Clinical Orthopaedics and Related Research®

, Volume 471, Issue 7, pp 2361–2366

Comparison of the Cable Pin System With Conventional Open Surgery for Transverse Patella Fractures

  • Ningfang Mao
  • Deding Liu
  • Haijian Ni
  • Hao Tang
  • Qiulin Zhang
Clinical Research

DOI: 10.1007/s11999-013-2932-8

Cite this article as:
Mao, N., Liu, D., Ni, H. et al. Clin Orthop Relat Res (2013) 471: 2361. doi:10.1007/s11999-013-2932-8

Abstract

Background

The cable pin system is an effective device for fixation of transverse patella fractures. However, whether this device provides superior results using a minimally invasive technique instead of conventional open surgery using the K wire tension band method is unclear.

Questions/purposes

We asked whether a minimally invasive technique would be associated with (1) increased operative time; (2) reduced postoperative pain; (3) faster recovery of ROM; (4) higher knee scores; and (5) reduced complications.

Methods

Forty patients with displaced transverse fractures of the patella participated in this prospective, randomized, controlled trial. Twenty of these patients underwent a minimally invasive technique and the others had conventional open surgery using K wires. Some data for six of the 20 patients who underwent the minimally invasive technique were published in an earlier prospective, observational trial. At postoperative intervals of 1, 3, 6, 12, and 24 months, pain was measured by VAS scores, active flexion and extension of the knee were measured in degrees by goniometry, and knee function was evaluated using the Böstman clinical grading scale.

Results

Operative time was longer in the minimally invasive surgery group (54.3 ± 9.8 minutes versus 48.5 ± 6.1 minutes). Pain scores were better (lower) in the minimally invasive surgery group at 1 and 3 months but not at 6 months. Early flexion, ultimate flexion, and knee scores from 3 to 24 months, likewise, were better in the minimally invasive surgery group. Complications mostly related to symptomatic hardware were less common in the minimally invasive surgery group.

Conclusions

The minimally invasive technique is superior to conventional open surgery using K wires in terms of less early postoperative pain, better mobility angles of the injured knee, higher functional score of the injured knee, and decreased incidence of complications.

Level of Evidence

Level I, therapeutic study. See the Guidelines for Authors for a complete description of levels of evidence.

Supplementary material

11999_2013_2932_MOESM1_ESM.doc (82 kb)
Supplementary material 1 (DOC 20 kb)
11999_2013_2932_MOESM2_ESM.doc (84 kb)
Supplementary material 2 (DOC 84 kb)

Copyright information

© The Association of Bone and Joint Surgeons® 2013

Authors and Affiliations

  • Ningfang Mao
    • 1
  • Deding Liu
    • 1
  • Haijian Ni
    • 1
  • Hao Tang
    • 1
  • Qiulin Zhang
    • 1
  1. 1.Department of Orthopedics, Changhai HospitalThe Second Military Medical UniversityShanghaiPR China

Personalised recommendations