Evaluation of Four Surgical Techniques in Primary Total Hip Arthroplasty
Evaluation of Four Surgical Techniques in Primary Total Hip Arthroplasty
Current "Minimally Invasive THR" includes: (1) Minimally Invasive Two-Incision THR (MIS-2),
 (2) Minimally Invasive Modified Watson-Jones THR (MIS-WJ). In contrast, "mini-incision"
 utilizes smaller incision (< 10 cm in definition) to perform the THR which can further be
 divided into mini-anterolateral (Mini-AL) and mini-posterolateral (Mini-PL).The purpose of
 this study is to investigate how MIS THR can affect the results of THR by a prospective
 randomized clinical trial. It is hoped that some new standards could be established for the
 total hip replacement surgery.
The prospective randomized study will be performed in patients after obtaining patient's
 consent. "Envelop drawing based on random table" will decide the choice of approach. (1)
 Group 1: MIS-2, 30 cases (2) Group 2: MIS-WJ, 30 cases (3) Group 3: Mini-AL, 30 cases (4)
 Group 4: Mini-PL, 30 cases. Only the unilateral coxarthrosis will be recruited for the study.
 Analytical methods include (1) gait analysis (2) cybex study (3) balance test and obstacle
 crossing test (4) bone densitometry (5) PETS oxygen consumption and glucose utilization tests
 (6) inflammatory markers (7) clinical assessment (8) X-ray studies. Patients will be
 scheduled for specified examinations preoperatively, postoperatively and within 5 days, 2
 weeks, 6 weeks, 3 months, 6 months, 12 months, 24 months, and 36 months.
Inclusion Criteria:

 -  Unilateral hip disease that is indicated for primary total hip arthroplasty.

 Exclusion Criteria:

 -  A previous THA on the contralateral hip.

 -  Any condition contraindicated for primary total hip arthroplasty.

 -  Refuse to be randomized in the study arms.