Publications by authors named "Yasuhiro Fukai"
Background: The presence of full-thickness cartilage in the lateral compartment on valgus stress radiography is a criterion for medial mobile-bearing unicompartmental knee arthroplasty (UKA). However, the appropriateness of medial UKA is uncertain when preoperative MRI shows extrusion of the lateral meniscus. We therefore assessed how preoperative MRI-detected lateral meniscus extrusion affects mid-term functional outcomes after mobile-bearing UKA.
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- - This study compared the lateral distal femoral angle (LDFA) between knees with medial osteoarthritis (mOA) and those without, aiming to verify the claim that there is no bone wear on the femoral surface in kinematic alignment total knee arthroplasty (KA-TKA).
- - Involving 69 patients, results showed significant varus angles in both LDFA and medial proximal tibial angle (MPTA) in mOA knees compared to non-OA knees, but no significant difference was found in certain hip-knee-ankle angles.
- - The findings challenge the assumption of no bone wear and suggest that a standard cartilage wear compensation of 2 mm may be inadequate, highlighting the need for
Article Synopsis
- A study explored the effectiveness of a pre-milling technique in unicompartmental knee arthroplasty (UKA) to improve posterior tibial cut thickness and reduce the need for recuts.
- The research included 213 knees in a conventional surgery group and 198 knees in a pre-milling group, comparing bone cut thickness and rates of tibial recuts.
- Results showed that the pre-milling technique led to increased bone cut thickness in small and medium femoral components and significantly reduced the rate of tibial recuts compared to the conventional method.
Introduction This study aimed to evaluate whether the arithmetic hip-knee-ankle angle (aHKA) can be used to predict the postoperative HKA. Methods This study included 248 knees in 166 patients who underwent Oxford unicompartmental knee arthroplasty (UKA) between February 2021 and November 2022. Through preoperative and postoperative long-leg radiography, the medial proximal tibial angle (MPTA) and the lateral distal femoral angle (LDFA) were expressed as the deviation from the perpendicular line to the mechanical axes, and the mechanical HKA (mHKA) was defined as the angle between the femoral and tibial mechanical axes.
View Article and Find Full Text PDFRestricted kinematic alignment total knee arthroplasty (rKA-TKA) is a reasonable selection for avoiding an extreme alignment that has been conceded to induce implant failure. However, computer-aided devices (CAS), such as navigation, robotics, and patient-specific instrumentation, are necessary to perform rKA-TKA. This paper reports on the surgical technique of kinematic alignment total knee arthroplasty (KA-TKA) using mechanical instruments.
View Article and Find Full Text PDFWe describe the use of a short transverse incision technique with muscle retention for unicompartmental knee arthroplasty (UKA). The incision is made transversely just above the joint line, followed by a detachment of subcutaneous soft tissue from the underlying capsule and fascia to create a mobile window. The fascia is incised along the medial border of the vastus medialis and the capsule of the suprapatellar pouch is incised laterally, preserving vastus medialis muscle.
View Article and Find Full Text PDFPurpose: To elucidate the relationship between the anatomic position of the inferior alveolar nerve (IAN) at the mandibular second molar and the occurrence of neurosensory disturbances of the IAN after sagittal split ramus osteotomy (SSRO) in patients with mandibular prognathism. Also, the present study evaluated the difference in anatomic position of the IAN between patients with and without mandibular prognathism.
Patients And Methods: Computed tomography images were taken of 28 patients with mandibular prognathism and 30 without prognathism.