Associations of pain sensitisation with tender and painful joint counts in people with hand osteoarthritis: results from the Nor-Hand study

ObjectiveTo examine associations of pain sensitisation with tender and painful joint counts and presence of widespread pain in people with hand osteoarthritis (OA).MethodsPressure pain thresholds (PPT) at a painful finger joint and the tibialis anterior muscle, and temporal summation (TS) were measured in 291 persons with hand OA. We examined whether sex-standardised PPT and TS values were associated with assessor-reported tender hand joint count, self-reported painful hand and total body joint counts and presence of widespread pain using linear and logistic regression analyses adjusted for age, sex, body mass index, education and OA severity.ResultsPeople with lower PPTs at the painful finger joint (measure of peripheral and/or central sensitisation) had more tender and painful hand joints than people with higher PPTs. PPT at tibialis anterior (measure of central sensitisation) was associated with painful total body joint count (beta=−0.82, 95% CI −1.28 to –0.35) and presence of widespread pain (OR=0.57, 95% CI 0.43 to 0.77). The associations between TS (measure of central sensitisation) and joint counts in the hands and the total body were statistically non-significant.ConclusionThis cross-sectional study suggested that pain sensitisation (ie, lower PPTs) was associated with joint counts and widespread pain in hand OA. This knowledge may be used for improved pain phenotyping of people with hand OA, which may contribute to better pain management through more personalised medicine. Further studies are needed to assess whether a reduction of pain sensitisation leads to a decrease in tender and painful joint counts.

KETEGUHAN LENTUR DAN KETEGUHAN PATAH SAMBUNGAN FINGER JOINT KAYU MERANTI (Shorea sp) PADA POSISI SAMBUNGAN VERTIKAL & HORIZONTAL

Keterbatasan panjang kayu yang tersedia dilapangan mengharuskan bahan elemen sruktur disambung. Namun semakin panjang bahan elemen struktur tersebut, gaya lentur yang akan terjadi akan semakin besar bahkan dapat mengakibatkan patah bila beban yang bekerja pada bahan tersebut tidak seimbang dengan kemampuan dari pada bahan tersebut. Untuk itu perlu diteliti jenis sambungan yang bisa menahan gaya lentur dengan lebih baik. Proses pengujian penelitian ini menggunakan kayu solid dan papan finger joint yang dipotong dengan ukuran 2 cm x 5 cm x 20 cm masing masing sebanyak 15 pengulangan setiap pengujian. Pengujian yang dilakukan antara lain pengujian kadar air, pengujian kerapatan, pengujian MoE dan yang terakhir yaitu pengujian MoR.Dari hasil pengujian MoR dan MoE papan finger joint, didapat bahwa nilai MoE finger joint meningkat 31,75 % terhadap nilai MoE kayu utuh, sedangkan untuk MoR finger joint telah menurun sebesar 24,14 % terhadap MoE kayu utuhnya.

Traumatic Dorsal Hand Reconstruction through A free Anterolateral Thigh Flap, Induced Membrane Technique, Toe Joint Transfer, and Joint Prosthesis

Introduction:This study presents a case of post-traumatic dorsal hand reconstruction by describing the surgical technique in several stages and the outcome. Case report:It involves a patient with loss of cutaneous tissue, loss of bone, and tendon in the dorsal hand and fingers following a car accident. He was treated on a four-stage hand salvage and reconstruction. Stage one fulfilled in emergency involved K-wire and osseous filling through acrylic cement, hunter tendon rods, and a free anterolateral thigh flap. The second stage at 2 months involved osseous grafts and finger joint prostheses. The third stage time at 7 months involved a toe joint transfer. The last stage at 11 months involved extensor tendons graft reconstruction. The functional outcome at 2 years is acceptable. Conclusion:The post-traumatic dorsal hand reconstruction requires several techniques to reconstruct the losses of substances observed and this in several stages. It allowed to have an acceptable hand function. Keywords:Hand injuries, induced membrane, finger joint prosthesis, tendon transfer.

Identify Finger Rotation Angles With ArUco Markers and Action Cameras

Measuring the motion of human hand joints is a challenging task due to the high number of DOFs. In this study, we proposed a low-cost hand tracking system built on action cameras and ArUco markers to measure finger joint rotation angles. The lens distortion of each camera was corrected first via intra-calibration and the videos of different cameras were aligned to the reference camera using a dynamic time warping based method. Two methods were proposed and implemented for extracting the rotation angles of finger joints: one is based on the 3D positions of the markers via inter-calibration between cameras, named pos-based method; the other one is based on the relative marker orientation information from individual cameras, named rot-based method. An experiment was conducted to evaluate the effectiveness of the proposed system. The right hand of a volunteer was included in this practical study, where the movement of the fingers was recorded and the finger rotation angles were calculated with the two proposed methods, respectively. The results indicated that although using the rot-based method may collect less data than using the pos-based method, it was more stable and reliable. Therefore, the rot-based method is recommended for measuring finger joint rotation in practical setups.