Rehabilitation for Base of Thumb Avulsion Fracture

Initial Management

For a base of thumb avulsion fracture, rehabilitation should follow a structured protocol starting with 3-6 weeks of rigid immobilization in a thumb spica cast or splint, followed by progressive rehabilitation phases including range of motion exercises, strengthening, and a gradual return-to-throwing program, as recommended by the American Academy of Orthopaedic Surgeons 1
Immobilization with a thumb spica cast or splint for 3-6 weeks is the first step for minimally displaced fractures, according to the American Academy of Orthopaedic Surgeons 1
Follow-up radiographs should be obtained at 10-14 days to ensure the fracture position is maintained, as suggested by the American Academy of Orthopaedic Surgeons 1
For fractures with >3mm displacement or involving more than one-third of the articular surface, surgical management should be considered before rehabilitation begins, as recommended by the American Academy of Orthopaedic Surgeons 1

Begin with cryotherapy to reduce pain and inflammation, and initiate gentle thumb and wrist range of motion exercises as pain allows, as recommended by the American Medical Society for Sports Medicine 2
Start with passive range of motion before progressing to active-assisted and then active range of motion, according to the American Medical Society for Sports Medicine 3
Focus on flexibility and stretching of the posterior thumb muscles, as suggested by the American Medical Society for Sports Medicine 2
No throwing activities during the acute phase, as recommended by the American Medical Society for Sports Medicine 2
Continue with stretching exercises, focusing on thumb internal rotation and horizontal adduction, and begin progressive isotonic strengthening of the thumb and wrist, as recommended by the American Medical Society for Sports Medicine 2
Initiate core and lower extremity strengthening to support the kinetic chain, according to the American Medical Society for Sports Medicine 2
Custom-made thermoplast or neoprene orthoses may be beneficial for symptom relief during activities, as suggested by the American Academy of Orthopaedic Surgeons 4

Progress throwing program as tolerated, following age-appropriate pitch count guidelines, as recommended by the American Sports Medicine Institute 6
For 9-10 year olds, limit to 75 pitches/week and 2000 pitches/year, according to the American Sports Medicine Institute 6
Implement proper catching techniques to minimize stress on the thumb, as suggested by the American Medical Society for Sports Medicine 5
Monitor for signs of pain or discomfort which may indicate need to modify activity, as recommended by the American Medical Society for Sports Medicine 7

Avoid playing catcher position immediately after being removed from pitching, as recommended by the American Medical Society for Sports Medicine 5
Implement a 3-month rest period from throwing each year to prevent overuse injuries, according to the American Medical Society for Sports Medicine 5
Ensure proper equipment fit, particularly the catcher's mitt, to reduce stress on the thumb, as suggested by the American Sports Medicine Institute 6
Emphasize proper catching technique to minimize impact forces on the thumb, as recommended by the American Sports Medicine Institute 6