Practical Fast-Response Anodized-Aluminum Pressure-Sensitive Paint Using Chemical Adsorption Luminophore as Optical Unsteady Pressure Sensor.

We developed and evaluated an anodized-aluminum pressure-sensitive paint (AA-PSP) with new formulations of free-base porphyrin, H2TCPP, as an optical unsteady pressure sensor. The luminophore H2TCPP has quite a short fluorescent lifetime (2.4 ns on the condition of the AA-PSP).

Costal Osteochondral Autograft for Advanced Osteochondritis Dissecans of the Humeral Capitellum in Adolescent and Young Adult Athletes: Clinical Outcomes with a Mean Follow-up of 4.8 Years.

Background: Costal osteochondral grafting is a technique to achieve anatomical and biological repair of articular defects. Some small series of clinical applications of this procedure for advanced osteochondritis dissecans of the humeral capitellum, with short-term follow-up, have been reported; however, longer-term outcomes remain unclear. The purpose of this study was to clarify longer-term clinical outcomes of costal osteochondral autografts in the treatment of advanced osteochondritis dissecans of the humeral capitellum.

The relationship between nerve conduction velocity and fiber morphology during peripheral nerve regeneration.

We analyzed the relationship between motor nerve conduction velocity (MCV) and morphological changes in regenerating nerve fibers at different times after sciatic nerve transection to identify reliable indices of functional recovery. Thirty rats were divided into five equal groups, one control group and four groups subjected to sciatic nerve transection and immediate suturing, followed by regeneration for 50, 100, 150, and 200 days, respectively. MCV was measured in each group, followed by morphometric analyses of fibers of the common peroneal nerve.

Application of a navigation system for contouring anatomical plasty of the distal end of the humerus.

The effectiveness of navigation systems in performing accurate orthopaedic surgery has been reported previously, but there have been no reports on the application of navigation in surgeries involving bone resection around the elbow joint. In this study, anatomical plasty or bone resection was performed to restore anatomical morphology in 10 cases of osteoarthritis of the elbow and deformity of the distal end of the humerus. Bone resection was performed on the distal end of the humerus using navigation and on the proximal end of the ulna via freehand surgery.

Open reduction and internal fixation for dorsal fracture dislocations of the proximal interphalangeal joint using a miniplate.

Various operative techniques have been described for unstable dorsal fracture dislocations of the proximal interphalangeal (PIP) joint with articular involvement. However, this injury still remains a therapeutic challenge for hand surgeons because no single technique guarantees successful outcomes. We performed a novel procedure using a low-profile miniplate, which allows for anatomic reduction, rigid internal fixation, and early finger joint motion.

Carpal tunnel syndrome caused by a ganglion in the carpal tunnel with an atypical type of palsy: a case report.

Carpal tunnel syndrome caused by a ganglion is a rare condition. We report a case which presented with a rapidly progressive onset of symptoms and subsequent thenar palsy.

Locked metacarpophalangeal joint of the little finger due to hyperextension injury: a case report.

We treated a rare case of locked metacarpophalangeal joint of the little finger due to a hyperextension injury. The mechanism of the occurrence was considered to be closely similar to those that happened in the thumb, and the locking was successfully released by a manual reduction without complication.

Custom-made splint treatment for osteoarthritis of the distal interphalangeal joints.

Purpose: We investigated the usefulness of a custom-made splint for treatment of painful osteoarthritis of the distal interphalangeal (DIP) joints. The splint was designed to be easily detachable so as not to diminish finger pad sensation or interfere with proximal interphalangeal joint motion.

Methods: We enrolled 25 patients (24 women and one man, mean age 58 y) with painful osteoarthritis of the DIP joints of the fingers and thumbs in this cohort study.

Percutaneous pinning of the displaced volar plate avulsion fracture of the PIP joint.

The use of operative or non-operative techniques in the treatment of a volar plate avulsion fracture of the PIP joint has remained controversial. In this study, we describe the use of percutaneous K-wire fixation in 15 patients with a displaced and rotated large fragment of this injury. All processes of the technique, including reduction and interfragmental fixation, were performed with percutaneous K-wires.

Subungual extraskeletal chondroma with finger nail deformity: case report.

We report a subungual extraskeletal chondroma with a convex nail deformity originating from the index finger in a 39-year-old man. The tumor was excised and its histopathology showed obvious nuclear pleomorphism. However, the Ki-67 (MIB-1) labeling index was less than 1%, indicating low proliferative activity; it was classified as an extraskeletal chondroma with atypical features.

Flexor digitorum profundus tendon rupture associated with distal radius fracture malunion: a case report.

We present a case of subcutaneous flexor tendon rupture of the index finger following malunion of a distal radius fracture. The cause of the tendon rupture was mechanical attrition due to a bony prominence at the palmar joint rim in the distal radius due to malunion. Corrective osteotomy and the Sauvé-Kapandji procedure were carried out for the wrist pain and forearm rotation disability and a tendon graft was carried out for the flexor tendon rupture.

A large intra-articular loose body in the metacarpophalangeal joint of the middle finger mimicking a calcified tumorous lesion: a case report.

We will report on a case with a large intra-articular loose body in the metacarpophalangeal (MP) joint of the middle finger in a 30-year-old-male, which was mimicking a calcified tumourous lesion adjacent to the palmar side of the metacarpal head. It was easily removed through the palmar approach.

Locking of the metacarpophalangeal joint of the thumb by a loose body: a case report.

We report a case with locking of the metacarpophalangeal (MP) joint of the thumb in a 15-year-old high school baseball catcher, which was caused by an intra-articular loose body arising from osteochondritis dissecans. The loose body was removed arthroscopically, enabling early return to full MP joint function.

Comminuted fractures of the radial head: comparison of resection and internal fixation. Surgical technique.

Background: Satisfactory internal fixation of comminuted radial head fractures is often difficult to achieve, and radial head resection has been the accepted treatment. In this study, we compared the results of radial head resection with those of open reduction and internal fixation in patients with a comminuted radial head fracture.

Methods: Twenty-eight patients with a Mason type-III radial head fracture (some with associated injuries) were enrolled in the study.

Comminuted fractures of the radial head. Comparison of resection and internal fixation.

Background: Satisfactory internal fixation of comminuted radial head fractures is often difficult to achieve, and radial head resection has been the accepted treatment. In this study, we compared the results of radial head resection with those of open reduction and internal fixation in patients with a comminuted radial head fracture.

Methods: Twenty-eight patients with a Mason type-III radial head fracture (some with associated injuries) were enrolled in the study.

Reconstructive procedure to repair chronic injuries to the collateral ligament of metacarpophalangeal joints of the hand.

We have devised a reconstructive procedure to repair chronic injuries to the collateral ligament of metacarpophalangeal (MCP) joints. It comprises palmaris longus tendon grafting into a bone tunnel and suturing onto the base of the residual ligament without involving fixation of the tendon graft stump. Thirteen patients were treated for injured MCP joints: thumb/ulnar, ten cases; thumb/radial, two; and middle finger/radial, one.

Evaluation of morphological and functional regeneration of rat nerve-muscle units after temporary and permanent tubulization.

We compared the ability of temporary and permanent tubing to achieve morphological and functional recovery of nerve-muscle units, following experimental nerve transection (8-mm gap) in rat tibial nerve. Electrical stimulation of the sciatic nerve was used to analyze tension output, evoked electromyogram and conduction-transmission time (CTT) of denervated nerve-muscle units. Morphological analysis of the nerve and muscle was also performed.

Promoting nerve regeneration through long gaps using a small nerve tissue graft.

Background: If nerve tissue is capable of inducing regeneration, as suggested by the neurotropism theory, then even small pieces of nerve tissue should have the potential to induce nerve regeneration. Therefore, long gaps might presumably be bridged via the neurotrophic potential of small pieces of nerve tissue grafted into the middle of the nerve gap. It is necessary to confirm the validity of the neurotropism theory and to also explore the potential usefulness of small nerve grafting through long gaps.

Periosteal chondroma of the proximal phalanx of the thumb.

A 52-year-old man presented with a periosteal chondroma in the base of the proximal phalanx of the right thumb. Magnetic resonance imaging (MRI) showed invasion of the bone marrow, which suggested malignancy. Although the clinical and MRI findings indicated a malignant tumour, the histopathological examination showed a benign periosteal chondroma.