Lower extremity angular malunion: evaluation and surgical correction

Area of Science:

• Orthopedic surgery
• Biomechanics
• Lower extremity anatomy

Background:

• The lower extremity's mechanical axis is crucial for joint longevity and efficient bipedal gait.
• Loss of normal alignment due to trauma or other conditions can negatively impact long-term joint function.
• Angular malunions in healed fractures represent complex deformities affecting length, rotation, alignment, and translation.

Purpose of the Study:

• To analyze the impact of angular malunions on the lower extremity's mechanical axis and joint orientation.
• To review surgical techniques for correcting lower extremity angular malunions.
• To emphasize the importance of preoperative planning and patient selection for successful outcomes.

Main Methods:

• Consideration of all deformity facets: length, rotation, alignment, and translation.
• Analysis of the effects of malunion on mechanical axis and joint orientation.
• Review of surgical correction techniques including wedge, dome, and oblique osteotomies, and distraction osteogenesis.

Main Results:

• Angular malunions significantly alter the mechanical axis and joint orientation.
• Various surgical techniques offer solutions for different clinical scenarios.
• Successful correction depends on thorough assessment and planning.

Conclusions:

• Understanding all elements of angular malunion is key to comprehending its effects on biomechanics.
• Surgical correction methods like osteotomies and distraction osteogenesis can restore normal mechanics.
• Judicious patient selection and meticulous preoperative planning are essential for restoring optimal lower extremity function.