Both PRP and CS injections are effective treatments for patients with LE. CS provides better short-term (<2 months) functional improvement and may be more advantageous in terms of short-term pain relief, while PRP provides better long-term (≥6 months) functional improvement and better performance regarding long-term pain relief.

Corticosteroid injections alleviated symptoms of LET (tennis elbow) 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.

Use of PRP in the treatment of UCL insufficiency produced outcomes much better than earlier reported outcomes of conservative treatment of these injuries. PRP injections may be particularly beneficial in young athletes who have sustained acute damage to an isolated part of the ligament and in athletes unwilling or unable to undergo the extended rehabilitation required after surgical reconstruction of the ligament. 

UCL INJURY CASE REPORT: A 14-year-old adolescent throwing athlete, a right-handed pitcher, presented with chronic right medial elbow pain discovered to be secondary to a partial UCL tear, as identified on both ultrasound and magnetic resonance imaging. A single ultrasound-guided injection of PRP to the pathologic site of the partial UCL tear, in concert with our standardized rehabilitation protocol for throwing athletes after UCL injuries, enabled the boy to heal and return to throwing at full pitching distance without pain and without complications. This emphasizes the utility of PRP as a regenerative treatment option in an adolescent throwing athlete. 

BICEPS DISTAL: Six patients with clinical and radiological evidence of distal biceps tendinopathy underwent ultrasound-guided platelet-rich plasma (PRP) injection. The Mayo Elbow Performance Score improved from 68.3 (range 65 to 85) (fair function) to 95 (range 85 to 100) (excellent function). The VAS at rest improved from a mean of 2.25 (range 2 to 5) pre-injection to 0. The VAS with movement improved from a mean of 7.25 (range 5 to 8) pre-injection to 1.3 (range 0 to 2). Ultrasound-guided PRP injection appears to be a safe and effective treatment for recalcitrant cases of distal biceps tendinopathy. 

TRICEPS CASE REPORT: This case report presents the rehabilitation strategy used following a PRP injection for a patient with a partially torn distal triceps tendon who previously failed physical therapy interventions. The patient returned to light weight training and coaching activity after completing 15 visits over a 3 month period. One month after discharge, the patient reported pain-free activities of daily living and a return to previously performed gym activities.