Publications by authors named "Kazuichiro Ohnishi"
Postoperative onset lateral hinge fracture is a risk factor for delayed union of the tibial tuberosity in medial opening wedge distal tibial tuberosity osteotomy.
Asia Pac J Sports Med Arthrosc Rehabil Technol
July 2024
Article Synopsis
- - This study assessed the healing of the tibial tuberosity in patients who had a specific type of leg surgery called medial opening wedge distal tibial tuberosity osteotomy (OWDTO) and looked for connections between healing and a condition known as lateral hinge fractures (LHFs).
- - Data from 61 patients were analyzed, showing that while 13 patients experienced postoperative LHFs, all healed with conservative treatments within 6 months; factors like age and the angle of the tibia were linked to better healing outcomes.
- - The findings concluded that LHFs significantly contributed to delayed healing of the tibial tuberosity, whereas the thickness of the osteotomy did not; thus, preventing LHFs is important for promoting healing
Article Synopsis
- The study investigates the impact of medial opening wedge distal tibial tuberosity osteotomy (OWDTO) on neuropathic pain (NP) in patients with knee osteoarthritis (OA), revealing a significant decrease in NP after surgery.
- Fifty-two patients were assessed using the painDETECT questionnaire, and outcomes measured through WOMAC and Knee Society Score (KSS) show that preoperative NP correlates with higher pain and lower physical function scores.
- Results suggest that OWDTO effectively alleviates knee symptoms and improves function, leading to increased patient satisfaction, particularly for those initially presenting with possible NP.
Article Synopsis
- The study investigates how changes in the posterior tibial slope (PTS) affect clinical outcomes in cruciate-retaining total knee arthroplasty (CR-TKA), focusing on patient satisfaction and joint awareness.
- Results show that patients with an increased PTS experienced significantly higher scores on the Knee Society Score (KSS) and lower scores on the Forgotten Joint Score-12 (FJS), indicating better overall symptoms and satisfaction.
- Additionally, the study finds a correlation between PTS changes and decreased medial compartment loading, suggesting that increased PTS may lead to better outcomes due to reduced stress on the knee during flexion.
Article Synopsis
- The study aimed to explore the link between neuropathic pain (NP) and radiological findings in knee osteoarthritis (OA) patients undergoing surgery.
- Out of 197 patients, 34 were identified with possible NP, exhibiting higher central sensitization and worse symptoms compared to those with unlikely NP.
- No specific radiological indicators were found to predict NP in knee OA; however, patients with possible NP tended to have more severe pain and reduced knee function.
Article Synopsis
- The study investigated how the surgeon's experience affects the reproducibility of joint gap measurements during manual stress in robotic-assisted total knee arthroplasty (TKA) and whether the distraction force remains consistent throughout the range of motion (ROM).
- Results showed that an experienced surgeon achieved significantly larger joint gaps compared to an inexperienced surgeon, especially during specific flexion angles.
- There was a correlation between the gap measurement differences and preoperative hip-knee-ankle (HKA) angles, suggesting that the surgical technique and patient anatomy both influence joint stability outcomes.
Background: The purpose of this study was to investigate axial load resistance of the tibia depending on the thickness of tibial tuberosity osteotomy in medial open-wedge distal tuberosity proximal tibial osteotomy (OWDTO). The hypothesis is that a thin tibial tuberosity osteotomy shows high axial load resistance of the tibia.
Methods: The OWDTO model was constructed from imitation bones of the tibia.
Background: The function of the anterior cruciate ligament (ACL) in osteoarthritis (OA) of the knee remains to be elucidated. The purpose of this study is to evaluate histological changes of the ACL in end-stage knee OA and to clarify the relationship between histological changes in the ACL and knee function.
Hypothesis: The hypothesis in this study was that ACL degeneration in knee OA is associated with decreased knee function.
Purpose: Although the joint gap distance and compartment loading of the knee are different parameters for obtaining balanced knees in patients with total knee arthroplasty (TKA), the extent to which a balanced knee is achieved in patients with mechanically aligned TKA (MA-TKA) is unclear. This study aimed to investigate the anatomical factors that affect the ligament balancing in MA-TKA according to a gap balancing technique by measured resection technique.
Methods: The relationship between compartment loading, gap distance, and lower limb alignment was analysed in forty-three patients who underwent navigation-assisted MA-TKA with the minimum soft-tissue release.
Article Synopsis
- - The study aimed to determine if the medial proximal tibial angle (MPTA) at the posterior tibial plateau can indicate the pre-arthritic MPTA in knees with advanced osteoarthritis (OA) that still have an intact anterior cruciate ligament (ACL).
- - In the analysis of 100 OA knees, researchers examined the hip-knee-ankle (HKA) angles and MPTAs using computed radiography and computed tomography, discovering variations in MPTA measurements across different regions of the tibial plateau.
- - The findings suggested that the MPTA at the posterior tibial plateau is reflective of the pre-arthritic MPTA in ACL-intact advanced OA knees, with significant correlations
Study Design: Cross-sectional observational study.
Purpose: To examine whether pelvic rotation as a compensatory mechanism for sagittal imbalance is related to quality of life (QOL).
Overview Of Literature: Poor sagittal alignment is associated with compensatory pelvic retroversion and decreased QOL.
Clinical course and outcomes of simultaneous-versus staged-bilateral medial opening wedge high tibial osteotomy.
Asia Pac J Sports Med Arthrosc Rehabil Technol
January 2021
Background: Difference in the clinical course and outcomes between simultaneous- and staged-bilateral medial opening wedge high tibial osteotomies (OWHTOs) over time was unknown. The study hypothesis was that patients who underwent simultaneous-bilateral OWHTO (SMBO) have a more rapid improvement in knee function than those who underwent staged-bilateral OWHTO (STBO) due to difference in the change of lower limb alignment between SMBO and STBO.
Methods: The records of 56 knees in 28 patients who underwent either SMBO (n = 28) or STBO (n = 28) were retrospectively analysed.
Article Synopsis
- The proximal femoral nail antirotation is a modern intramedullary device designed to treat trochanteric femoral fractures, using a helical blade for better stability in osteoporotic bones.
- Despite its benefits, this device can lead to complications, including a rare issue of the helical blade perforating through the femoral head.
- A case is reported involving a 79-year-old woman who experienced acetabular perforation due to the migration of the helical blade after treatment for an unstable trochanteric fracture.
Article Synopsis
- A 27-year-old male with L2 spondylolysis experienced unresolved pain after conservative treatment for two years due to his heavy labor job.
- The patient underwent successful segmental wire fixation and bone graft surgery, resulting in complete pain resolution six months post-operation, marking a pioneering case of effective surgical treatment for upper lumbar spondylolysis.
Background Context: Chronic, continuous stress at the junction of a stable/unstable site of the spine in diffuse idiopathic skeletal hyperostosis (DISH) has been reported to cause a nonunion. Back pain resulting from the nonunion has been rarely reported and few operative treatments have been suggested.
Purpose: To report and discuss the pathogenesis, treatment, and surgical outcome of a rare cause of back pain.
Effects of wearing halo vest on gait: three-dimensional analysis in healthy subjects.
Spine (Phila Pa 1976)
April 2005
Study Design: The effects of a halo vest on the gait were studied. The motions of the head, shoulder girdle, trunk, and hip were analyzed with the vest and tong either connected by bars or unconnected.
Objective: To analyze effects of wearing a halo vest using three-dimensional motion analysis.