Publications by authors named "Dan Moriwaki"
Background: Postoperative osteolysis may be observed around poly-l-lactic acid (PLLA) pins in osteochondral fragments fixation for an osteochondral lesion of the talus (OLT). Hydroxyapatite (HA) improves biocompatibility, osteoconductivity, and mechanical strength when added to PLLA. This study aimed to compare the characteristics of osteolysis and clinical outcomes of fixation for OLT with PLLA pins vs PLLA/HA pins.
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- Chronic stress on the second metatarsal head in patients with hallux valgus can lead to osteoarthritis and dislocation of the second metatarsophalangeal joint.
- A study analyzed 115 HV feet, separating them into two groups based on dislocation presence and further categorizing those without dislocation by osteoarthritis status.
- Results indicated that greater protrusion of the second metatarsal and specific angles were linked to higher risks of dislocation and osteoarthritis in the joint.
Article Synopsis
- - The study investigates the effects of posterior talofibular ligament (PTFL) injury on outcomes after arthroscopic repair of the anterior talofibular ligament (ATFL) in patients with chronic lateral ankle instability (CLAI).
- - MRI findings showed that PTFL thickness and cross-sectional area were larger in people with CLAI, and PTFL injuries were associated with higher recurrence rates of ankle instability post-surgery.
- - While PTFL injuries didn’t significantly affect clinical scores after surgery, the presence of these injuries correlated with a greater likelihood of instability recurrence and associated injuries to other ligaments.
Article Synopsis
- This study investigates the relationship between Hounsfield unit (HU) measurements in subchondral bone and the condition of articular cartilage in ankle osteoarthritis (OA).
- Researchers gathered talar articular surfaces from 14 ankles and assessed them histologically and via CT imaging, correlating HU values with cartilage degeneration.
- The findings reveal that as OA worsens, both cartilage defects and subchondral bone thickness increase, with significant correlations between HU values and cartilage health observed, suggesting that HU measurement can help evaluate joint surface conditions.
Article Synopsis
- Surgical treatment of osteochondral lesions of the talus (OLT) often has variable outcomes for athletes, particularly related to medial OLT with underlying structural issues.
- The study examined 81 ankles in 74 patients, focusing on the impact of preoperative abnormalities in the posterior tibial tendon (PTT) as seen in MRI scans.
- Results indicated that patients with PTT abnormalities showed worse postoperative clinical outcomes, including lower JSSF scores and decreased arch height compared to those without such abnormalities.
Background: Ankle osteoarthritis (OA) mainly arises from trauma, particularly lateral ligament injuries. Among lateral ligament injuries, ankles with calcaneofibular ligament (CFL) injuries exhibit increased instability and can be a risk factor ankle OA progression. However, the relationship between CFL injury and OA progression remains unclear.
View Article and Find Full Text PDFBackground: Arthroscopic ankle arthrodesis (AAA) has become popular because of its higher rate of bone union, lower invasiveness, and shorter hospital stays compared to those of open arthrodesis. However, postoperative malalignment is often observed for severe varus deformity, which can cause nonunion, pain, and adjacent joint arthrosis. A compression staple can provide a persistent, strong compressive force on the bone surface.
View Article and Find Full Text PDFIn placing the medial suture button for syndesmosis injury, the risk of great saphenous vein and saphenous nerve injury has been reported. This study aimed to determine the safe insertion angle of the guide pin to avoid saphenous structure injury during suture button fixation. The incidence of saphenous structure injury was investigated using 8 legs of cadavers.
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- The study investigates the link between osteoarthritis (OA) changes on x-rays and cartilage condition during surgery for osteochondral lesions of the talus (OLT).
- Researchers analyzed 70 ankles using radiographic scores for OA features like osteophytes and joint space narrowing, alongside evaluations through arthroscopy and histological analysis.
- Findings revealed that worse OA scores correlated with higher degeneration grades and smaller lesion sizes, suggesting that x-ray changes can help predict cartilage health during OLT surgery.