Digital radiographic evaluation of medial joint space narrowing after partial meniscectomy of bucket-handle medial meniscus tears in anterior cruciate ligament-intact knees.
BACKGROUND
Few studies exist that evaluate the effect of partial medial meniscectomy in knees with intact anterior cruciate ligaments.


OBJECTIVE
Partial meniscectomy of bucket-handle medial meniscus tears will cause joint space narrowing.


METHODS
Case series; Level of evidence, 4.


METHODS
Between 1982 and 2001, 135 patients met the study criteria of a partial medial meniscectomy, intact ligaments, no surgery to the contralateral knee, and no chondromalacia greater than grade II. Seventy-nine patients living within 150 miles of the clinic were asked to return for physical examination. Joint space narrowing was measured from the middle of the femoral condyle to the middle of the tibial plateau using digitally magnified weightbearing 45 degrees flexed posteroanterior and full-extension anteroposterior radiographs. Measurements were performed twice with the observer blinded to the previous measurements. Subjective follow-up was obtained prospectively on an annual basis with International Knee Documentation Committee and modified Noyes knee questionnaires.


RESULTS
Forty-nine patients were examined at a mean of 11.8 years postoperatively. Mean medial joint space narrowing was 1.2 +/- 0.5 mm on 45 degrees flexed posteroanterior radiograph and 0.2 +/- 0.9 mm on full-extension anteroposterior radiographs (P < .001). Four patients had 2 mm or more of joint space narrowing. Subjective surveys obtained from 95 patients showed a mean subjective score of 89.9 points. Subjective scores did not decrease through time, and there was no correlation of joint space narrowing to lower subjective scores.


CONCLUSIONS
Partial medial meniscectomy in stable knees causes only mild joint space narrowing (mean, 1.2 mm) at a mean 12-year follow-up. Digitally magnified 45 degrees flexed posteroanterior radiographs are more likely to demonstrate joint space narrowing than are full-extension anteroposterior radiographs.
Shelbourne
K Donald
KD
Shelbourne Clinic at Methodist Hospital, Indianapolis, IN, USA. tgray@aclmd.com
Dickens
Jonathan F
JF
D000293:Adolescent; D000328:Adult; D001182:Arthroscopy; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007592:Joint Diseases / Q000000981:diagnostic imaging* / Q000209:etiology / Q000473:pathology; D007718:Knee Injuries / Q000000981:diagnostic imaging / Q000601:surgery*; D007719:Knee Joint / Q000000981:diagnostic imaging* / Q000473:pathology; D008297:Male; D008592:Menisci, Tibial / Q000000981:diagnostic imaging / Q000601:surgery; D008875:Middle Aged; D011183:Postoperative Complications / Q000000981:diagnostic imaging* / Q000473:pathology; D011859:Radiography; D012421:Rupture; D000070600:Tibial Meniscus Injuries