Pedicle Subtraction Osteotomy Construct Optimization: A Cadaveric Study of Various Multirod and Interbody Configurations

Study Design.

Fourteen cadaveric specimens were separated into two groups: (1) L3 pedicle subtraction osteotomy (PSO) with transforaminal lumbar interbody fusion (TLIF) or (2) lateral lumbar interbody fusion (LLIF). A 2-rod configuration (2R) was compared with two supplemental rod configurations: 4-rod (4R) with accessory rods (ARs) using connectors or 4R with satellite rods (SRs) without connectors.

Objective.

Compare PSO constructs with different rod configurations and adjacent-level interbody support.

Summary of Background Data.

Supplemental rods and anterior column support enhance biomechanical performance.

Methods.

Pure moments were applied in (1) intact, (2) pedicle screws and rods, (3) PSO + 2R, (4) 4R AR, and (5) 4R SR conditions. Primary and supplemental rods had strain gauges across the index level. Sacral screw bending moments and range of motion (ROM) were recorded.

Results.

For TLIF, AR decreased ROM during flexion (P = 0.02) and extension (P 

Source: Spine - April 15, 2022 Category: Orthopaedics Tags: BIOMECHANICS Source Type: research