Acromioplasty during repair of rotator cuff tears removes only half of the impinging acromial bone.

To date, there is no consensus on when and how to perform acromioplasty during rotator cuff repair (RCR). We aimed to determine the volume of impinging bone removed during acromioplasty and whether it influences postoperative range of motion (ROM) and clinical scores after RCR. Preoperative and postoperative computed tomography scans of 57 shoulders that underwent RCR were used to reconstruct scapula models to simulate volumes of impinging acromial bone preoperatively and then compare them to the volumes of bone resected postoperatively to calculate the proportions of desired (ideal) vs. unnecessary (excess) resections. All patients were evaluated preoperatively and at 6 months to assess ROM and functional scores. The volume of impinging bone identified was 3.5 ± 2.3 cm <sup>3</sup> , of which 1.6 ± 1.2 cm <sup>3</sup> (50% ± 27%) was removed during acromioplasty. The volume of impinging bone identified was not correlated with preoperative critical shoulder angle (r = 0.025, P = .853), nor with glenoid inclination (r = -0.024, P = .857). The volume of bone removed was 3.7 ± 2.2 cm <sup>3</sup> , of which 2.1 ± 1.6 cm <sup>3</sup> (53% ± 24%) were unnecessary resections. Multivariable analyses revealed that more extensive removal of impinging bone significantly improved internal rotation with the arm at 90° of abduction (beta, 27.5, P = .048) but did not affect other shoulder movements or clinical scores. Acromioplasty removed only 50% of the estimated volume of impinging acromial bone. More extensive removal of impinging bone significantly improved internal rotation with the arm at 90° of abduction

HUMAN4D: A human-centric multimodal dataset for motions and immersive media

We introduce HUMAN4D, a large and multimodal 4D dataset that contains a variety of human activities simultaneously captured by a professional marker-based MoCap, a volumetric capture and an audio recording system. By capturing 2 female and 2 male professional actors performing vari

A collaborative VR Murder Mystery using Photorealistic User Representations

The VRTogether project has developed a Social VR platform for remote communication and collaboration. The hyper-realistic representation of users, as volumetric video, allows for natural interaction in a virtual environment with others. This video shows one of the use cases, an escape room style, where remote users need to collaboratively resolve a murder mystery. The experience takes place in the victim’s apartment where the police team (avatars) together with up to four real-time captured users (point clouds), work as a team to find clues and come up with a conclusion about what happened to the victim and who was the criminal. This experience includes a layer of interaction, enabling the users to interact with the environment, by touching objects, and to talk to the characters. It also allows for navigating between the rooms of the apartment. The experience provides immersion and social connectedness, where users are protagonists of the story, sharing the virtual environment and following the narrative. The combination of virtual reality environments (space and characters) with novel technologies for real-time volumetric video conferencing enables unique new experiences in a number of areas such as healthcare, broadcasting, and gaming. The video can be watched here: https://youtu.be/Hsj1YWo55k

ArthroPlanner: a surgical planning solution for acromioplasty.

We present a computer-assisted planning solution "ArthroPlanner" for acromioplasty based on 3D anatomical models, computed tomography and joint kinematic simulations. In addition to a standard static clinical evaluation (anamnesis, radiological examination), the software provides a dynamic assessment of the shoulder joint by computing in real time the joint kinematics from a database of activities of daily living. During motion, the precise bone resection (location and amount) is computed based on detected subacromial impingements, providing surgeons with precise information about the surgical procedure. Moreover, to improve the subjective reading of medical images, the software provides 3D measurement tools based on anatomical models assisting in the analysis of shoulder morphological features. We performed an in vivo assessment of the software in a prospective randomized clinical study conducted with 27 patients beneficiating from the planning solution and a control group of 31 patients without planning. Postoperatively, patient's pain decreased, and the shoulder range of motion and the functional outcomes improved significantly and the rotator cuff healing rate was good for both groups without intergroup differences. The amount of bone resected at surgery was comparable between the groups. The percentage of remaining impingement after surgery was in average reduced to 51% without groups difference. ArthroPlanner software includes all required materials (images data, 3D models, motion, morphological measurements, etc.) to improve orthopedists' performance in the surgical planning of acromioplasty. The solution offers a perfect analysis of the patient's anatomy and the ability to precisely analyze a dynamic mechanism to fully apprehend the patient's condition and to fulfill his/her expectations. The study however failed to detect any statistically significant difference in clinical outcomes and bone resection between the groups. Short-term clinical and radiological results were excellent in both groups

Guided versus freehand acromioplasty during rotator cuff repair. A randomized prospective study.

There is no consensus on how to perform acromioplasty, particularly regarding the level and extent of bone resection, which depend on scapular and humeral morphologies. We aimed to determine whether computer-assisted acromioplasty planning helps surgeons remove impinging bone, reduce unnecessary resections, and improve short-term outcomes of rotator cuff tears (RCR). We randomized 64 patients undergoing RCR of full-thickness supraspinatus tears into two groups: 'guided acromioplasty' (GA) and 'freehand acromioplasty' (FA). The pre- and post-operative scapula models were reconstructed using computed-tomography scans to quantify impinging bone removal, unnecessary bone resections, and identify zones of acromial bone removal. All patients were evaluated preoperatively and at 6 months to assess their range of motion (ROM), functional scores and tendon integrity using ultrasound. The two groups did not differ in demographics, clinical or morphologic characteristics. Compared to FA, GA tended to lower impinging bone removal (55±26% vs. 43±27%, p=0.087) and to increase unnecessary resection of the total bone removed (49±22% vs. 57±27%, p=0.248). GA resulted in significant anterior under-resection, while FA resulted in significant medial over-resection. Clinical outcomes and ROM improved significantly for all patients, except for internal rotation in the GA group. There were no other significant differences between the two groups, neither in terms of post-operative scores nor in terms of clinical net improvements, nor tendon repair integrity. This computer-assisted planning for acromioplasty during RCR proved no benefits in terms of bone removal, tendon healing, or clinical outcomes. Nonetheless such planning tools could help less experienced surgeons improve the efficacy of acromioplasty. I, Randomized controlled trial (Therapeutic study)

Pomp Accumulatie Centrale Noordzeekust: Deelrapportage Fase 1 Morfologie

Het kustmorfologisch onderzoek van de varianten moest beperkt blijven door het krappe tijdschema. Er is derhalve selectief gebruik gemaakt van de tegenwoordig beschikbare geavanceerde kustmorfologische rekenmodellen. Voor deze fase waarin de voorgestelde varianten tot een niveau van een studie-ontwerp worden uitgewerkt, wordt dat voldoende geacht. De indeling is verder als volgt: hoofdstuk 2 vormt de samenvatting van de belangrijkste resultaten en de hoofdconclusies. De eerder genoemde selectie van voorkeursgebieden wordt vervolgens beschreven in hoofdstuk 3, waarna in hoofdstuk 4 de beschrijvingen worden gegeven van de huidige situatie van de drie gebieden. Bovendien wordt hier zo veel mogelijk aangegeven wat naar verwachting de morfologische ontwikkeling in deze gebieden zal zijn indien er geen Pomp Accumulatie Centrale gerealiseerd wordt. Deze laatste ontwikkeling kan dan als referentiekader dienen voor de te verwachten effecten van een Pomp Accumulatie Centrale. In hoofdstuk 5 worden daarna de gehanteerde uitgangspunten op een rij gezet en worden enkele beschouwingen over de vorm en de belijning gegeven alsmede de randvoorwaarden zoals deze voor de drie voorkeursgebieden zijn verkregen uit de verzamelde gegevens. In hoofdstuk 6 staat vermeld op welke wijze vanuit de randvoorwaarden is gekomen tot een bepaling van de hydraulische omstandigheden voor situaties met en zonder Pomp Accumulatie Centrale; tevens wordt een korte beschrijvinq qegeven van de gebruikte rekenmodellen. In hoofdstuk 7, Kustverdediqingen, wordt aangegeven waar naar morfologische inzichten bodemverdedigingen toegepast zullen moeten worden en hoever deze zich uitstrekken. Tevens worden in dit hoofdstuk voor de zandige vooroever de berekende onderhoudshoeveelheden vermeld voor de verschillende locaties, waarbij kort wordt aangeqeven welke rekenmodellen zijn gehanteerd. Hoofdstuk 8 betreft de additionele ontwerpelementen welke een relatie hebben met kustmorfologische elementen. In hoofdstuk 9 komen de uitvoeringsaspecten aan de orde, waarbij vooral aandacht wordt geschonken aan het bouwen met zand. Hoofdstuk 10 behandelt de morfoloqische effecten van een Pomp Accumulatie Centrale op de voorgestelde locaties tijdens de bouw, tijdens de procesgang en op langere termijn. Tevens is aangegeven wat de verwachtinqen zijn indien zich andere omstandigheden voordoen.PA