Does Demineralized Bone Matrix Enhance Tendon-to-Bone Healing after Rotator Cuff Repair in a Rabbit Model?

Background@#The purpose of this study was to compare the histologic outcomes of rotator cuff (RC) repair with demineralized bone matrix (DBM) augmentation and those without DBM augmentation and to evaluate the role of DBM for tendon-to-bone (TB) healing in a rabbit model. @*Methods@#Twenty-six adult male New Zealand white rabbits were randomly allocated to the control group (n = 13) or the DBM group (n = 13). Repair was performed 8 weeks after complete transection of the right supraspinatus tendon of all rabbits. In the control group, RC repair was achieved by a standard transosseous technique. In the DBM group, RC repair was achieved using the same technique, and DBM was interposed between the cuff and bone. After 8 weeks, the RC tendon entheses from all rabbits were processed for gross and histologic examination. @*Results@#On gross TB healing, 2 of 11 specimens in the control group were unhealed and no specimen was grossly unhealed in the DBM group (p = 0.421). In the control group, the tendon midsubstance was disorganized with randomly and loosely arranged collagen fibers and rounded fibroblastic nuclei. The TB interface was predominantly fibrous with small regions of fibrocartilage, especially mineralized fibrocartilage. In the DBM group, the tendon midsubstance appeared normal and comprised densely arranged collagen fibers, with orientated crimped collagen fibers running in the longitudinal direction of the tendon. These fibers were interspersed with elongated fibroblast nuclei. The TB interface consisted of organized collagen fibers with large quantities of fibrocartilage and mineralized fibrocartilage. @*Conclusions@#The use of DBM for TB interface healing in rabbit experiments showed good results in gross and histologic analysis. However, it is difficult to draw a solid conclusion because the sample size is small. Further evaluation in the in vivo setting is necessary to determine clinical recommendations.

Does Demineralized Bone Matrix Enhance Tendon-to-Bone Healing after Rotator Cuff Repair in a Rabbit Model?

Background@#The purpose of this study was to compare the histologic outcomes of rotator cuff (RC) repair with demineralized bone matrix (DBM) augmentation and those without DBM augmentation and to evaluate the role of DBM for tendon-to-bone (TB) healing in a rabbit model. @*Methods@#Twenty-six adult male New Zealand white rabbits were randomly allocated to the control group (n = 13) or the DBM group (n = 13). Repair was performed 8 weeks after complete transection of the right supraspinatus tendon of all rabbits. In the control group, RC repair was achieved by a standard transosseous technique. In the DBM group, RC repair was achieved using the same technique, and DBM was interposed between the cuff and bone. After 8 weeks, the RC tendon entheses from all rabbits were processed for gross and histologic examination. @*Results@#On gross TB healing, 2 of 11 specimens in the control group were unhealed and no specimen was grossly unhealed in the DBM group (p = 0.421). In the control group, the tendon midsubstance was disorganized with randomly and loosely arranged collagen fibers and rounded fibroblastic nuclei. The TB interface was predominantly fibrous with small regions of fibrocartilage, especially mineralized fibrocartilage. In the DBM group, the tendon midsubstance appeared normal and comprised densely arranged collagen fibers, with orientated crimped collagen fibers running in the longitudinal direction of the tendon. These fibers were interspersed with elongated fibroblast nuclei. The TB interface consisted of organized collagen fibers with large quantities of fibrocartilage and mineralized fibrocartilage. @*Conclusions@#The use of DBM for TB interface healing in rabbit experiments showed good results in gross and histologic analysis. However, it is difficult to draw a solid conclusion because the sample size is small. Further evaluation in the in vivo setting is necessary to determine clinical recommendations.

Midterm-clinical Outcomes after Hip Arthroscopy in Middle-aged Patients with Early Osteoarthritis / 대한고관절학회지

PURPOSE: Although the number of hip arthroscopies is rapidly increasing in non-elderly patients, outcomes of this procedure in middle-aged patients are not well documented or clearly understood. The purpose of this study was to evaluate the clinical and radiological outcomes after hip arthroscopy in middle-aged patients with early osteoarthritis.MATERIALS AND METHODS: This retrospective study analyzed 189 patients with early osteoarthritis of various diagnoses aged 40 years or older who underwent hip arthroscopy between January 2010 and December 2015. Clinical (e.g., modified Harris hip score [mHHS], hip outcome score-activities of daily living [HOS-ADL], visual analogue scale [VAS] for pain, range of motion) and radiological (change of Tönnis grade) outcomes were assessed at a minimum of 3-year follow-up.RESULTS: The mean preoperative and final mHHS and HOS-ADL improved from 61.2 and 60.6 to 79.5 and 81.8, respectively, while the VAS pain score decreased from 6.3 to 3.2 (P<0.001). Although the mean range of internal rotation and flexion increased from 14.2 and 100.7° preoperatively to 30.4 and 110.6° at 1-year postoperatively, they decreased slightly to 27.4 and 105.4° at the final follow-up, respectively. Eight cases (4.2%) underwent revision arthroscopic surgery and three cases (1.6%) were converted to total hip arthroplasty.CONCLUSION: Patients with early-stage osteoarthritis of various diagnoses achieved improved clinical outcomes. Therefore, using hip arthroscopy in middle-aged patients with early osteoarthritis, it is possible to achieve good surgical options.

Pathological Fracture of the Femoral Neck due to Tophaceous Gout: An Unusual Case of Gout / 대한고관절학회지

A 48-year-old man visited the emergency room with right hip pain that started abruptly while walking out of the bathroom. Computed tomography showed an intraosseous mass in the femoral neck. The patient had a 15-year history of gout and had numerous bilateral tophi in his hands, feet, knees, and elbows. After operation, we diagnosed a pathological fracture due to intraosseous tophi. Patients with hip pain who have many subcutaneous tophi and long-standing gout should be diagnosed carefully. Peri-hip joint pain caused by gout is uncommon, however, if a patient complains of pain, a simple X-ray may be required. If intraosseous tophi are present, appropriate treatment (e.g., strict hyperuricemia control with or without prophylactic internal fixation), may be required before fracture occurs.

Arthroscopic Treatment for Femoroacetabular Impingement with Extraspinal Diffuse Idiopathic Skeletal Hyperostosis

BACKGROUND: Patients with extraspinal diffuse idiopathic skeletal hyperostosis (DISH) involving the hip joint have symptoms like femoroacetabular impingement (FAI). To date, no reported study has determined the clinical outcomes of arthroscopic treatment in extraspinal DISH involving the hip joint. METHODS: A total of 421 hips with FAI that underwent arthroscopic treatment were reviewed retrospectively. We determined the extraspinal involvement of DISH with three-dimensional computed tomography (3D-CT) and simple radiography of the pelvis and hip joint. Clinical outcomes were evaluated at a minimum of 2 years postoperatively. The visual analog scale score (VAS), modified Harris hip score (MHHS), and hip outcome score–activity of daily living scale (HOS-ADL) were used, and hip range of motion (ROM) was evaluated pre- and postoperatively and at the time of the final follow-up. RESULTS: Among the 421 hips (372 patients) with FAI that underwent arthroscopic treatment, 17 hips (12 patients, 4.04%) had extraspinal DISH on the hip joints. The mean age of the patients was 51.5 years. The 3D-CT scans and simple radiographs showed extraspinal DISH on multiple points around the pelvis and hip joint. Nine of the 17 hips (seven of 12 patients) had spinal DISH. At the final follow-up, VAS, MHHS, and HOS-ADL improved significantly from 6.5, 65.3, and 66.6, respectively, to 1.2, 87.8, and 89.5, respectively, and hip flexion and internal rotation improved significantly from 97.7° and 7.9°, respectively, to 117.1° and 18.2°, respectively. CONCLUSIONS: This study has demonstrated that extraspinal DISH involving the hip joint could lead to FAI, and arthroscopic treatment could result in relief of symptoms, including pain and ROM limitation, in extraspinal DISH patients.

Surgical Outcomes of the Reinforcing Technique of a Weakened Medial Capsule in Severe Hallux Valgus Using Internal Brace / 대한족부족관절학회지

PURPOSE@#This study evaluated the clinical and radiological results after reinforcement of the weakened medial joint capsule using Internal Brace (Arthrex) for treating severe hallux valgus.@*MATERIALS AND METHODS@#This study reviewed 56 cases of 50 patients that were followed-up postoperatively for at least 12 months, from September 2017 until August 2018. An extended distal chevron osteotomy combined with a distal soft-tissue release was performed by a single surgeon to treat severe hallux valgus. Internal Brace was applied in 12 cases (group A) who had weakened medial joint capsules, and capsulorrhaphy was performed in 44 cases (group B), and these two groups were compared postoperatively for the clinical and radiological results. The postoperative complications were also investigated.@*RESULTS@#No significant differences at 1-year follow-up on the Manchester-Oxford Foot Questionnaire and the patients' satisfaction scores were found between the two groups (p=0.905 and p=0.668, respectively). For the radiology, the changes of the values between before surgery and at 1-year follow-up according to the group showed no significant differences in the hallux valgus angle, intermetatarsal angle, and the hallux interphalangeal angle (p=0.986, p=0.516, p=0.754, respectively). Recurrence of hallux valgus was reported in two cases in group A, and in three cases in group B. Transfer metatarsalgia occurred in 4 cases in group B.@*CONCLUSION@#Based on these results, we recommend the capsule reinforcing technique using Internal Brace as a successful operative option for treating a weakened medial capsule in patients with severe hallux valgus.

Intraoperative Ultrasound-Guided Percutaneous Repair of a Ruptured Achilles Tendon: A Comparative Study with Open Repair / 대한정형외과학회잡지

PURPOSE: To compare the clinical outcomes of ultrasound-guided percutaneous repair (USPR) and open repair in a ruptured Achilles tendon. MATERIALS AND METHODS: The outcomes of 12 patients with USPR (group A) and 18 patients with open repair (group B) from January 2015 to February 2017 were analyzed retrospectively. The postoperative clinical evaluations were performed using the Arner-Lindholm scale, American Orthopedic Foot and Ankle Society (AOFAS) ankle-hindfoot score, Achilles tendon total rupture score (ATRS), and visual analogue scale for the overall satisfaction and cosmetic satisfaction with the scar, and the starting time of single heel raises. The complications were also evaluated. RESULTS: The Arner-Lindholm scale, AOFAS ankle-hindfoot score, ATRS, starting time of single heel raises were similar in both groups (all p>0.05). Group A showed a significantly higher overall patient's satisfaction and cosmetic satisfaction in than group B (all p < 0.05). Two cases of Achilles tendon elongation were encountered in group A, and 1 case of re-rupture with deep infection and 1 case of superficial infection were experienced in group B. CONCLUSION: USPR showed good clinical outcomes and high satisfaction as well as a low rate of complications, such as sural nerve injury. Therefore, USPR can be considered as an effective surgical treatment option for Achilles tendon ruptures.

Radiological and Clinical Effectiveness of a Novel Calcaneal Fracture Brace after Intra-articular Calcaneal Fracture Surgery

BACKGROUND: After calcaneal fracture surgery, a short leg splint and cast are typically applied. However, these restrict joint exercises, which is inconvenient for patients. In addition, there is a risk of complications, such as pressure ulcers or nerve paralysis with a short leg cast. In this study, we evaluated clinical and radiological outcomes of the use of a specially designed calcaneal brace after calcaneal fracture surgery. METHODS: From among patients who underwent open reduction and internal fixation for calcaneal fracture between July 9, 2013 and May 31, 2017, 102 patients who wore a calcaneal fracture brace (group A) and 82 patients who wore a postoperative short leg cast (group B) were randomly chosen for this study. Radiological changes and clinical factors were compared between the two groups. After swelling at the surgical site decreased, a special calcaneal brace was applied to patients in group A. They were allowed to perform early weight bearing and joint motion. Patients in group B were immobilized in a short leg cast and were told to avoid weight bearing for 6 weeks. In each group, the Böhler's angle and Gissane's angle were measured and compared using postoperative and final follow-up radiographs. Pain (measured using a visual analogue scale [VAS]) and ankle joint range of motion (dorsiflexion, plantar flexion, eversion, and inversion) were measured serially until the final follow-up visit. RESULTS: There were no significant differences in the Böhler's angle or Gissane's angle between the two groups as measured postoperatively and at the final follow-up (paired t-test). Differences in the VAS pain score and eversion were also statistically nonsignificant between the two groups. However, group A had a significantly higher range of dorsiflexion (p = 0.021), plantar flexion (p = 0.012), and inversion (p = 0.045) of the ankle than group B (independent t-test). CONCLUSIONS: Application of the calcaneal fracture brace after open reduction and internal fixation of a calcaneal fracture not only maintained the fracture reduction but allowed for greater joint motion than the short leg cast. Thus, the calcaneal fracture brace can be considered an effective postoperative management option that enables early resumption of daily activities and facilitates postoperative joint motion.

Morphologic Changes of Femoral Cam Lesion after Osteoplasty for Femoroacetabular Impingement / 대한정형외과학회잡지

PURPOSE: We evaluated the morphologic change of cam lesion of femoroacetabular impingement (FAI) using 3-dimensional computed tomography (3D-CT) at the minimum 2-year follow-up and estimated its relationship with clinical outcomes. MATERIALS AND METHODS: Between February 2007 and March 2014, all patients who underwent hip arthroscopic femoroplasty under the impression of FAI were retrospectively evaluated. We selected patients who received 3D-CT and were followed-up for more than 2 years. We estimated the quantitative volume of femoroplasty, alpha angle and femoral head-neck offset using 3D-CT. RESULTS: Thirty-two patients (37 cases) were selected in our study. The mean age was 31.2 years (16–69 years) and the mean follow-up duration was 47.3 months (26–119 months). The mean resection volume measured after femoroplasty using 3D-CT was 48.9 mm2 (13.2–106.4 mm2), and follow-up mean resection volume was 37.9 mm2 (7.83–90.37 mm2). A little bit of the mean volumatic overgrowth of the resection area between immediate postoperative and last follow-up was shown; however, there was no statistically significant difference in the mean values (p>0.05). The clinical outcomes showed a significant improvement during the perioperative and follow-up periods in all categories (p < 0.05). CONCLUSION: There was no significant regrowth of cam lesion after femoroplasty for FAI at maximum 9 years. Moreover, in most cases, clinical outcomes were improved. This suggests that we were able to achieve good clinical outcomes without harmful anatomical regrowth of cam deformity using arthroscopic femoroplasty.

Ultrasound-Guided Regional Nerve Block in Below-Knee Amputation / 대한정형외과학회잡지

PURPOSE: This study compared the clinical results of an ultrasound (US)-guided regional nerve block with those of general anesthesia in below-knee amputation (BKA) surgery. In addition, the 1-year mortality rate of BKA patients was evaluated in relation to the preoperative comorbidity and postoperative hemoglobin level. MATERIALS AND METHODS: Among 47 patients who underwent BKA between January 2011 and August 2016, 18 patients in the US-guided regional nerve block group (group 1) and 29 patients in the general anesthesia group (group 2) were analyzed retrospectively and compared. For the clinical assessment, the 30-day mortality, 1-year mortality, postoperative hemoglobin level, and postoperative complications of both groups were investigated. The visual analogue scale (VAS) pain scores at postoperative 1, 6, and 12 hours for both groups were evaluated. The 1-year mortality of BKA patients was also evaluated in relation to the preoperative comorbidity and postoperative hemoglobin level (hemoglobin < 7 g/dl). RESULTS: Significant differences in the 30-day mortality were observed between the two groups (p=0.023). Group 1 showed a higher 30-day mortality but the 1-year mortality was similar in both groups (p=0.051). The postoperative hemoglobin level was similar in the two groups (p=0.085). The VAS pain scores for the postoperative 1-hour and 6-hour differed significantly between the two groups (p < 0.001). The VAS pain scores for postoperative 12-hour showed no significant difference (p=0.10). The 1-year mortality rate of both groups was not affected by hypertension, diabetes mellitus, arteriosclerosis obliterans, and postoperative hemoglobin less than 7 g/dl, but was affected by chronic kidney disease (CKD) (Pearson's chi-square=14.39, p < 0.05). CONCLUSION: Although US-guided regional nerve block showed comparable 1-year mortality and postoperative hemoglobin levels compared to general anesthesia in BKA, it showed better results in postoperative 1, 6 hour pain control than general anesthesia. The 1-year mortality of BKA was affected by CKD. Therefore, careful consideration is needed for patients with CKD before undergoing BKA regardless of the anesthetic methods.

The Efficacy of Different Ropivacaine Concentrations (0.5%, 0.6%, vs . 0.75%) for Regional Nerve Block in Lower Extremity: A Prospective Randomized Controlled Trial / 대한정형외과학회잡지

PURPOSE: There have only been a few studies on optimal usage of injection material in the regional nerve block for lower extremity operations. The purpose of this study was to evaluate the efficacy of different concentrations of ropivacaine. MATERIALS AND METHODS: A total of 339 patients underwent lower extremity surgery under ultrasound-guided nerve block (combined femoral and sciatic nerve block) at a Chungnam National University Hospital between March 2016 and February 2017 and were randomly assigned to three groups: Group A (0.5%, 44 ml), group B (0.6%, 30 ml), and group C (0.75%, 30 ml). The interval between nerve block procedure and onset of the complete anesthetic effect (complete anesthetic time) was investigated. The degrees of intraoperative pain, and postoperative pain were evaluated using a visual analogue scale (VAS) score. Patient's satisfaction (0–10) was investigated. To evaluate the efficacy in accordance with the concentration under the same dose and same volume, group A and B were compared with group C respectively. RESULTS: There were 108, 118, and 113, in groups A, B, and C, respectively; and there were no significant differences with respect to the number, age, sex, and type of operation (p>0.05). The mean complete anesthetic times were 78.5, 76.4, and 58.6 minutes, respectively. The mean intraoperative VAS scores were 2.04, 0.62, and 0.24; and the mean postoperative VAS scores (6 hours/12 hours) were 2.41/4.08, 0.27/1.24, and 0.38/1.54. The mean patient's satisfactory scores were 8.53, 9.38, and 9.40, respectively. Compared with group C, group A showed significantly longer complete anesthetic time (p 0.05). Patient's satisfactory scores in both group A and B were similar to group C (p>0.05, p>0.05). There were no specific adverse reactions in all groups. CONCLUSION: Ropivacaine 0.6% as well as 0.75% are safe and effective anesthetics under the same volume (30 ml) for regional nerve block of the lower extremity. However, taking into account of the longer complete anesthetic time, the operation start time must be adjusted.

The Current Concepts of Hip Arthroscopy / 대한정형외과학회잡지

Hip arthroscopy has been useful for resolving unexplained pains of the hip joint, despite its clinical applicability came after many other joints. Surgical indications have been increasing recently. Moreover, additional surgical techniques allow both the anatomy and function to return to its normal state. Recently, the concepts and treatments for extra-articular pathologies, such as deep gluteal syndrome, ischiofemoral impingement, subspinal impingement and iliopsoas impingement as well as classic indication, such as femoroacetabular impingement, acetabular labral tear, loose bodies, and synovial osteochondromatosis have been introduced. We present a diagnosis and treatment for diverse indications of hip arthroscopy, preoperative considerations, surgical technique and postoperative rehabilitation.

Descriptive Epidemiology of Patients Undergoing Total Hip Arthroplasty in Korea with Focus on Incidence of Femoroacetabular Impingement: Single Center Study

We analyzed the causes leading to total hip arthroplasty (THA), aimed to clarify the incidence of femoroacetabular impingement (FAI) among the causes, and compared the incidence in Korea with those in other countries. From January 2000 to December 2014, 1,206 hips of 818 patients who underwent primary THA at our institute were reviewed retrospectively in terms of radiographs and electronic charts. The radiographs and radiographic parameters were reviewed and measured by 2 of the authors, who are orthopedic surgeons. Patients were categorized in terms of the causes leading to THA as primary osteoarthritis (OA), rheumatoid arthritis (RA), posttraumatic arthritis, post infectious arthritis, avascular necrosis (AVN) of the femoral head, fracture of the femoral head or neck, ankylosing spondylitis (AS), developmental dysplasia of the hip (DDH), Legg-Calvé-Perthes disease (LCPD), FAI, and others. There were 32 patients (3.91%) in the primary OA group, 41 (5.01%) in the RA group, 84 (10.27%) in the posttraumatic arthritis group, 39 (4.77%) in the post infectious arthritis group, 365 (44.62%) in the AVN group, 39 (4.77%) in the fracture group, 21 (2.57%) in the AS group, 52 (6.36%) in the DDH group, 71 (8.68%) in the LCPD group, 52 (6.36%) in the FAI group, and 22 (2.69%) in the ‘other’ group. The causes leading to THA in Korea differ from those in Western countries. FAI could be causes of severe secondary OA that requires THA in Korea, therefore symptomatic FAI should not be neglected.

Comprehensive Review of Advancements in Hip Arthroscopy / 대한고관절학회지

Hip arthroscopy is currently being leveraged in the diagnosis and treatment of a wide range of hip joint problems. In fact, great advancements in hip arthroscopy have resulted in an ever-expanding number of indications to which it is being applied. Minimally invasive hip arthroscopy allows for quicker initiation of rehabilitation and has attracted much attention as the field becomes increasingly focused on surgeries designed to preserve joints. This review aims to summarize the recent advances, applications, and impact of hip arthroscopy.

Could Patient Undergwent Surgical Treatment for Periprosthetic Femoral Fracture after Hip Arthroplasty Return to Their Status before Trauma? / 대한고관절학회지

PURPOSE: The purpose of this study was to compare preoperative clinical outcomes before occurrence of periprosthetic femoral fracture (status before trauma) with postoperative clinical outcomes (status after operation) in patients with periprosthetic femoral fracture after hip arthroplasty. MATERIALS AND METHODS: A retrospective review was performed of all periprosthetic femoral fracture after hip arthroplasty treated surgically at our institution from January 2010 to January 2014. Among 29 patients who underwent surgical treatment for periprosthetic femoral fracture after hip arthroplasty, 3 patients excluded because of non-union of the fracture site. The clinical outcomes were determined by using visual analogue scale for pain (VAS), Harris hip score (HHS), and ambulatory ability using Koval classification. VAS, HHS and ambulatory ability was assessed for all the included patients at the last follow-up of status before trauma and after operation. RESULTS: The mean VAS, HHS and ambulatory ability at the last follow-up of status before trauma was 2.2 (range, 0-4), 78.9 (range, 48-92) and 1.9 (range, 1-5), respectively. The mean VAS, HHS and ambulatory ability at the last follow-up of status after operation was 3.1 (range, 1-5), 68.4 (range, 46-81) and 2.9 (range, 2-6), respectively. The clinical outcome of VAS, HHS and ambulatory ability were significantly worsened after surgical treatment for periprosthetic femoral fracture (P=0.010, P=0.001, and P=0.002, respectively). CONCLUSION: Patients with periprosthetic femoral fracture after hip arthroplasty could not return to their status before trauma, although patients underwent appropriate surgical treatment and the fracture union achieved.

Hip Arthroscopy for Incarcerated Acetabular Labrum following Reduction of Traumatic Hip Dislocation: Three Case Reports / 대한고관절학회지

Traumatic hip fracture-dislocations are associated with chondral and labral pathology as well as loose bodies that can be incarcerated in the hip joint. Incarceration, such as interposed labrum between acetabulum and femoral head that is not readily visualized preoperatively, is a rare but important cause of pain and can potentially be a source for early degeneration and progression to osteoarthritis. We present three cases, arthroscopic surgery of incarcerated acetabular osseo-labral fragment following reduction of traumatic hip fracture-dislocation.

Descriptive Epidemiology of Symptomatic Femoroacetabular Impingement in Young Athlete: Single Center Study / 대한고관절학회지

PURPOSE: The purpose of this study was to determine the prevalence of symptomatic femoroacetabular impingement (FAI) in athletic patients. MATERIALS AND METHODS: From July 2003 to May 2013, 388 patients (422 hips) who underwent arthroscopic surgery for FAI were evaluated demographic characteristics. The patients' age, gender, diagnosis, and type of sports were analyzed using medical records and radiography. RESULTS: Among 422 hips in 388 patients, 156 hips were involved with sports. Among the 156 hips, 86, 43, and 27 hips were categorized as cam, pincer, and mixed type, respectively. Types of sports were soccer, baseball and taekwondo which showed 44, 36 and 35 hips, respectively. Also, cases related to sports according to age were 63 hips for twenties and 12 hips for teenagers in which the two showed highest association to FAI. The kinds of sports that showed high association were 28 hips of soccer and 20 cases of martial arts such as taekwondo and judo for twenties and 9 hips of martial arts for teenagers which was the highest. CONCLUSION: FAI usually occurs in young adults and is highly related to sports activity. Most of the FAI type related to sports activity was cam type, and soccer and martial arts such as taekwondo were the most common cause of it.

Ligamentum Teres Injuries of the Hip / 대한정형외과학회잡지

PURPOSE: The purpose of this study is to identify functions of ligamentum teres during multi-planar movement of the hip joint and to evaluate the correlation between arthroscopic findings and preoperative magnetic resonance imaging (MRI) of ligamentum teres rupture. MATERIALS AND METHODS: With four fresh-frozen cadavers that were dissected for removal of all soft tissue from around the hip, leaving only the ligamentum teres intact, tension of ligamentum teres at each position of the hip during multiplanar movement of the hip joint was identified. Among patients who underwent arthroscopic treatment for hip joint lesion from June 2006 to December 2012, arthroscopic findings of 26 patients who showed ligamentum teres rupture on arthroscopy were compared retrospectively with finding of preoperative MRI and visual analogue scale pain score and modified Harris hip score preoperatively and at final follow-up were evaluated. RESULTS: The ligamentum teres was maximal taut at flexion with external rotation. Ligamentum teres rupture was suspected according to preoperative MRI in 20 cases (76.9%). All cases underwent arthroscopic debridement and thermal shrinkage for the ruptured ligamentum teres. At final follow-up, visual analogue scale pain score and modified Harris hip score had improved from 6.1 (4-9) and 63.7 (36.3-86.9) to 2.0 (0-5) and 88.4 (72.6-100), respectively (all p<0.001). CONCLUSION: The ligamentum teres is maximal taut at flexion with external rotation and contributes to internal stability. Ruptured ligamentum teres should be treated by arthroscopic debridement and thermal shrinkage.

Usefulness of the Medial Portal during Hip Arthroscopy

The current conventional portals for hip arthroscopic surgery are the anterior, anterolateral, and posterolateral portals. For lesions in the medial anteroinferior or posteroinferior portion of the hip, these portals provide insufficient access to the lesion and consequently lead to incomplete treatment. Thus, in such a situation, a medial portal approach might be helpful. However, operators have avoided this procedure because of the risk of injury to the obturator, femoral neurovascular structures, and the medial femoral circumflex artery. Thus, to overcome the disadvantages of the conventional method for medial lesions of the hip, we performed a cadaveric study to evaluate the technique, usefulness, and risk of the medial portal technique.

Arthroscopic Treatment of Subchondral Bony Cyst in Early Osteoarthritis of the Hip Joint Using Allogeneic Bone Graft: A Report of Two Cases / 대한고관절학회지

Subchondral bony cyst, large solitary or multiple cysts in acetabular dome usually exacerbate progression to degenerative osteoarthritis in the hip joint. But it can be treated through arthroscopic intervention. We report two cases that treated by arthroscopic curettage and bone graft for subchondral bony cysts in early osteoarthritis of the hip joint, and it may delay progression to moderate osteoarthritis.