Reconstruction of hidden 3D shapes using diffuse reflections

We analyze multi-bounce propagation of light in an unknown hidden volume and demonstrate that the reflected light contains sufficient information to recover the 3D structure of the hidden scene. We formulate the forward and inverse theory of secondary and tertiary scattering reflection using ideas from energy front propagation and tomography. We show that using careful choice of approximations, such as Fresnel approximation, greatly simplifies this problem and the inversion can be achieved via a backpropagation process. We provide a theoretical analysis of the invertibility, uniqueness and choices of space-time-angle dimensions using synthetic examples. We show that a 2D streak camera can be used to discover and reconstruct hidden geometry. Using a 1D high speed time of flight camera, we show that our method can be used recover 3D shapes of objects "around the corner"

US-LARP progress on LHC IR upgrades

We review the progress on LHC IR upgrades made by the US-LARP collaboration since the last CARE meeting in November 2004. We introduce a new optics design with doublet focusing, and discuss energy deposition calculations with an open mid-plane dipole. We present the results of a beam-beam experiment at RHIC. This experiment was the first phase of a planned test of the wire compensation principle at RHIC

A comparative study between anterior and posterior approach for bipolar hemiarthroplasty in intracapsular fracture neck of femur

Background: The present study was undertaken to to compare the efficacy of treatment of intracapsular neck of femur fracture operated by anterior and posterior approaches.Methods: A total 100 patients of either sex, aged >65 years with intracapsular neck femur fracture were operated with hemiarthroplasty. The patients were divided into two equal groups and patients were operated alternatively one with anterior approach and the second with posterior approach. Functional outcomes were compared using Harris hip score and range of movements assessed clinically. Hip function and final outcome measures were noted and compared between two groups.Results: The mean age of patients was 63.1±5.3 years in group A and 65.8±5.4 years in group B with female to male ratio was 1.7:1 for group A and 1.8:1 for group B. Operating time for group A and for group B was 65 and 78 minutes respectively. Mean intraoperative blood loss was 120 ml in group A and 150 ml in group B. The most common complication in both the groups were infection and rate in group A was 9.70% and in group B was 13.50%. Posterior approach carried an increased risk of prosthetic dislocation as compared to anterior approach. There was no intraoperative mortality seen in follow up period.Conclusions: Anterior approach for hip hemiarthroplasty in elderly population with intracapsular femoral neck fractures provided significant benefit in early postoperative period when compared to the posterior approach in terms of duration of surgery, intraoperative blood loss, time of recovery, hip dislocation rate

Clinical outcome of platelet rich plasma versus steroid in treatment of frozen shoulder

Background: Evaluate functional outcome of use of platelet rich plasma versus steroid in frozen shoulder.Methods: The study was conducted in Department of Orthopaedics in RNT Medical College, Udaipur. Adult patients with periarthritis shoulder (frozen shoulder or adhesive capsulitis) admitted to Trauma centre in Maharana Bhupal Government hospital attached with R.N.T. Medical College, Udaipur were included in this study after obtaining their informed, valid written consent. This is a prospective study from October 2018 to February 2020.Results: Our study demonstrated that PRP is not inferior to CS in any of the measured parameters. Both of the groups experienced similar benefits from the injection therapies with no statistical differences detected in ROM or VAS scores at 1 week, 1 month and 3 months. No adverse effects were detected in either of the two groups.Conclusions: We can conclude that both PRP and MPS showed efficacy on treating frozen shoulder. The current study provides strong evidence in support of a statistically significant effect of platelet concentrates in the treatment of frozen shoulder in vivo where steroid contraindicated or refused by patient. However, inj. Methylprednisolone has sudden onset of action because of anti-inflammatory action with respect to inj. PRP, so has better result at 1 week follow up post injection. But in long term (at 3 months follow up) inj. PRP has better effect in compared to Inj. MPS

Our experience of the management of severe bone defects in primary total knee arthroplasty with cement and screws with undersizing of tibia

Background: There are several options for dealing with tibial bone defects during total knee arthroplasty in severe primary osteoarthritis. The aim of this study was to report the midterm results of TKA with screw and cement augmentation of moderate-sized tibial bone defects.Methods: Patients with osteoarthritis who had posterior stabilised TKA with screw and cement augmentation of the tibia were reviewed retrospectively. Patients were assessed preoperatively and at follow-up using the International knee society knee score and function score, and radiographic analysis of alignment and signs of loosening.Results: 60 knee in 60 patients were included in the study. The mean age was 71 years; mean follow-up was 58 months. KS improved from 46 to 76 and FS from 51 to 92. The femorotibial mechanical angle changed from 174 to 178. There were no signs of osteolysis or loosening, and no revisions. Radiolucent lines at the cement bone interface were common but non- progressive.Conclusions: Midterm clinical and radiographic results of TKA with screw and cement augmentation for moderate tibial defects were satisfactory

Comparative study between intramedullary interlocking nailing and minimally invasive percutaneous plate osteosynthesis for distal tibia extra-articular fractures

Background: Treatment of distal tibia fractures poses significant challenge to orthopedic surgeon because of poor blood supply and paucity of soft tissue coverage. There is considerable controversy regarding the superior option of treatment for distal tibia fracture between the minimally invasive percutaneous plate osteosynthesis (MIPPO) technique and intramedullary interlocking (IMIL) nailing for extra-articular distal tibia fractures. The aim of our study is to compare the functional outcome between the two treatment methods.Methods: This was the prospective comparative study of 50 patients with distal third tibia fractures divided into two groups. First group of patients were treated with MIPPO technique while second group of patients were managed by IMIL nailing. Patients were followed up in outpatient department to assess the functional outcomes, malunion, delayed union, non-union, superficial and deep infection between the two groups.Results: Average time taken by patients for full weight bearing in group A was 17.6 weeks as compared to 16.7 weeks in group B. All patients were able to bear weight prior to complete union of fracture. By the process of weight bearing, we believed that it would promote secondary bone healing. On taking X-rays during follow up of included patients starting of radiological union was observed carefully by looking for bridging callus, haziness of fracture line. Appearance of callus was taken average time of 12.5 weeks in group A and 12.1 weeks in group B.Conclusions: Both procedures have shown the reliable method of fixation for distal extra-articular tibia fractures preserving the soft tissue, bony vascularity and fracture hematoma that provide a favourable biological environment for fracture healing. Considering the results of the study, we have slightly more preference for the MIPPO technique

Intra and extraarticular localized pigmented villonodular synovitis

A 28 year old woman had a history of knee trauma and presented with unilateral knee acute swelling and pain symptoms with sudden onset, which was there from last 2 years. She had been treated for seronegative rheumatoid patient for 1 year. Recent expansion of the LPVNS (localized pigmented villonodular synovitis) caused the development of a tender palpable soft tissue mass in the anterolateral aspect of the knee and acute reduced mobility. Preoperative magnetic resonance imaging of the knee revealed the presence of only the soft tissue mass and mild degenerative changes. Open synovectomy was performed successfully to excise the mass. Intraoperatively, macroscopic features of the bright brown inflamed synovium suggested LPVNS, which was confirmed histopathologically. Postoperatively, the symptoms of limited mobility and pain were appreciably relieved. Recurrence was not observed during the clinical follow up at 1, 6 or 18 months after surgery. Here, we reported the unique case of localized pigmented villonodular synovitis of the knee in a misdiagnosed patient with intra and extraarticular lesion, which might be attributed to the history of knee trauma and the focal defect of the lateral patellar retinaculum. Open synovectomy effectively relieved the symptoms of limited mobility and pain and no recurrence was observed prior to 18 months postoperatively. To reduce misdiagnosis, MRI examinations are recommended for all patients suspected of having PVNS, including those who have a history of hyperuricemia