Can the need for future surgery for acute traumatic anterior shoulder dislocation be predicted?

BACKGROUND: Some surgeons believe that they can identify patients who are at high risk for shoulder redislocation and that these patients are best served by immediate surgical stabilization. This natural history study was performed to examine the validity of this concept and to determine whether it is possible to predict the need for future surgery at the time of the index injury and examination. METHODS: One hundred and thirty-one patients were followed for an average of four years after their first shoulder dislocation. An extensive history was recorded and a thorough physical examination was performed on each patient. Final evaluation consisted of a physical examination, radiographic evaluation, and determination of three outcome measurements. RESULTS: Twenty-nine (22%) of the 131 patients requested surgery during the follow-up period. There were twenty Bankart repairs and nine rotator cuff repairs. Forty-three patients (33%) had at least one recurrent dislocation. Thirty-nine of these patients were in the group of ninety patients under the age of forty years. Thirty-seven of these thirty-nine patients either participated in contact or collision sports or used the arm at or above chest level in their occupation. Eighteen (49%) of these thirty-seven patients had surgery. Only two of the more sedentary patients had redislocation, and none had surgery. Four (10%) of the forty-one patients over the age of forty had a redislocation, but none required a Bankart repair. However, eight (20%) of the forty-one patients required a rotator cuff repair. Eighty-eight (67%) of the 131 patients never had a redislocation. Their outcome scores were high and equivalent to those of the cohort of patients who had had a successful Bankart repair of an unstable shoulder. Patients who had redislocation but chose to cope with the instability rather than have surgery had lower outcome scores. Twenty-two (51%) of the forty-three patients who had recurrent instability had only one redislocation during the entire follow-up period, whereas some patients had as many as twelve complete redislocations. CONCLUSIONS: Younger patients involved in contact or collision sports or who require overhead occupational use of the arm are more likely to have a redislocation of the shoulder than are their less active peers or older persons. However, even in the highest-risk groups, only approximately half of patients with shoulder redislocation requested surgery within the follow-up period. Early surgery based on the presumption of future dislocations, unhappiness, and disability cannot be justified.

Open Bankart repair: correlation of results with postoperative subscapularis function.

BACKGROUND: The potential weakness of the open Bankart procedure is the takedown and repair of the subscapularis tendon. It is not known to what extent this part of the procedure affects the final result. HYPOTHESIS: The function of the subscapularis muscle after surgery will be related to the patient's perception of surgical success. STUDY DESIGN: Cohort study; Level of evidence, 2. METHODS: A total of 30 patients with traumatic anterior instability had an open Bankart repair by a single surgeon. These patients were observed for a mean of 4 years. At final follow-up, the patients filled out 3 self-assessment forms: the American Shoulder and Elbow Surgeons scale, the Western Ontario Shoulder Instability Index, and the Constant and Murley scale. An independent physician performed a complete physical examination. Strength testing of all muscle groups was performed and compared with the opposite normal side. RESULTS: Multiple factors were related to the patient's perception of the result. Only subscapularis function was found to have a statistically significant correlation. Of the patients, 23% had an incompetent subscapularis with a mean of 27% strength as compared with the opposite side. These patients had a positive lift-off test result and reported 57% good and excellent results; only 57% would have the surgery again. Of the patients, 77% had a normal functioning subscapularis with at least 80% strength as compared with the opposite side. These patients had a negative lift-off test result and had 91% good and excellent results; 100% would have the surgery again. The Western Ontario Shoulder Instability Index was the only scale that differentiated between a patient with subscapularis function and a patient without subscapularis function. CONCLUSION: Postoperative subscapularis function was the most critical factor in determining the patient's perception of surgical success. CLINICAL RELEVANCE: It is likely that handling of the subscapularis tendon during surgery and protection of the subscapularis in the first weeks after surgery are critical to the success of the open Bankart repair.

Prospective trial of a treatment algorithm for the management of the anterior cruciate ligament-injured knee.

BACKGROUND: Specific guidelines for operative versus nonoperative management of anterior cruciate ligament injuries do not yet exist. HYPOTHESIS: Surgical risk factors can be used to indicate whether reconstruction or conservative management is best for an individual patient. STUDY DESIGN: Prospective nonrandomized controlled clinical trial; Level of evidence, 2. METHODS: Patients were classified as high, moderate, or low risk using preinjury sports participation and knee laxity measurements. Early anterior cruciate ligament reconstruction (within 3 months of injury) was recommended to high-risk patients and conservative care to low-risk patients. It was recommended that moderate-risk patients have either early reconstruction or conservative care, according to the day of presentation. Assessment of subjective outcomes, activity, physical measurements, and radiographs was performed at mean follow-up of 6.6 years. RESULTS: Early phase conservative management resulted in more late phase meniscus surgery than did early phase reconstruction at all risk levels (high risk, 25% vs 6.5%; moderate risk, 37% vs 7.7%, P = .01; low risk, 16% vs 0%). Early- and late-reconstruction patients' Tegner scores increased from presurgery to follow-up (P < .001) but did not return to preinjury levels. Early-reconstruction patients had higher rates of degenerative change on radiographs than did nonreconstruction patients (P < .05). CONCLUSIONS: Early phase reconstruction reduced late phase knee laxity, risk of symptomatic instability, and the risk of late meniscus tear and surgery. Moderate- and high-risk patients had similar rates of late phase injury and surgery. Reconstruction did not prevent the appearance of late degenerative changes on radiographs. Relationship between bone contusion on initial magnetic resonance images and the finding of degenerative changes on follow-up radiographs were not detected. The treatment algorithm used in this study was effective in predicting risk of late phase knee surgery.

The reliability and validity of knee-specific and general health instruments in assessing acute patellar dislocation outcomes.

BACKGROUND: The most reliable and valid instruments for assessing patient outcome after patellar dislocation have not been identified. HYPOTHESIS: Knee-specific and general health instruments will differ in validity and reliability for patients with patellar dislocation. STUDY DESIGN: Prospective cohort study. METHODS: Subjects consisted of 153 patients with acute patellar dislocation (110 with first-time dislocations and 43 with a history of patellofemoral subluxation or dislocation). We administered the modified International Knee Documentation Committee form, Kujala, Fulkerson, Lysholm, Tegner, Short Form 36, and Musculoskeletal Function Assessment instruments on two separate occasions (test-retest reliability). Validity was assessed by comparing scores of the two groups and by comparing scores of patients with and without recurrent subluxations/dislocations during follow-up. RESULTS: The knee-specific instruments yielded the highest test-retest reliability. The knee-specific and general health instruments identified higher disability levels in the patients with a history of patellofemoral problems than in those with first-time dislocations. The general health instruments identified higher disability levels in patients with patellar dislocation than published norms. The Fulkerson and Lysholm scales were the only instruments to differentiate between patients with and without recurrent subluxations/dislocations. CONCLUSIONS: Knee-specific scales yielded higher reliability coefficients and stronger validity than did general health instruments. Knee-specific, general health, and activity level instruments are complementary and in combination provide a more complete assessment for patients with patellar dislocation.

Epidemiology and natural history of acute patellar dislocation.

BACKGROUND: The goals of this study were to (1) define the epidemiology of acute patellar dislocation, (2) determine the risk of subsequent patellar instability episodes (subluxation and/or redislocation) during the study period, and (3) identify risk factors for subsequent instability episodes. STUDY DESIGN: Prospective cohort study. METHODS: The authors prospectively followed 189 patients for a period of 2 to 5 years. Historical data, injury mechanisms, and physical and radiographic measurements were recorded to identify potential risk factors for poor outcomes. RESULTS: Risk was highest among females 10 to 17 years old. Patients presenting with a prior history of instability were more likely to be female (P < .05) and were older than first-time dislocation patients (P < .05). Fewer first-time dislocators (17%) had episodes of instability during follow-up than patients with a previous history of instability (49%) (P < .01). After adjusting for demographics, patients with a prior history had 7 times higher odds of subsequent instability episodes during follow-up than first time dislocators (adjusted odds ratio = 6.6, P < .001). CONCLUSIONS: Patellar dislocators who present with a history of patellofemoral instability are more likely to be female, are older, and have greater risk of subsequent patellar instability episodes than first-time patellar dislocators. Risk of recurrent patellar instability episodes in either knee is much higher in this group than in first-time dislocators.

Obesity and perioperative morbidity in total hip and total knee arthroplasty patients.

The incidence of obesity in 1071 total hip arthroplasty (THA) patients and 1813 total knee arthroplasty (TKA) patients and its effect on perioperative morbidity were evaluated prospectively. Fifty-two percent of TKA and 36% of THA patients were obese (body mass index >or=30). The obese patients were significantly younger, with a higher proportion of obese TKA patients being women. Higher rates of diabetes and hypertension were found in obese patients. Higher postoperative infection rates were observed in patients with body mass index 35 or higher. The odds ratio was 6.7 times higher risk for infection in obese TKA patients and 4.2 times higher for obese THA patients. The increased risk of infection in obese patients undergoing total joint arthroplasty must be realized by both the patient and surgeon.