Complications of the Prone Transpsoas Lateral Lumbar Interbody Fusion for Degenerative Lumbar Spine Disease: A Multicenter Study.

BACKGROUND AND OBJECTIVES: The prone transpsoas (PTP) approach for lateral lumbar interbody fusion (LLIF) is a novel technique for degenerative lumbar spine disease. However, there is a paucity of information in the literature on the complications of this procedure, with all published data consisting of small samples. We aimed to report the intraoperative and postoperative complications of PTP in the largest study to date. METHODS: A retrospective electronic medical record review was conducted at 11 centers to identify consecutive patients who underwent LLIF through the PTP approach between January 1, 2021, and December 31, 2021. The following data were collected: intraoperative characteristics (operative time, estimated blood loss [EBL], intraoperative complications [anterior longitudinal ligament (ALL) rupture, cage subsidence, vascular and visceral injuries]), postoperative complications, and hospital stay. RESULTS: A total of 365 patients were included in the study. Among these patients, 2.2% had ALL rupture, 0.3% had cage subsidence, 0.3% had a vascular injury, 0.3% had a ureteric injury, and no other visceral injuries were reported. Mean operative time was 226.2 ± 147.9 minutes. Mean EBL was 138.4 ± 215.6 mL. Mean hospital stay was 2.7 ± 2.2 days. Postoperative complications included new sensory symptoms-8.2%, new lower extremity weakness-5.8%, wound infection-1.4%, cage subsidence-0.8%, psoas hematoma-0.5%, small bowel obstruction and ischemia-0.3%, and 90-day readmission-1.9%. CONCLUSION: In this multicenter case series, the PTP approach was well tolerated and associated with a satisfactory safety profile.

Radiographic alignment outcomes after the single-position prone transpsoas approach: a multi-institutional retrospective review of 363 cases.

OBJECTIVE: The aim of this paper was to evaluate the changes in radiographic spinopelvic parameters in a large cohort of patients undergoing the prone transpsoas approach to the lumbar spine. METHODS: A multicenter retrospective observational cohort study was performed for all patients who underwent lateral lumber interbody fusion via the single-position prone transpsoas (PTP) approach. Spinopelvic parameters from preoperative and first upright postoperative radiographs were collected, including lumbar lordosis (LL), pelvic incidence (PI), and pelvic tilt (PT). Functional indices (visual analog scale score), and patient-reported outcomes (Oswestry Disability Index) were also recorded from pre- and postoperative appointments. RESULTS: Of the 363 patients who successfully underwent the procedure, LL after fusion was 50.0° compared with 45.6° preoperatively (p < 0.001). The pelvic incidence-lumbar lordosis mismatch (PI-LL) was 10.5° preoperatively versus 2.9° postoperatively (p < 0.001). PT did not significantly change (0.2° ± 10.7°, p > 0.05). CONCLUSIONS: The PTP approach allows significant gain in lordotic augmentation, which was associated with good functional results at follow-up.

A Biomechanical Analysis of Lateral Interbody Construct and Supplemental Fixation in Adjacent-Segment Disease of the Lumbar Spine.

OBJECTIVE: To analyze the stability of lateral lumbar interbody fusion (LLIF) and compare various methods of supplemental fixation in adjacent-segment disease. METHODS: Four fresh-frozen human cadaveric lumbar spines (L1 to sacrum) were used for motion analysis in extension, flexion, and lateral bending. The L4-L5 level was secured with a lateral interbody cage and pedicle screws to simulate a fused segment. The adjacent segment (L3-L4) was evaluated with flexibility testing sequentially under the following conditions: native disc (control), LLIF cage, cage with lateral plate, pedicle screws with z-rod, and single-rod construct. The difference in mean displacement (millimeters) between groups was studied by the analysis of variance and post-hoc Tukey test. RESULTS: Mean displacement (millimeters) on averaging motion in all planes was 0.741 for native disc, 0.273 for cage, 0.183 for cage with plate, 0.086 for pedicle screws and z-rod, and 0.106 for the single-rod construct. All 4 constructs led to a significant reduction (P < 0.001) in displacement in extension and flexion, as compared with native disc. There was no demonstrable superiority between the 4 constructs as the mean displacements were not significantly different from each other. CONCLUSIONS: LLIF with and without supplemental fixation reduced motion significantly at the adjacent segment as compared with intact disc. There was a trend toward increasing rigidity with supplemental fixation (plate and pedicle screw constructs). Further biomechanical studies with larger sample sizes are needed to confirm these initial findings.

Hand Surgery Questions on the Orthopaedic In-Training Examination: Analysis of Content and Reference.

PURPOSE: To provide an updated analysis of the hand surgery section of the Orthopaedic In-Training Examination (OITE) from 2009 to 2015. The goal was to contribute to the existing literature on the analysis of OITE questions, to aid both residents and residency programs in preparation for the OITE and board examination. METHODS: The authors analyzed all OITE questions pertaining to hand surgery between 2009 and 2015. Hand questions were analyzed for category and subcategory of content, cited reference, treatment intervention, and imaging modality used. RESULTS: Hand-related questions comprised 157 of the 1,872 OITE questions (8.4%). Nine general topic areas were identified, the most common of which were fracture-dislocation, tendon/ligament, nerve, congenital, and amputation. Trends existed in the recommended references; the 5 journals and 2 textbooks that were consistently cited included the Journal of Hand Surgery (American Volume), the Journal of the American Academy of Orthopaedic Surgeons, the Journal of Bone and Joint Surgery (American Volume), the Journal of Hand Surgery (European Volume), Hand Clinics, Orthopaedic Knowledge Update, and Green's Operative Hand Surgery, respectively. CONCLUSIONS: Knowledge regarding topics and resources used for OITE hand questions could be mutually beneficial to both residents and residency programs. This information would consolidate resident OITE and board examination study time. Furthermore, this analysis could help residency programs develop or improve educational conferences and journal clubs. CLINICAL RELEVANCE: An understanding of question content and sources should enable efficient learning and improved scores on this section of the examination.

Technique for Lumbar Pedicle Subtraction Osteotomy for Sagittal Plane Deformity in Revision.

Pedicle subtraction osteotomies are being used with increasing frequency to treat the problem of sagittal imbalance caused by a variety of diseases. Here we describe a simple technique that assists in osteotomy closure and has proved effective and reliable in maintaining correction.