Lower limb length and offset in total hip arthroplasty.

Area of Science:

• Orthopedic Surgery
• Biomedical Engineering
• Reconstructive Surgery

Background:

• Restoring normal hip biomechanics is essential for functional recovery after total hip arthroplasty (THA).
• Limb length equality and hip/femoral offset are critical considerations in THA, impacting patient satisfaction and prosthesis survival.
• Accurate management of limb length and offset is vital to prevent adverse effects on function, quality of life, and prosthetic longevity.

Purpose of the Study:

• To define anatomic and functional limb length discrepancies and femoral/hip offset, considering femoral anteversion.
• To review the influence of operated limb length and offset on patient satisfaction, hip function, and prosthesis survival after THA.
• To highlight common errors in length and offset management and their consequences.

Main Methods:

• Review of data on the impact of limb length and offset on THA outcomes.
• Discussion of traditional surgical planning methods (preoperative templating, intraoperative landmarks).
• Exploration of advanced technologies like computer-assisted surgery and the EOS imaging system for improved accuracy.

Main Results:

• Errors in limb length and hip offset can negatively affect patient outcomes, including function, quality of life, and prosthesis survival.
• Modern prosthetic options (varus-aligned, lateralized implants, modular/custom necks) aid in restoring hip geometry, especially in cases of coxa vara/valga.
• Attention to femoral anteversion is also critical for successful THA outcomes.

Conclusions:

• Meticulous attention to limb length and hip offset is paramount in total hip arthroplasty to optimize patient function and implant survival.
• Advanced imaging and planning tools enhance surgical accuracy in managing hip geometry.
• Revision arthroplasty may be indicated for symptomatic errors in limb length or offset.