The entry point of intramedullary tibia cutting guide should vary according to the individual tibia morphology in TKA.

Introduction: In total knee arthroplasty (TKA) using the intramedullary tibial cutting guide (IMTCG), the positioning of the IMTCG is important for accurate tibial bone resection. The aim of this study was to evaluate the ideal entry point of IMTCG and affecting radiologic factors.

Materials And Methods: From May 2017 to February 2018, 91 consecutive TKAs for osteoarthritis were included.

Evolution of Spinal Endoscopic Surgery.

Innovations in the development of endoscopic spinal surgery were classified into different generations and reviewed. Future developments and directions for endoscopic spinal surgery were discussed. Surgical therapy for spinal disease has been gradually changing from traditional open surgery to minimally invasive spinal surgery.

Redefining the Evolution of Spinal Discal Cyst Under Percutaneous Endoscopy: Report of Two Cases.

Discal cyst has been recognized as a distinct cause of back pain and radiculopathy. The clinical features are similar to other pathologies as disc prolapse and stenosis. Various treatment modalities have been described, ranging from nerve blocks to surgical excision.

Impact of preoperative varus deformity on postoperative mechanical alignment and long-term results of "mechanical" aligned total knee arthroplasty.

Purpose: Preoperative varus deformity may affect postoperative mechanical alignment and outcomes of total knee arthroplasty (TKA). In this study, we aimed to determine whether (1) greater degrees of preoperative varus deformity increase the incidence of varus-aligned TKAs and (2) residual varus alignment improves the long-term survival rate in TKAs with preoperative varus deformity.

Methods: We retrospectively reviewed 905 primary TKAs for varus-type osteoarthritis from November 1998 to June 2009.

Percutaneous Endoscopic Contralateral Lumbar Foraminal Decompression via an Interlaminar Approach: 2-Dimensional Operative Video.

Nerve root compression by foraminal pathology is challenging for a surgeon to decompress without violating the facet joint, which may necessitate a fusion procedure. One nonfusion approach to foraminal pathology is a combination intracanal approach for a laminotomy/foraminotomy followed by a paraspinal Wiltse approach for far lateral decompression. Unfortunately, even with the combination approach, it continues to be difficult to achieve adequate decompression without violating much of the facet joint overlying the nerve root.

Acute burst fracture in Kummell's disease with acute onset neurological deficit: a case report on role of spinal stability and technical notes on "pivot ligamentotaxis".

Background: Kummell's Disease has insidious progression. Neurological deficit is usually slow in onset and progression and only few cases of acute neurological deficit have been reported. We came across a case of Kummell's disease which progressed to burst fracture, developed neurological deficit within two weeks.

Anatomical Relationship of the Vertebral Artery With the Lateral Recess: Clinical Importance for Posterior Cervical Foraminotomy.

Objective: Vertebral artery injuries during posterior cervical foraminotomy are rare, but can be fatal. Therefore, we investigated the anatomical correlation between the lateral recess and the vertebral artery.

Methods: On axial cuts of cervical magnetic resonance imaging from 108 patients, we measured the distance between the vertebral arteries and the medial border of the facet joints.

Percutaneous Endoscopic Transforaminal Approach for Far Lateral Lumbar Discectomy: 2-Dimensional Operative Video.

The conventional surgical approach to far lateral lumbar disk herniations is a paraspinal Wiltse approach. During the Wiltse approach, it is sometimes necessary to resect some of the facet or pars interarticularis to achieve an adequate exposure. The endoscopic transforaminal route can be of benefit in far lateral disk herniations due to direct access to the epidural space through Kambin's triangle, without the need for any bony removal or nerve retraction.

Transforaminal Epiduroscopic Basivertebral Nerve Laser Ablation for Chronic Low Back Pain Associated with Modic Changes: A Preliminary Open-Label Study.

Background: Chronic low back pain (CLBP) arising from degenerative disc disease continues to be a challenging clinical and diagnostic problem whether treated with nonsurgical, pain intervention, or motion-preserving stabilization and arthrodesis.

Methods: Fourteen patients with CLBP, greater than 6 months, unresponsive to at least 4 months of conservative care were enrolled. All patients were treated successfully following screening using MRI findings of Modic type I or II changes and positive confirmatory provocative discography to determine the affected levels.

A Mobile Outside-in Technique of Transforaminal Lumbar Endoscopy for Lumbar Disc Herniations.

Percutaneous endoscopic transforaminal lumbar discectomy (PETLD) has now become a standard of care for the management of lumbar disc disease. There are two techniques for the introduction of a working cannula with respect to disc-outside-in and inside-out. The aim of this prospective study is to describe the technical aspects of a novel mobile outside-in method in dealing with different types of disc prolapse.

Transforaminal Endoscopic Excision of Intradural Lumbar Disk Herniation and Dural Repair.

Background: Intradural disk herniation is a rare entity with <0.3%-1% of all disk herniations and at an L2-L3 level even rarer. The dural defects repairs on ventral aspect are technically challenging and may not be possible after durotomy, so many authors have placed fascia, muscle, or plugging by the hemostatic material.

Percutaneous Endoscopic Lumbar Discectomy for All Types of Lumbar Disc Herniations (LDH) Including Severely Difficult and Extremely Difficult LDH Cases.

Background: Lumbar disc herniation (LDH) is being treated with limited indication by percutaneous full endoscopic lumbar discectomy. However, microscopic lumbar discectomy (MLD) is still considered as a gold standard.

Objective: With the advances in spinal endoscopic instruments and surgical techniques, all LDHs have now become operable with percutaneous full endoscopic lumbar discectomy procedure.

Feasibility of Full Endoscopic Spine Surgery in Patients Over the Age of 70 Years With Degenerative Lumbar Spine Disease.

Objective: Degenerative spine disease, encompassing disc prolapse and stenosis, is a common ailment in old age. This prospective study was undertaken to evaluate the role of endoscopic spine surgery in elderly patients (above 70 years of age) with clinical and radiological follow-up.

Methods: In this study, a prospective analysis was conducted of 53 patients with lumbar disc prolapse or spinal stenosis who were treated with percutaneous endoscopic discectomy or decompression from November 2015 to June 2017.

Full Endoscopic Lumbar Discectomy using the Calcification Floating Technique for Symptomatic Partially Calcified Lumbar Herniated Nucleus Pulposus.

Background: Partially calcified lumbar herniated nucleus pulposus (HNP) can cause severe radiating pain and neurologic symptoms requiring surgical treatment. As it is not safe to enforce conventional endoscopic lumbar discectomy using trephine or burr to remove the partially calcified disc, we report a calcification floating technique using a working channel for the treatment of these cases.

Methods: We retrospectively analyzed 31 patients who underwent full endoscopic discectomy using this technique for partially calcified lumbar HNP between April 2009 and June 2013.

Percutaneous full endoscopic treatment of cystic lymphangioma of cauda equina: a case report.

Intraspinal epidural lymphangioma of cauda equina are extremely rare, only three cases have been reported in the past. We report a 63-year-old female with lymphangioma at S1-S2 level which was resected under epidural anesthesia using a percutaneous full endoscope with no evidence of recurrence at 19 months follow-up.

Suprapedicular Circumferential Opening Technique of Percutaneous Endoscopic Transforaminal Lumbar Discectomy for High Grade Inferiorly Migrated Lumbar Disc Herniation.

Purpose: To evaluate the efficacy of suprapedicular circumferential opening technique (SCOT) of percutaneous endoscopic transforaminal lumbar discectomy (PETLD) for high grade inferiorly migrated lumbar disc herniation.

Material And Methods: Eighteen consecutive patients who presented with back and leg pain with a single-level high grade inferiorly migrated lumbar disc herniation were included. High grade inferiorly migrated disc was removed by the SCOT through PETLD approach.

Magnetic Resonance Imaging Undetectable Epiduroscopic Hotspot in Chronic Diskogenic Back Pain-Does Sinuvertebral Neuropathy Actually Exist?

Background: The causes of chronic diskogenic back pain have not yet been clearly identified. Neural ingrowth around the annulus is widely considered to be one of the possible cause. However, neuropathy around the annulus has yet to be observed visually.

Acute Bilateral Isolated Foot Drop: Changing the Paradigm in Management of Degenerative Spine Surgery with Percutaneous Endoscopy.

Background: Acute bilateral isolated foot drop due to lumbar disk prolapse with canal stenosis is rare with only 3 cases reported in literature. Our patient was managed using the percutaneous full endoscopic technique. This is mainly to highlight the ease of access and patient outcome with preoperative and postoperative images to support our minimally invasive treatment for this rare condition.

Lumbar chronic subdural hematoma mimicking an intradural extramedullary tumor: A case report.

Background: Chronic spinal subdural hematomas are extremely rare with only 28 cases reported in the literature. Nevertheless, they should be considered among the differential diagnoses for spinal intradural/extramedullary lesions.

Case Report: A 65-year-old male presented with progressive back pain and right S1 radiculopathy.

Early Outcomes of Endoscopic Contralateral Foraminal and Lateral Recess Decompression via an Interlaminar Approach in Patients with Unilateral Radiculopathy from Unilateral Foraminal Stenosis.

Objective: Percutaneous endoscopic contralateral interlaminar lumbar foraminotomy (PECILF) for lumbar degenerative spinal stenosis is an established procedure. Better preservation of contralateral facet joint compared with that of the approach side has been shown with uniportal bilateral decompression. The aim of this retrospective case series was to analyze the early clinical and radiologic outcomes of stand-alone contralateral foraminotomy and lateral recess decompression using PECILF.

Analysis of Clinical Results of Three Different Routes of Percutaneous Endoscopic Transforaminal Lumbar Discectomy for Lumbar Herniated Disk.

Objective: Percutaneous endoscopic transforaminal lumbar discectomy (PETLD) can be performed by using foraminal, intervertebral, and suprapedicular routes. The aim of this study was to assess clinical results of three different routes of PETLD.

Methods: One hundred eleven patients who underwent PETLD between January 2016 and October 2016 were included in this study.

Percutaneous Full Endoscopic Bilateral Lumbar Decompression of Spinal Stenosis Through Uniportal-Contralateral Approach: Techniques and Preliminary Results.

Background: When considering various risk factors such as age, comorbidities, and complications related to the surgical procedure itself, open surgery in degenerative spinal stenosis is likely to cause more complications. Here, we report the surgical procedure and preliminary clinical results of percutaneous endoscopic stenosis lumbar decompression (PESLD) technique using a uniportal-contralateral approach for bilateral decompression of degenerative spinal stenosis.

Materials And Methods: Electronic medical records of 48 consecutive patients who were treated between January 2016 and August 2016 were reviewed retrospectively.

The clinical characteristics of lower lumbar osteoporotic compression fractures treated by percutaneous vertebroplasty : a comparative analysis of 120 cases.

Objective: The purpose of this study is to provide accurate understanding of clinical presentations and surgical outcomes as well as to identify the unique characteristics of lower lumbar osteoporotic compression fracture (OCF).

Methods: Clinical data were collected from 120 patients who had L3, L4 or L5 percutaneous vertebroplasty (PVP) performed from 2008 to 2012 at the single institute. L4 or L5 PVP patients were classified into group 1 and group 2 was for L3 PVP patients.