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Table 4 Comparison of pre- and postoperative HHS

From: Impingement-free hip range of motion after osteochondroplasty and relative neck lengthening in adults with healed Perthes disease

HHS

Paired t test

 

Range

Mean ± SD

Improvement mean ± SD

P value (significance)

Preoperative

60–73

66.5 ± 3.9

22.9 ± 8.6

< 0.0001 (ES)

Postoperative

65–100

89.4 ± 11.8

  1. SD Standard deviation, ES Extremely significant
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Journal of Orthopaedic Surgery and Research

ISSN: 1749-799X