Limb length inequality: clinical implications for assessment and intervention

Area of Science:

• Orthopedics
• Biomechanics
• Physical Therapy

Background:

• Limb length inequality (LLI) is a common condition with varied etiological factors.
• Accurate assessment and effective intervention strategies for LLI remain subjects of debate.
• The relationship between LLI and other musculoskeletal conditions, such as low back pain (LBP), is an area of ongoing research.

Purpose of the Study:

• To review existing literature on adult limb length inequalities.
• To provide evidence-based recommendations for the assessment and intervention of LLI.
• To synthesize clinical experience with literature findings for practical guidance.

Main Methods:

• Comprehensive literature searches were conducted in MEDLINE, PubMed, and CINAHL databases.
• Review and synthesis of studies on LLI classification, etiology, assessment techniques, and interventions.
• Analysis of evidence supporting the link between LLI and orthopaedic pathologies and LBP.

Main Results:

• Little consensus exists on LLI prevalence, clinical significance thresholds, and assessment method validity.
• Correlational studies show a questionable link between LLI and general orthopaedic pathologies.
• Intervention studies provide stronger support for a link between LLI and low back pain (LBP).
• Clinical assessment via palpation of pelvic landmarks with block correction shows the most support.
• Radiological methods, specifically standing radiographs, are recommended when clinical assessment is inconclusive.

Conclusions:

• Clinical assessment of LLI using pelvic landmark palpation is recommended.
• Intervention for LLI less than 5 mm identified clinically requires cautious consideration.
• Shoe inserts or lifts are suitable for mild LLI, while surgery may be indicated for severe cases.