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Objective: To investigate the effectiveness of channel screw combined with skin-stretching technique in treatment of pelvic fracture with severe Morel-Lavallée lesion., Methods: Between January 2017 and May 2020, 11 patients with pelvic fractures complicated with severe Morel-Lavallée lesions were treated with channel screw combined with skin-stretching technique. There were 8 males and 3 females, with an average age of 39.2 years (range, 28-58 years). Causes of injury included traffic accident in 9 cases and falling from hight in 2 cases. The time from injury to hospital admission ranged from 1 to 6 days (mean, 3.7 days). According to the Tile classification, the pelvic fractures were rated as type C1 in 7 cases, type C2 in 3 cases, and type C3 in 1 case. The sites of Morel-Lavallée lesions were buttocks in 8 cases, hips in 2 cases, and thigh in 1 case. There was 1 case of rectal injury, 1 case of splenic rupture, 3 cases of craniocerebral injury, 2 cases of chest injury, 4 cases of spinal fracture, and 6 cases of sacral nerve injury. X-ray films were performed to observe reduction and healing of fracture. The quality of fracture reduction was evaluated by Matta standard at 1 week after operation. Wound healing and complications were observed. Majeed scoring was used to evaluate hip function and Gibbons sacral nerve injury grading was used to evaluate neurological function recovery., Results: The patients underwent 4-7 operations, with an average of 5.8 operations. The time of first operation (pelvic fracture fixation, debridement, and skin distractor installation) was 115-275 minutes, with an average of 186.5 minutes. The amount of intraoperative blood loss was 30-80 mL, with an average of 45.5 mL. All patients were followed up 6-12 months, with an average of 8.3 months. The quality of fracture reduction according to the Matta standard was excellent in 7 cases, good in 2 cases, and fair in 2 cases, with an excellent and good rate of 81.8%. All fractures healed at 3-6 months after operation, with an average of 4.5 months. At last follow-up, the hip functions were excellent in 7 cases and good in 4 cases according to Majeed scoring, with an excellent and good rate of 100%. Among the 6 patients complicated with sacral nerve injury, the Gibbons sacral nerve injury grading reached gradeⅠ for 4 cases, gradeⅡ for 1 case, and grade Ⅲ for 1 case. The wounds of 9 cases were sutured directly after skin-stretching treatment for 25-32 days, with an average of 28 days. The dermal edge necrosis occurred in 1 case, and the defect was repaired by free skin grafting. The skin superficial dry necrosis of the wound occurred in 1 case, and healed by dressing change., Conclusion: In the treatment of pelvic fracture complicated with severe Morel-Lavallée lesion, the channel screw and skin-stretching technique showed their own advantages, which can obtain early fracture fixation and good wound healing.

Objective: To investigate the effectiveness of channel-assisted minimally invasive repair system (CAMIR) in treatment of the Myerson types Ⅰ and Ⅱchronic Achilles tendon rupture., Methods: Between May 2016 and August 2017, 19 patients with Myerson types Ⅰ and Ⅱchronic Achilles tendon ruptures were treated with CAMIR. There were 14 males and 5 females, aged from 21 to 48 years, with an average age of 34.5 years. The disease duration was 5-9 weeks (mean, 7.5 weeks). The preoperative Thompson tests of affected ankles showed positive. There were 11 cases of Myerson type Ⅰwith the gaps of Achilles tendon defect of 1-2 cm (mean, 1.58 cm), and 8 cases of Myerson type Ⅱwith the gaps of Achilles tendon defect of 2.5-4.0 cm (mean, 3.16 cm). The ankle dorsiflexion and plantarflexion range of motion were measured before and after operation; the American Orthopedic Foot and Ankle Society (AOFAS) ankle and hindfoot score was used to assess the patients' ankle joint function., Results: No major blood vessels, nerves, and other tissue structures were damaged during the operation; 3 cases of Myerson type Ⅰ were converted to Myerson type Ⅱ according to the gaps of the defect after the scar tissue was removed during the operation. After operation, the depressed part of the Achilles tendon disappeared, the continuity of the tendon was restored, and the Thompson tests were negative. All 19 patients were followed up 12-25 months, with an average of 14 months. All incisions healed by first intention, and no infection and skin necrosis occurred; all the pre-injury activities and exercise were restored at 6 months after operation. During the follow-up period, no heel pain or re-rupture occurred. At last follow-up, except that there was no significant difference in ankle dorsiflexion range of motion of Myerson type Ⅰ patients ( t =2.118, P =0.071), the AOFAS ankle and hindfoot score, ankle plantarflexion range of motion of Myerson types Ⅰ and Ⅱ patients, and ankle dorsiflexion range of motion of Myerson type Ⅱ patients were significantly improved when compared with preoperative values ( P <0.05). According to AOFAS ankle and hindfoot function score, the ankle joint function of type Ⅰ patients was excellent in 7 cases and good in 1 case, and of type Ⅱ patients were excellent in 8 cases, good in 2 cases, and fair in 1 case., Conclusion: CAMIR is safe and effective in the treatment of Myerson types Ⅰ and Ⅱ chronic Achilles tendon rupture with fewer complications and better functional recovery of ankle joint.

Objective: To investigate the effectiveness of three-dimensional (3D) navigation template in the adult cubitus varus osteotomy., Methods: Between April 2013 and September 2015, 17 patients with cubitus varus were admitted. There were 6 males and 11 females, aged from 19 to 38 years, with an average age of 26.9 years. There were 10 cases of left elbow joints and 7 cases of right elbow joints. The disease duration was 9-30 years (mean, 18 years). Based on the preoperative X-ray film, the humerus-elbow-wrist (HEW) angle was (-13.2 ±3.3)°, the anteversion angle was (-10.5±2.3)°. The preoperative range of motion (ROM) of flexion was (127.3±7.3)° and ROM of extension was (-10.0±2.5)°. Based on the CT 3D reconstruction, the osteotomy navigation template was designed and printed by 3D printing technique. The cubitus varus osteotomy was assisted by 3D navigation template. The postoperative HEW angle, anteversion angle, and ROMs of the elbow joints of both sides were measured. The elbow function was evaluated based on the Oppenheim elbow function score at 1 year after operation., Results: All cubitus varus osteotomies succeeded with the assist of 3D navigation template. All incisions healed by first intention. All patients were followed up 12-15 months (mean, 13 months). X-ray films showed that all osteotomies healed after 9-12 weeks (mean, 11 weeks). At 1 year after operation, the HEW angle was (9.7±1.9)°, the anteversion angle was (20.7±4.3)°, the ROM was (2.6±3.5)° in extension and (139.2±4.8)° in flexion of affected side. The HEW angle, anteversion angle, and ROMs significantly increased compared with preoperative values ( P <0.05). And there was no significant difference between affected and normal elbow joints ( P >0.05). The elbow functions were excellent in 13 cases and good in 4 cases based on the Oppenheim elbow function score at 1 year after operation. There was no complication such as the nerve injury or osteomyositis of elbow joint during follow-up., Conclusion: The 3D navigation template can provide a personalized and precise osteotomy treatment for adult cubitus varus deformity and obtain a satisfactory effectiveness.