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Fig. 5 | BMC Musculoskeletal Disorders

Fig. 5

From: Biomechanical analysis of reduction technique for lumbar spondylolisthesis: anterior lever versus posterior lever reduction method

Fig. 5

Mechanical free body diagrams of both reduction methods. The lever arm of anterior lever reduction is greater than the posterior reduction method(L > L-BCL-(BL)/2); therefore, the force required to achieve reduction is lesser (ARF < PRF). a Anterior lever reduction involves a class 2 lever; b Posterior lever reduction involves a class 1 lever. ARF, anterior reduction force; PRF, posterior reduction force; RF, resistance force; L: Cobb length; BL: body length; BCL: L4 body center length

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BMC Musculoskeletal Disorders

ISSN: 1471-2474

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