the greatest NMB for recalcitrant lateral epicondylitis over the time horizon of 5 years.