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作者：Nancy Fowler Larson  
出處：WebMD醫學新聞

　　January 12, 2010 — 根據一項發表於1月13日美國醫學會期刊（JAMA）的研究結果，相較於安慰劑，注射富含血小板的血漿（PRP），一種熱門的慢性阿基里斯腱疾患或是肌腱病變治療方式，顯然無法降低疼痛或增加運動活性。
　　
　　荷蘭鹿特丹Erasmus大學醫學中心的Robert J. de Vos醫師與其同事們寫到，最近三項綜論報告使用PRP於肌腱病變的效果卓越，儘管這些結論是根據實驗室研究，以及有重要限制的臨床研究。雖然我們沒有有關使用這個治療方法的盛行率數據，但最近發表的兩項綜論指出注射PRP治療肌腱病變在臨床上越來越常見。
　　
　　阿基里斯跟腱部位以及其他部位的疾患，佔所有運動傷害的30%至50%，它會導致長時間無法運動，且經常干擾日常生活。
　　
　　這項雙盲、隨機分派、安慰劑控制研究合併PRP與安慰劑注射生理食鹽水，配合離心運動。研究對象是54位年齡介於18~79歲的病患，這些病患在2008年8月到2009年1月之間於荷蘭萊岑丹Antoniushove Hague醫學中心就診，罹患中段阿基里斯腱肌腱病變。他們採用一種問卷（Victorian Institute of Sports Assessment-Achilles[VISA-A]）來評估試驗開始時，以及第6、12與24週時的疼痛與運動活性。
　　
　　根據過去的研究來進行預測，作者們假設PRP組的VISA-A分數比安慰劑組高12分。然而，他們的發現並非如此。
　　
　　24週後的研究結果顯示，在PRP組，VISA-A平均分數改善了21.7分（95%信賴區間[CI]為13.0-30.5）。安慰劑組的分數增加了20.5分（95% CI為11.6-29.4）。在校正變項後，包括試驗前VISA-A分數（P=0.03）、以及症狀時程（P=0.06），在任一測量期間，兩組之間都沒有顯著差異。組與組之間的變異數在6週時為2.5（95% CI為-6.9-11.9）、12週時為-1.6（95% CI為-11.9-8.7）、而在24週時為-0.9（95% CI為-12.4-10.6）。正面值代表偏好PRP組。
　　
　　除此之外，次級預後方面同樣沒有顯著差異。這些包括病患主觀滿意度（在24週後為-4.1%；95% CI為-25.8%-17.7%），以及可從事運動的病患數目（在24週後為1.4%；95% CI為-17.0%-19.8%）。再次地，正面值代表偏好PRP組。運動與耐受性在兩組之間都沒有顯著差異。
　　
　　作者們寫到，在我們的研究中，有關兩個治療組何以表現出臨床惡化的原因仍然不明。在過去的臨床研究中，離心運動已經被證實是有效的。
　　
　　試驗作者表示有兩個重要限制：一是無法建立注射PRP的血小板與活化型生長因子數目、以及缺乏接受PRP注射且未進行離心運動組別，使得這項研究無法確認對PRP治療的負面效應。
　　
　　作者們建議，需要進一步針對處理肌腱病變進行研究，這個疾病過去被稱為肌腱炎。他們也表示，尋找非使用注射方式治療的重要性。
　　
　　作者們寫到，保守治療是令人失望的，且25%~45%患者最終需要外科手術。因此，改善保守治療有其必要性。
　　
　　Biomet生技公司LLC贊助這項研究。研究作者們表示已無相關資金上的往來。


Trendy Chronic Achilles Tendon Injury Therapy Is Ineffective

By Nancy Fowler Larson
Medscape Medical News

January 12, 2010 — Injections of platelet-rich plasma (PRP), an up-and-coming treatment for chronic Achilles tendon disorder, or tendinopathy, does not appear to reduce pain or increase activity more than placebo, according to a study published in the January 13 issue of the Journal of the American Medical Association.

"Three recent reviews reported promising results of the use of PRP in tendinopathy, although these conclusions were based on laboratory studies and on clinical studies with important limitations," write Robert J. de Vos, MD, from the Department of Orthopedics, Erasmus University Medical Center, Rotterdam, the Netherlands, and colleagues. "Although we are unaware of published data on the prevalence of use of this therapy, 2 recent reviews have suggested that PRP injections for tendinopathy are increasingly used in the clinical setting."

Tendon disorders in the Achilles heel and other locations make up 30% to 50% of all sports injuries, can lead to long interruptions in sports participation, and often interfere with daily life.

This double-blind, block randomized, placebo-controlled trial combined both PRP and placebo saline injections with eccentric exercises. Researchers studied 54 patients, ages 18 to 79 years, who had midportion Achilles tendinopathy at The Hague Medical Center Antoniushove, Leidschendam, the Netherlands, between August 2008 and January 2009. They employed a questionnaire (Victorian Institute of Sports Assessment-Achilles [VISA-A]) to measure pain and activity at the study's onset and at 6, 12, and 24 weeks.

Making a prediction based on previous studies, the authors hypothesized that the VISA-A score of the PRP group would be 12 points higher than that of the placebo group. However, their findings proved otherwise.

Results after 24 weeks showed that for the PRP group, the mean VISA-A score improved by 21.7 points (95% confidence interval [CI], 13.0 - 30.5). The placebo group's score increased by 20.5 points (95% CI, 11.6 - 29.4). After adjustment for variables, including the baseline VISA-A score (P = .03) and duration of symptoms (P = .06), there was no significant distinction between the 2 groups during any measurement period. Between-group variations were 2.5 (95% CI, ?6.9 to 11.9) at 6 weeks, ?1.6 (95% CI, ?11.9 to 8.7) at 12 weeks, and ?0.9 (95% CI, ?12.4 to 10.6) at 24 weeks. Positive values favor the PRP group.

Furthermore, no significant differences were seen in secondary outcome measures. These include subjective patient satisfaction (after 24 weeks, ?4.1%; 95% CI, ?25.8% to 17.7%) and the number of patients returning to their sport (after 24 weeks, 1.4%; 95% CI, ?17.0% to 19.8%). Again, positive values favor the PRP group. Neither were there any important differences between the groups in terms of exercise compliance.

"The reason why both treatment groups show clinical progression in our study, but also in other studies on PRP, is likely due to the fact that exercises were performed. Eccentric exercises have been shown to be effective in previous randomized trials," the authors write.

The study authors reported 2 limitations: numbers could not be established for the amount of platelets and activated growth factors in the PRP injections, and the absence of a group receiving PRP injection but no eccentric exercises prohibited the study from determining whether exercise actually has a negative effect on PRP therapy.

The authors recommended further investigation of injections to remedy tendinopathy, formerly known as tendinitis. They also noted the importance of finding effective treatments that do not involve injections.

"Conservative treatment is disappointing and 25% to 45% of patients eventually require surgery," the authors write. "There is a clear need for improved conservative therapy."

Biomet Biologics LLC supported the study. The study authors have disclosed no relevant financial relationships.

JAMA. 2010;303(2):144-149.