Replacement Arthroplasty: Li ZR

Li ZR. · No affiliation provided · Zhonghua Wai Ke Za Zhi. · Pubmed #19094553 No free full text.

This publication has no abstract.

Shi ZC, Li ZR, Sun W. · Department of Orthopedics, China-Japan Friendship Hospital, Beijing 100029, China. · Zhonghua Wai Ke Za Zhi. · Pubmed #15733451 No free full text.

Abstract: OBJECTIVE: To explore the correct localization of the acetabular component, surgical technique and the outcome in total hip arthroplasty (THA) for acetabular dysplasia with secondary osteoarthritis. METHODS: A retrospective review was undertaken of 44 hips (38 patients) that had had a total hip arthroplasty for acetabular dysplasia with secondary osteoarthritis from September.1989 to April. 2003. 14 were male (one bilateral) and 24 patients were female (5 bilateral). The mean duration of clinical and roentgenographic follow-up was thirty-six months (range, eight to one hundred and sixty-eight months), and the mean age of the patients was fifty-one years (range, twenty-nine to eighty years). Twelve hips were classified as type I; twenty-four as type II; seven as type III; and one as type IV, according to the criteria of Crowe. The horizontal location of the center of the hip (the distance along the interior drop line extending lateral or medial from the inferior point of the teardrop to the perpendicular line dropped from the center of the femoral head) was measured. RESULTS: There were 24 acetabular components that were placed in the centralized position and the other 20 in no deepen placement post-operatively. At the most recent follow-up, the mean Harris hip score was 90.2, 86.3 for the centralized position and the undeepen placement hips respectively, there was a significant difference between these two groups. CONCLUSIONS: In order to obtain the stability of acetabular component, deepen acetabular reaming is necessary for the most acetabular dysplasia in THA. In this way the anatomical rotational center can be obtained medially and lowly. The excellent long-term function will be maintained.

Shi ZC, Li ZR. · Doctorate Candidate of Clinical Medicine in the 2001 Grade, Peking Union Medical College, Beijing 100730, China. · Zhongguo Yi Xue Ke Xue Yuan Xue Bao. · Pubmed #15379274 No free full text.

Abstract: OBJECTIVE: To explore the correct localization of the acetabular component, surgical technique and the outcome in total hip arthroplasty (THA) for acetabular dysplasia with secondary osteoarthritis. METHODS: A retrospective review was undertaken of 39 hips (33 patients) that had been performed a total hip arthroplasty for acetabular dysplasia with secondary osteoanthritis from September 1989 to January 2003. These patients were divided into two groups, 16 patients (20 hips) who were performed by regular THA of Harris method were defined as group A and the other 17 patients (19 hips) by acetabular centralization technique as group B. The hip function was evaluated using Harris hip score before and after operation. The horizontal location of the center of the hip (the distance along the intertear drop line extending lateral or medial from the inferior point of the teardrop to the perpendicular line dropped from the center of the femoral head), abduction angle of the cup, and femoral offset was measured. RESULTS: At the most recent follow-up, the mean Harris hip score was 88.9 +/- 5.8, and 82.3 +/- 8.4 for the anatomical position reconstruction and the lateral displacement hips, respectively (P < 0.05). The horizontal distance between the teardrop and the hip center was significantly shorter in B group [(37.3 +/- 3.4) mm] than in A group [(46.1 +/- 5.3) mm] (P < 0.05). Two patients had bone resorption of autograft and malposition of the acetabular component during follow-up, while others had no revision, loosening, or migration of the acetabular component. CONCLUSION: Accurately confirmed acetabular position, stable acetabular component, and appropriate techniques are important to guarantee the clinical efficacy of THA.

Shi ZC, Li ZR. · Department of Orthopedics, China-Japan Friendship Hospital, Beijing 100029, China. · Zhonghua Wai Ke Za Zhi. · Pubmed #15363238 No free full text.

Abstract: OBJECTIVE: To explore the factors effecting restoring femoral offset and the relation between femoral offset and hip abductor strength during total hip arthroplasty (THA). METHODS: Ninety-nine THA for 81 patients were performed from March 1998 to January 2002. And follow-up was finished. There were 53 women and 28 men and the average age was 57 years (29 to 80). The right hip had been replaced in 28 cases, the left in 35 cases and the bilateral in 18 cases. The mean duration of clinical and roentgenographic follow-up was 36.8 months (range, 19 approximately 66 months). A posterolateral approach was used in all THA. The femoral offset and the abductor lever arm were measured from each radiograph. The measurement of the hip abduction strength was made for some THA by the Cybex machine. Statistical data analysis was performed by SPSS10.0 software. RESULTS: Femoral offset correlated positively with the length of the abductor lever arm (r = 0.613; P < 0.001). Simple regression analysis showed that femoral offset was significantly and positively related to the length of femoral neck and neck-shaft angle (r = 0.451, P = 0.001; r = 0.567, P < 0.001). There was a highly significant and positive correlation between femoral offset (and consequently abductor lever arm) and hip abductor strength (r = 0.500, P = 0.009; r = 0.477, P = 0.014). CONCLUSIONS: It is very important to template both sides of hip preoperatively for restoring femoral offset in THA. Femoral component with more anatomical neck-shaft angle will be used with the increase in the femoral neck length.