{'fraction_non_alphanumeric': 0.0296220633299285, 'fraction_numerical': 0.03779366700715015, 'mean_word_length': 4.9393939393939394, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
[Primary Zweymuller total hip arthroplasty for osteoarthritis secondary to congenital acetabular dysplasia].

OBJECTIVE
To evaluate the effectiveness of Zweymuller prothesis in replacing osteoarthritis secondary to congenital dysplasia of the hip.


METHODS
From January 1996 to June 2000, Zweymuller prothesis was used to reconstruct 32 hips in 29 patients with congenital acetabular dysplasia(3 bilateral cases). All patients were female. According to the classification of Perner, 19 hips belonged to type I, 7 type II, 5 type III, and 1 type IV. The mean follow-up period was 27.5 months (6-53 months). The preoperative Harris hip score ranged from 25 to 59(average 44.5).


RESULTS
The pain was completely relieved, and the Harris hip score ranged from 63 to 97(average 85).


CONCLUSION
We consider that the Zweymuller total hip arthroplasty provides stable fixation of the cup in the presence of moderate acetabular dysplasia without structural bone grafting or cementing.