Objective To study the clinical results of the short-arm cast immobilization leaving all the metacarpophalangeal joints free in the management of the delayed/nonunion of scaphoid fracture. Methods From August 1999 to January 2008, 18 cases of delayed/nonunion of scaphoid fracture were studied, including 2 cases with avascular necrosis in the proximal fragment and 2 cases with partial sclerosis. The average time from the injury was 6.3 months (range 2～12 months). The wrist was immobilized with a short-arm cast (from 5 cm below the elbow to the middle palmar crease), leaving all the metacarpophalangeal joints free until the fracture showed radiological signs of union. The wrist was fixed in 10 degrees of dorsiflexion and 20 degrees of ulnar deviation. All cases were reviewed every one or two months, and the cast should be changed if loose. Union of fracture was determined by plain radiograph. Results Union rate confirmed by plain radiograph was 88.9%(16 of 18) and average duration of cast was 4.7 months (range 3～8 months). Two cases with avascular necrosis in the proximal fragment achieved union after 5 and 6 months immobilization respectively. Of two failure cases of nonunion, one with partial sclerosis was immobilized for 5 months without signs of union and the other abandoned treatment after 2 months immobilization. Fourteen of the sixteen healed cases were followed up(with average of 9.3 months )after cast removal. Four cases were reported of 10 degrees dorsiflexion limitation of the wrist and three cases complained of mild pain during movement. Conclusion The delayed/nonunion of scaphoid fracture within 1 year after injury and without obvious sclerosis could achieve union with the short-arm cast immobilization leaving all the metacarpophalangeal joints free. The delayed/nonunion of scaphoid fracture with avascular necrosis in the proximal fragment need long term immobilization and also had chance of union.

Objective To summarize the clinical experience of diagnosis and arthroscopic treatment of intratment of intra ular osteoid osteoma.Methods Seven patients(average 22.4 years old with range from 11～32 years)with intra-articular Osteoid osteoma who underwent arthroscopy treatment from March 2006 to June 2009 were studied respectively.Thin-section CT scanning was used to confirm diagnosis and determine surgery location.Results The time span between the appearance of clinical symptoms and confirmed diagnosis was 26.0 months on average(range from 18 to 36 months).At a mean 19-month follow-up,all patients showed significant improvements including VAS decrease,no recurrence,pain relief and normal range of motion.Conclusion The atypical clinical features and radiographic findings of osetoid osteoma might lead to the delayed diagnosis.Using arthroscopy to remove intro-articular osteoid ostema was a safe and effective way.

Objective. To detect histological characteristic of anterior cruciate ligament (ACL) and medial collateral ligament (MCL). Methods. In each of 20 skeletally mature male mongrels and 4 men, the ACL and MCL were examined by standard hematoxylin-eosin procedure and toluidine blue staining for histologic observation. Results. The fibroblasts in medial collateral are elongated to spindle shape and aligned in a row between the bundles of collagenous fibers. Toluidine blue staining is negative. The anterior cruciate ligament demonstrated more heterogenous cell types and arrangement. It had three major cell forms:spindle, round and ovoid type, which were shorter but greater than the cells in medial collateral ligament. Toluidine blue staining was positive in anterior cruciate ligament. Most cells in anterior cruciate ligament were enclosed within lacunae. Conclusion. This study suggests that the ACL has different histological characteristics from MCL, and is more cartilage-like in nature.