PURPOSE: Child head injury under impact scenarios (e.g. falls, vehicle crashes, etc.) is an important topic in the field of injury biomechanics. The head of piglet was commonly used as the surrogate to investigate the biomechanical response and mechanisms of pediatric head injuries because of the similar cellular structures and material properties. However, up to date, piglet head models with accurate geometry and material properties, which have been validated by impact experiments, are seldom. We aim to develop such a model for future research. METHODS: In this study, first, the detailed anatomical structures of the piglet head, including the skull, suture, brain, pia mater, dura mater, cerebrospinal fluid, scalp and soft tissue, were constructed based on CT scans. Then, a structured butterfly method was adopted to mesh the complex geometries of the piglet head to generate high-quality elements and each component was assigned corresponding constitutive material models. Finally, the guided drop tower tests were conducted and the force-time histories were ectracted to validate the piglet head finite element model. RESULTS: Simulations were conducted on the developed finite element model under impact conditions and the simulation results were compared with the experimental data from the guided drop tower tests and the published literature. The average peak force and duration of the guide drop tower test were similar to that of the simulation, with an error below 10%. The inaccuracy was below 20%. The average peak force and duration reported in the literature were comparable to those of the simulation, with the exception of the duration for an impact energy of 11 J. The results showed that the model was capable to capture the response of the pig head. CONCLUSION This study can provide an effective tool for investigating child head injury mechanisms and protection strategies under impact loading conditions.
Animals ; Swine ; Finite Element Analysis ; Skull/injuries* ; Craniocerebral Trauma/diagnostic imaging* ; Brain ; Biomechanical Phenomena ; Scalp

Objective: To explore the clinical effects of three-dimensional printed preformed titanium mesh combined with latissimus dorsi muscle flap free transplantation in the treatment of wounds with skull defect after radical surgery of squamous cell carcinoma in the vertex. Methods: A retrospective observational study was conducted. From January 2010 to December 2019, 5 patients with squamous cell carcinoma in the vertex accompanied with skull invasion who met the inclusion criteria were admitted to the Department of Burns and Plastic Surgery of the Second Affiliated Hospital of Air Force Medical University, including four males and one female, aged 50 to 65 years. The original lesion areas ranged from 5 cm×4 cm to 15 cm×8 cm. The titanium mesh was prefabricated via three-dimensional technic based on the result the scope of skull resection predicted with computerized tomography three-dimensional reconstruction before surgery. During the first stage, the soft tissue defect area of scalp (8 cm×7 cm to 18 cm×11 cm) after tumor enlargement resection was repaired with the preformed titanium mesh, and the titanium mesh was covered with latissimus dorsi muscle flap, with area of 10 cm×9 cm to 20 cm×13 cm. The thoracodorsal artery/vein was anastomosed with the superficial temporal artery/vein on one side. The muscle ends in the donor site were sutured together or performed with transfixion, and then the skin on the back were covered back to the donor site. On the 10th day after the first-stage surgery, the second-stage surgery was performed. The thin intermediate thickness skin graft was taken from the anterolateral thigh to cover the latissimus dorsi muscle flap. The duration and intraoperative blood loss of first-stage surgery were recorded. The postoperative muscle flap survival after the first-stage surgery and skin graft survival after the second-stage surgery was observed. The occurrence of complications, head appearance, and recurrence of tumor were followed up. Results: The average first-stage surgery duration of patients was 12.1 h, and the intraoperative blood loss was not more than 1 200 mL. The muscle flaps in the first-stage surgery and the skin grafts in the second-stage surgery all survived well. During the follow-up of 6-18 months, no complications such as exposure of titanium mesh or infection occurred, with good shape in the recipient sites in the vertex, and no recurrence of tumor. Conclusions: Three-dimensional printed preformed titanium mesh combined with latissimus dorsi muscle flap free transplantation and intermediate thickness skin graft cover is an effective and reliable method for repairing the wound with skull defect after extended resection of squamous cell carcinoma in the vertex. This method can cover the wound effectively as well as promote both recipient and donor sites to obtain good function and appearance.
Carcinoma, Squamous Cell/surgery* ; Female ; Humans ; Male ; Perforator Flap ; Reconstructive Surgical Procedures/methods* ; Scalp/surgery* ; Skin Transplantation ; Skull/surgery* ; Soft Tissue Injuries/surgery* ; Superficial Back Muscles/surgery* ; Surgical Mesh ; Titanium ; Treatment Outcome

OBJECTIVE: To observe the therapeutic effect of scalp acupuncture on cognitive dysfunction of traumatic brain injury. METHODS: Seventy patients with cognitive dysfunction of traumatic brain injury were randomly divided into an observation group and a control group, 35 cases in each group. After treatment, 5 cases dropped off in each group. The patients in the control group were treated with cognitive training; the patients in the observation group were treated with cognitive training and scalp acupuncture at Baihui (GV 20), Sishencong (EX-HN 1), Zhisanzhen and Niesanzhen, and the needles were retained for 6 h. The two groups were treated once a day, 6 times a week; one-month treatment was taken as one course, and 3 continuous courses were given. The scores of mini-mental state examination (MMSE), Montreal cognitive assessment (MoCA), activity of daily living (ADL) and functional independence measure (FIM) were compared between the two groups before and after treatment. RESULTS: Compared before treatment, the MMSE and MoCA scores in the observation group, and ADL and FIM scores in the two groups were significantly increased after treatment ( CONCLUSION Scalp acupuncture could improve cognitive function and self-care ability of daily life in patients with traumatic brain injury.
Acupuncture Points ; Acupuncture Therapy ; Brain Injuries, Traumatic/therapy* ; Cognition ; Humans ; Scalp ; Self Care

Decompressive craniectomy (DC) is commonly performed in patients with intracranial hypertension or brain edema due to traumatic brain injury. Infrequently, neurologic deteriorations accompanied by sunken scalp may occur after DC. We report two patients with traumatic subdural hemorrhage who had neurologic deteriorations accompanied by sunken scalp after DC. Neurologic function improved dramatically in both patients after cranioplasty. Monitoring for neurologic deterioration after craniectomy is advised. For patients showing neurologic deficit with a sunken scalp, early cranioplasty should be considered.
Brain Edema ; Brain Injuries ; Decompressive Craniectomy ; Hematoma, Subdural ; Humans ; Intracranial Hypertension ; Neurologic Manifestations ; Scalp ; Skin

Full-thickness scalp burns secondary to hair coloring are rare; however, such defects can be large and complex reconstruction of hair-bearing tissue may be necessary. Many skin-stretching devices that use gradual traction have been applied to take advantage of the viscoelastic properties of the skin. A 21-year-old female patient was seen with a burn defect on her occipital scalp leading to exposed subcutaneous tissue after chemical application of hair coloring in a salon. The dimensions of the wound were 10 cm×5 cm, and a skin graft or flap would have been necessary to close the defect. Two long transfixing K-wires (1.4 mm) and paired 3-wire threads (23 gauge), which are readily available in most hospitals, were applied over a period of 12 days for trichophytic closure of the defect. The remaining scalp scars after primary trichophytic closure with this skin-stretching method were refined with hair follicle transplantation. This skin-stretching method is simple to apply and valuable for helping to close problematic areas of skin shortage that would otherwise require more complicated procedures. This case shows a relatively unknown complication of hair coloring and its treatment.
Burns ; Burns, Chemical ; Cicatrix ; Female ; Hair Color ; Hair Follicle ; Hair ; Humans ; Methods ; Scalp ; Skin ; Subcutaneous Tissue ; Traction ; Transplantation ; Transplants ; Wound Healing ; Wounds and Injuries ; Young Adult

OBJECTIVE: This paper reports the possibility of using of a locking horizontal mattress suture technique in repairing lacerations that are difficult to suture with staples. METHODS: Data were collected retrospectively over a 6-month period regarding the routine repair of scalp lacerations: those in areas injured by a high energy blunt mechanism, continued to bleed after pressure, nonlinear or damaged skin repaired with a locking horizontal mattress technique, and simple interrupted technique. The effects of the two techniques used to repair scalp lacerations on wound healing, complication rate, and patient satisfaction were examined. The categorical variables are expressed as the number and percent. A Mann-Whitney-Wilcoxon test was used for statistical analysis. A P-value less than 0.05 was considered significant. RESULTS: Thirty-seven consecutive patients with scalp lacerations presented for care. Wound closure was accomplished with the locking horizontal mattress sutures in 40.5% (n=15) (median length, 5.0 cm; interquartile range [IQR], 4.0–7.0 cm). Simple interrupted sutures (median length, 4 cm; IQR, 3.0–5.0 cm) were used in 59.5% (n=22) (P=0.015). The frequency of additional bandage compression (P=0.008), frequency of exudative hemorrhage (P=0.018), and suture mark frequency at suture removal (P=0.047) were significantly lower in the locking horizontal mattress group. CONCLUSION: The locking horizontal mattress suture, which has the advantage of a horizontal mattress suture, may be one of the ways that can be used alternatively to treat scalp lacerations that difficult to suture with staples.
Bandages ; Hemorrhage ; Humans ; Lacerations* ; Methods* ; Patient Satisfaction ; Retrospective Studies ; Scalp* ; Skin ; Suture Techniques ; Sutures* ; Wound Healing ; Wounds and Injuries

Facial soft tissue injury due to trauma is common. Severe damage of soft tissue causes functional and cosmetic problems. In the initial evaluation of patients with facial trauma, airway maintenance and respiratory maintenance are the most important. The principles of treatment include adequate irrigation and debridement, primary closure, or secondary wound healing. Postoperative care such as taping, silicone gel sheeting, and sun screening is important to prevent scarring. The scalp and forehead are abundant in blood and can cause severe bleeding. The eyelid is very thin and has a multi-layered structure, requiring accurate suturing and reconstruction of the layers. It is advisable to determine the presence of hematoma in the ear and treat it. When the cheek area is damaged, it is necessary to identify and treat the damage of the parotid gland and the facial nerve branch. The lips should be sewn with the white roll of lip and vermillion.
Cheek ; Cicatrix ; Debridement ; Ear ; Eyelids ; Facial Nerve ; Forehead ; Hematoma ; Hemorrhage ; Humans ; Lip ; Mass Screening ; Parotid Gland ; Postoperative Care ; Scalp ; Silicon ; Silicones ; Soft Tissue Injuries ; Solar System ; Wound Healing ; Wounds and Injuries

PURPOSE: It is well known the advantages of scalp donor split thickness skin graft(STSG) in deep burn wound because of its scarless donor healing, and good color match in face. Inspite of the advantages of scalp as a skin donor site during split thickness skin graft some authors report the frequent postoperative folliculitis, and partial alopecia on scalp donor site. We had experienced 21 burn patients, who had full thickness skin defects caused by burn injuries, were successfully managed with scalp donor split thickness skin graft with our optimal donor management protocols. METHODS: We had 21 deep burn patients, who were managed with thin STSG from scalp donor for coverage of full thickness skin defects. The operative techniques of the harvesting scalp STSG, and scalp donor dressing care are such as followings. After the infiltration of the donor scalp area with 1:1,000,000 epinephrine diluted with saline, then usually 0.012~0.015 inch thickness skin were harvested with air driven Zimmer® dermatome. On postoperative 6days, the one layer of adhered Vaseline gauze at donor scalp site was manually removed, and the entire scalp was cleansed with water. After then the daily hair washing was continued to remove the desiccated scaly crust with thick exudate at the growing hair and follicle. RESULTS: The scalp split thickness skin graft at the recipient sites in 21 burn patients were survived completely. Ranges of patient's age were 8 months to 56. The size ranges of scalp STSG were 2×2 cm~12×15 cm. The grafted scalp donor STSG were survived in all cases. The mean epithelialization period of scalp donor was 7.2 days. The one case of transient folliculitis (5%) from the postoperative 8days was occurred, and it was disappeared slowly with vigorous daily hair washing, antiseptics and systemic antibiotics. In all cases, there was no micro-alopecia or alopecia, and scars in scalp donor after follow ups. The donor site pain was markedly disappeared within 1~2 postoperative day. The hemorrhage from the scalp donor site during operation was not noticeable. The newly growing hair at the scalp donor was noted from the 3 postoperative days by palpation or unaided eye through the Vaseline gauze dressing. The average lengths of newly growing hair shaft are 2~3 mm in postoperative 8 days, 5~6 mm in postoperative 14 days. CONCLUSION: We had successful reconstruction of postburn skin defects using scalp donor split thickness skin graft without donor scars, persistent folliculitis or alopecia on scalp donor. From the postoperative 6~7 days after harvesting the scalp donor STSG, early vigorous daily washing with water and open dressing of scalp donor site should be recommended in order to prevent folliculitis. After long-term follow ups, the scalp split skin grafted recipient sites showed reliable, and relatively good color match with surrounding skin in face and dorsum of hand.
Alopecia ; Anti-Bacterial Agents ; Anti-Infective Agents, Local ; Bandages ; Burns* ; Cicatrix ; Epinephrine ; Exudates and Transudates ; Folliculitis ; Follow-Up Studies ; Hair ; Hand ; Hemorrhage ; Humans ; Palpation ; Petrolatum ; Scalp* ; Skin* ; Tissue Donors* ; Transplants* ; Water ; Wounds and Injuries

BACKGROUND: To know the difference between single and double-layer wound closure. METHODS: The study was conducted in ten patients undergoing first session of hair restoration surgery by ‘strip method’ under local anaesthesia. Informed consent was obtained from all the patients. The length and width of the strip were marked pre-operatively. Three points were marked, one in the midline ‘O’ and one on either side, ‘A’&‘B’ at 8 cm from ‘O’. After removing the strip, five deep, interrupted, absorbable sutures were applied on left half but not on the right half. Lower edge trichophytic closure was performed with no undermining of the skin edges. A single continuous non-absorbable sutures was used to close the skin. The stitches were removed on the 10th postoperative day. The patients were assessed at 9 months interval postoperatively. RESULTS: The mean age of the patients was 33.8 years. The average width of the strip removed was 15.1 mm. The average width of the scar on single-layer closure was 1.57 mm and 1.58 mm on the double-layer closure. The mobility of the scar was 7.9 mm on single-layer closure and 6.2 mm on double-layer closure. There was no statistical significance in the scar size and mobility of single-layer vs double-layer closure. The time of surgery was more in double-layer closure and the extra cost of the suture material. CONCLUSIONS: There was no difference in scar quality. The extra time and money was saved in single-layer closure. The mobility of the scar was also found to be better in single-layer closure.
Cicatrix ; Hair ; Humans ; Informed Consent ; Scalp* ; Skin ; Suture Techniques ; Sutures ; Tissue Donors* ; Wounds and Injuries*

We present the case of a 33-year-old man who experienced a 10,000-V electrical shock when working with electrical wiring. He suffered third-degree burns on his scalp at the right occiput (entry wound) and on his left arm (exit would), and a second-degree burn on his left foot (exit wound). He presented with severe spasticity of both lower extremities, motor weakness with a Medical Research Council grade of 3, and sensory impairments below thoracic level 11 that included an inability to sense light touch and defects in proprioception. Initial magnetic resonance imaging (MRI) scans of his spine and brain showed no definite abnormalities. However, tractography obtained by diffusion tensor imaging of the brain showed absence of the right medial lemniscus tract. A cervical MRI scan 1 month later showed spinal cord swelling from cervical 1-5 levels, and signal changes in the lateral and posterior white matter in the axial view. After 6 months of rehabilitation, he recovered almost normal degree of motor function in his lower extremities and disappearance of spasticity. However, since the sensory impairments persisted, especially defects in proprioception, he was unable to walk independently.
Adult ; Arm ; Brain ; Burns ; Diffusion Tensor Imaging ; Electric Injuries ; Electric Wiring ; Foot ; Humans ; Lower Extremity ; Magnetic Resonance Imaging ; Muscle Spasticity ; Proprioception ; Rehabilitation ; Scalp ; Shock ; Spinal Cord ; Spine ; White Matter