ISAKOS Congress 2021

2021 ISAKOS Biennial Congress Paper


Platelet-Rich Plasma Injection Reduces Tear Size In Partial Supraspinatus Tendon Tears Compared To Conventional Steroid Injection

Thanathep Tanpowpong, MD, Bangkok THAILAND
Marvin Thepsoparn, MD, Bangkok THAILAND
Somsak Kuptniratsaikul, MD, Pathumwan, Bangkok THAILAND
Thun Itthipanichpong, MD, Nonthaburi THAILAND
Danaithep Limskul, MD, Nonthaburi THAILAND
Achitpol Thongkam THAILAND
Numphung Numkarunarunrote, MD, Bangkok THAILAND
Chindarat Ratanakornphan, MD, Bangkok THAILAND
Aticha Ariyachaipanich, MD, Bangkok THAILAND
Timporn Vitoonpong, MD, Bangkok THAILAND
Phark Thanphraisan, MD, Bangkok THAILAND

Faculty of Medicine, Chulalongkorn University, Pathumwan, Bangkok, THAILAND

FDA Status Cleared


While both the PRP and the steroids can help improve functional scores, PRP injection can reduce tear size in partial supraspinatus tendon tear.


Corticosteroid (CS) injection is commonly used in partial-thickness rotator cuff tears to decrease pain. However, unwanted side effects, such as tendon rupture, could result. Alternatively, platelet-rich plasma (PRP) injection is frequently used to treat tendinopathies because it enhances healing. This study compared the differences in tear size and functional scores between intralesional PRP and subacromial CS injections.


Patients with symptomatic partial-thickness tears of the supraspinatus tendon who underwent conservative treatment for more than 3 months were enrolled. All patients underwent magnetic resonance imaging (MRI) to confirm the diagnosis. Fourteen and 15 patients received intralesional PRP and subacromial CS injections, respectively. Tears were measured in the coronal and sagittal planes. The patients underwent another MRI 6 months after the injection. Tear size was compared between the two MRI results. The American Shoulder and Elbow Surgeons Shoulder score and the Constant-Murley score were also obtained.


The demographic data were similar between the two groups. In the coronal plane, PRP and CS showed significant tear size reductions of 3.39 mm and 1.10 mm, respectively. In the sagittal plane, PRP and CS showed tear size reductions of 2.97 mm and 0.76 mm, respectively. Functional scores improved 6 months after injection in both groups, but PRP showed better functional scores than CS.


Intralesional PRP injection can reduce the tear size in partial-thickness tears of the supraspinatus tendon. Subacromial steroid injection did not affect the tear size. While CS improved functional scores compared to baseline, PRP resulted in better improvement at 6 months post-injection.

International Society of Arthroscopy, Knee Surgery and Orthopaedic Sports Medicine

567 Sycamore Valley Road W.
Danville, CA, USA 94526
Tel: +1 925.807.1197 • Fax: +1 925.807.1199