Piriformis syndrome, a term applied to an abnormal condition of the piriformis muscle, is characterized by symptoms and signs due to sciatic nerve entrapment at the greater sciatic notch. Recently we reviewed a case of unusual low back pain, radiating to the left lower extremity with tenderness particular in the left buttock. The patient was successfully treated by sectioning the piriformis tendon. We described the clinical features of a case of piriformis syndrome and reviewed the foreign literature.
Human ; Male ; Middle Aged ; Muscular Diseases/*etiology ; Nerve Compression Syndromes/*etiology ; *Sciatic Nerve

A few of patients with lumbar disk herniation having a separation of clinical symptoms and signs and imaging features, can be found in clinic, but the traditional theory of direct mechanical compression of nerve roots by herniated nucleus pulposus can't be used to explain this abnormal protrusion of lumbar intervertebral disc. The clinical symptoms and signs of the atypical lumbar disk herniation are affected by multiple factors. The indirect mechanical compression and distraction effect of spinal nerve roots may play an important role in the occurrence of the separation, and the appearance of abnormal clinical symptoms and signs is closely related to the migration of herniated nucleus pulposus tissue, transmission of injury information in the nervous system, and the complex interactions among the nucleus pulposus, dural sac and nerve roots. Moreover,the changes of microcirculation and inflammation secondary to the herniated nucleus pulposus tissue, the hyperosteogeny in the corresponding segment of the lumbar vertebrae and the posture changes all results in a diversity of symptoms and signs in patients with lumbar intervertebral disc herniation. Besides, there exist congenital variation of lumbosacral nerve roots and vertebral bodies in some patients, and the misdiagnosis or missed diagnosis of imaging finding may occur in some cases. However, the appearance of a separation of clinical symptoms and signs and imaging examination in patients may be caused by a variety of reasons in clinic. The exact mechanism involved in the interaction among nucleus pulposus tissue, dural sac and nerve root, secondary changes of pathophysiology and biomechanics around the nucleus pulposus, the determination of lesioned responsible segments, and how to overcome the limitations of imaging all need the further researches.
Humans ; Intervertebral Disc Displacement ; complications ; diagnosis ; Lumbar Vertebrae ; Nerve Compression Syndromes ; etiology

Animals ; Callithrix ; Disease Models, Animal ; Facial Paralysis ; etiology ; Nerve Compression Syndromes ; complications

Lipofibromatous hamartoma of the nerve is a benign tumor, which affects the major nerves and their branches in the human body. It is often found in the median nerve of the hand and is commonly associated with macrodactyly, but it is rarely found in the digital nerves at the peripheral level. This tumor is often found in young adults and may go through a self- limiting course. However, operation is indicated when the tumor size is large or when the associated nerve compressive symptoms are present. We have experienced a rare case of lipofibromatous hamartoma that symmetrically involved the volar digital nerves of both index fingers on the ulnar side. With the aid of a microscope, we dissected and removed the tumor as much as possible without sacrificing the nerve. No sensory change occurred in both fingers and no sign of recurrence was observed upon follow-up.
Adipose Tissue/pathology ; Adult ; Female ; Fingers/*innervation/pathology ; Hamartoma/complications/*pathology ; Humans ; Nerve Compression Syndromes/etiology/*pathology

A 45 year old woman was diagnosed as having anteromedial radial head dislocation and distal radius fracture five months after her injury on right forearm. The radial head dislocation led to ulnar nerve compression. She had severe restriction of her elbow movements. She was treated with arthrolysis, decompression of the ulnar nerve and radial head resection. The reverse Essex Lopresti injury and radial head dislocation compressing the ulnar nerve has not been reported in English language literature to the best of our knowledge. A mechanism is proposed for the injury. In acute presentations, restoration of both the radioulnar joints should be done and neglected nature of such injury leads to suboptimal outcomes.
Female ; Humans ; Joint Dislocations ; complications ; Middle Aged ; Radius ; injuries ; Radius Fractures ; complications ; Ulna ; injuries ; Ulnar Nerve Compression Syndromes ; etiology

Bilateral suprascapular nerve entrapment syndrome is very rare. It presents with shoulder pain, weakness and atrophy of the supraspinatus and infraspinatus muscles. We present a twenty-year old man having a history of bilateral shoulder pain associated with weakness. Electromyographic studies revealed signs of a lesion that caused a neupraxic state of the left suprascapular nerve, moderate axonal loss of the right suprascapular nerve and denervation of the right suprascapular muscle. The patient was treated with physical and medical therapy. Due to worsening of the symptoms, a surgical operation was performed by the excision of the transverse scapular ligaments bilaterally. His pain, weakness and atrophy had diminished on examination six weeks later. Suprascapular nerve entrapment should be considered in patients with shoulder pain, particularly those with weakness and atrophy of the supraspinatus and infraspinatus muscles.
Adult ; *Back ; Human ; Magnetic Resonance Imaging ; Male ; Muscle Weakness/etiology/*pathology ; Muscular Atrophy/etiology/*pathology ; Nerve Compression Syndromes/complications/*pathology ; Pain/etiology/pathology ; *Shoulder

Aged ; Aged, 80 and over ; Arthroplasty ; methods ; Hip Joint ; surgery ; Hip Prosthesis ; adverse effects ; Humans ; Male ; Nerve Compression Syndromes ; etiology ; Sciatic Neuropathy ; etiology

OBJECTIVETo investigate the causes and operations for entrapment syndrome of posterior interosseous nerve caused by elbow cyst.

METHODSForm March 2005 to March 2012,5 patients with entrapment syndrome of posterior interosseous nerve caused by elbow cyst were treated with surgical excision and neurolysis including 3 males and 2 females with an average age of 50.4 years old ranging from 35 to 60 years old. The course was from 3 to 10 months with an average of 6.3 months. The main clinical symptoms were pain on the outside of the forearm. The extension muscle power of the metacarpophalangeal joints at the fingers and the wrist had decreased. The EMC showed neurogenic damage or nerve conduction slowing down. According to the functional neurological evaluation standard of British Medical Research Institute ,the motion and sensory function after nerve injury was assessed.

RESULTSPatients were followed up for 3 to 15 months with an average of 8.5 months. Wound healing in patients was good after the operations. There were no significant complications. Three patients were excellent (M4S3+) and 2 patients were good (M3S3). The hand joint function of 5 patients recovered well after operation.

CONCLUSIONThe surgical excision and neurolysis for treatment of entrapment syndrome of posterior interosseous nerve caused by elbow ganglions cyst can remove the entrapment syndrome of the posterior interosseous nerve thoroughly ,promote the neurological function recovery. According to the functional evaluation standard ,operations achieved better therapeutic effect.

Adult ; Bone Cysts ; complications ; Elbow ; innervation ; surgery ; Female ; Fingers ; physiopathology ; Humans ; Male ; Middle Aged ; Nerve Compression Syndromes ; etiology ; physiopathology ; surgery ; Wrist ; physiopathology

OBJECTIVETo evaluate the urodynamic characteristics of the chronic impairment of cauda equina caused by lumbar disk herniation.

METHODSClinical data and urodynamic parameters of 67 male patients with lumbar disk herniation were retrospectively analyzed. Lower urinary obstruction was excluded from the cohort using the Lin-PURR analysis. Patients were divided into group A (normal detrusor function), group B (detrusor underactivity) and group C (detrusor areflexia) according to the detrusor contraction function analyzed in Lin-PURR. Clinical data and urodynamic parameters were analyzed statistically between these groups.

RESULTSThe category of the detrusor contraction function had a significant effect on the urodynamic parameters. There were significant differences in the maximum flow rate (Q(max)), maximum pressure (P(max)), pressure at the maximum flow (P(det Qmax)) and post-voiding residual urine (PVR) among group A, B and C. There were significant differences in the first sensation volume of the bladder and the maximum cystometric capacity between group A and C, B and C, but no significance was found between group A and B. There was no significant difference in age, disease duration, and compliance of the bladder among 3 groups.

CONCLUSIONSUrodynamic study is important in exploring the severity of the chronic impairment of cauda equina caused by lumbar disk herniation. Detrusor areflexia and loss of bladder sensory indicate more severe degree of impairment of the cauda equine. Q(max) and PVR are helpful in early diagnosis of the chronic impairment of cauda equina.

Adult ; Aged ; Aged, 80 and over ; Cauda Equina ; Chronic Disease ; Humans ; Intervertebral Disc Displacement ; complications ; physiopathology ; Male ; Middle Aged ; Nerve Compression Syndromes ; etiology ; physiopathology ; Retrospective Studies ; Urodynamics

OBJECTIVEAlthough most of nerve injuries associated with Monteggia fracture-dislocation in children are neurapraxias and will recover spontaneously after conservative treatment, surgical exploration of the involved nerve is always required in the cases with the entrapment of posterior interosseous nerve (PIN). However, the necessity and time frame for surgical intervention for specific patterns of nerve dysfunction remains controversial. The aim of the report is to observe and understand the pathology of PIN injury associated with Monteggia fracture-dislocation in children, and to propose the possible indication for the exploration of nerve.

METHODSEight cases, six boys and two girls, with Monteggia fracture-dislocation complicated by PIN injury, managed operatively at the authors?Hospital from 2007 to 2008 were retrospectively reviewed. All the patients underwent the attempted closed reduction before they received exploration of PIN, with open reduction and internal fixation or successful closed reduction.

RESULTSThe PIN was found to be trapped acutely posterior to the radiocapitellar joint in 4 out of 5 Type III Bado's Monteggia fractures. In the remaining cases, since there were longer time intervals from injury to operation, chronic compressive changes and epineural fibrosis of radial nerve were visualized. After a microsurgical neurolysis performed, the complete recovery in the nerve function was obtained in all the cases during the follow-up.

CONCLUSIONThe findings from this study suggest that every case of type III Monteggia fracture-dislocation with decreased or absent function of muscles innervated by PIN and an irreducible radial head in children should be viewed as an indication for immediate surgical exploration of the involved nerve to exclude a potential PIN entrapment.

Female ; Fingers ; innervation ; Fracture Fixation, Internal ; Humans ; Male ; Monteggia's Fracture ; complications ; Muscle, Skeletal ; innervation ; Nerve Compression Syndromes ; etiology ; surgery ; Recovery of Function ; Retrospective Studies ; Thumb ; innervation ; Wrist ; innervation