Bone Shortening After Amputation: A Report of Two Cases

Area of Science:

• Orthopedic surgery
• Regenerative medicine
• Biomedical engineering

Background:

• Amputation is a common surgical procedure.
• The long-term changes in bone length of residual limbs (stumps) after amputation are not well understood.
• Existing literature often assumes static bone length post-amputation.

Observation:

• Two cases of traumatic amputation (transhumeral and transtibial) were analyzed.
• Significant bone shortening was observed in both residual humerus (3.5 cm in 8 months) and tibia (1.4 cm in 72 months).
• The cases differed in amputation level, age, and time course, suggesting varied factors influencing bone remodeling.

Findings:

• Residual bone at the stump can undergo significant shortening after amputation.
• The rate and extent of bone shortening may vary based on factors like amputation site, patient age, and time elapsed post-amputation.
• This phenomenon challenges the long-held assumption of stable stump bone length.

Implications:

• Findings necessitate a re-evaluation of post-amputation stump management and prosthetic fitting.
• Further research is crucial to understand the mechanisms driving bone shortening in amputation stumps.
• This knowledge can inform the development of improved surgical techniques and rehabilitation strategies to optimize patient outcomes.